Overload or Thermal Protection (ANSI 49)
Introduction
Overload or thermal protection protects all types of motor applications against overload currents.
Operating Principle
Overload or thermal protection is I 2 t IDMT (Inverse Definite Minimum Time):
o It incorporates the motor thermal image function.
o It can be configured as the Ir pickup and as the trip class (Class).
Tripping curve:
Ir Pickup Setting Value
The overload or thermal protection pickup (Ir) is set by using a multi-position dial.
The default Ir pickup setting value is 0.4 x In (minimum dial value).
The overload or thermal protection tripping range is 1.05–1.20 x Ir according to IEC/EN 60947-4-1 standard.
The following table shows the preset values of the adjustment dial Ir in amperes for each current rating In:
Trip Class Setting Value
The trip class (Class) is set by using an adjustment dial:
o Class 10 (default value)
The trip class corresponds to the value of the tripping time for a current of 7.2 x Ir according to IEC/EN 60947-4-1 standard.
The following table shows the value of the tripping time depending on the current in the load for all three classes:
The precision range is -20%, + 0%
Motor Thermal Image
The model representing heat rise and cooling in a motor load is constructed according to the algorithm for calculating the thermal demand, taking account of the iron and copper losses.
The following figure represents the limit curves for the iron and copper components calculated for class 20:
Thermal Memory
The trip unit uses a thermal memory function to protect the motor from overheating in case of low amplitude repetitive faults.
Electronic protection without thermal memory function does not protect against repetitive faults because the duration of each overload above the pickup setting is too short to cause tripping. However, each overload causes a temperature rise in the installation. The cumulative effect of successive overloads can overheat the system. The thermal memory function remembers and integrates the thermal heating caused by each pickup setting overrun. The thermal memory function remembers the thermal heating values for 20 minutes before or after tripping.
Example: Comparison of the heat rise calculation without thermal image (diagram A ) and with thermal image (diagram B ):
With thermal image, the trip unit adds the thermal effect of successive current pulses. Tripping occurs based on the actual thermal state of the motor.
Cooling Fan
The thermal image of the motor is calculated taking account of the fact that the motor is self-cooled (fan mounted on the shaft end).
DOCA0161EN-01
© 2020 Schneider Electric. All rights reserved.
- Site Search Search Posts Find A Forum Thread Number Threads by Name Search FAQs
- ENGINEERING.com
- Eng-Tips Forums
- Tek-Tips Forums
Join Eng-Tips ® Today!
Join your peers on the Internet's largest technical engineering professional community. It's easy to join and it's free.
Here's Why Members Love Eng-Tips Forums:
- Notification Of Responses To Questions
- Favorite Forums One Click Access
- Keyword Search Of All Posts, And More...
Register now while it's still free!
Already a member? Close this window and log in.
Join Us Close
- Introduction
- Motor Failure and Protection
- Protection of Motor Branch-Circuits
- Withstand Ratings
- Melting Alloy Overload Relays
- Automatic Reset
- Ambient-Temperature Compensated Bimetallic Overload Relays
- Thermal Overload Relay Trip Characteristics
- Phase Loss and Phase Unbalance
- Separate Mounting—Melting Alloy Overload Relays
- Replacement Melting Alloy Overload Relays for Class 8536 Starters
- Special Features for Melting Alloy Overload Relays
- NEMA Style Melting Alloy Overload Relays Dimensions
- Class 9998 Contact Units
- Class 9999 Isolated Alarm Contacts
- Class 9998 Jumper Strap Kits
- Other Features
- Class 9065 Motor Logic SSOLR Selection Tables
- NEMA Style Dimensional Diagrams
- Isolated Auxiliary Contacts
- DIN Adapter
- Lug-Lug and Lug-Extender Kits
- Remote Reset Module
- Adapted Bimetallic or SSOLR Mounting Bracket Adapter—NEMA Sizes 00–1
- TeSys™ D Solid-State Overload Relays for Type S Starters
- Communication Protocols
- Protection Functions
- Meter Functions
- Motor Control Functions
- Motor Control Modes
- Statistical and Diagnostic Functions
- Standards and Certifications
- Configuration
- LTMR Controllers
- Expansion Module
- HMI Modules
- Transformers, Senors, and Probes
- SoMove™ Software for Configuration
- Accessories for Connecting the Components
- Dimensional Diagrams (mm)
- External Reset Mechanisms — Class 9066
- Nameplate vs. NEC Full-Load Current
- Service Factor
- Motor Branch-Circuit Design
- Thermal Overload Relays
- Motor Logic Solid-State Overload Relays
- Application
- Procedure for Thermal Unit Selection
- Selecting Slow Trip Thermal Units
- Selecting Thermal Units
Procedure for Calculating the Trip Current Rating
- Calculating the Trip Current for Ambient Temperatures Other than 40 °C
- Thermal Unit Selection on an Approximate Basis—Based on Horsepower and Voltage
- Mounting the Thermal Units
For the best experience of this site, please enable Javascript for the www.productinfo.schneider-electric.com domain.
Use the selection table for the specific controller involved.
Find the minimum motor full-load current listed for the thermal unit.
Multiply that current by 1.25 (1.15 for Class 8198). The result is the trip current rating.
Determine the thermal unit selection and trip current rating for thermal units in a Class 8536 Type SCG3 Size 1 magnetic starter used to control a three-phase, 1.15 service factor motor with a full-load current of 17.0 Amperes, where the motor and controller are both located in a 40 o C (104 o F) ambient temperature.
From thermal unit Table 13 , the proper selection is B32.
The minimum motor full-load current is 16. 0 Amperes.
Trip current rating is 16.0 x 1.25= 20.0 Amperes.
Protection Level: Is the relationship between trip current rating and full-load current. Protection level, in percent, is the trip current rating divided by the motor full-load current times 100. In the example above, the protection level for the B32 thermal unit is: 20.0/17.0 x 100=118%.
National Electrical Code, Section 430-32, allows a maximum protection level of 125% for the motor in the above example.
Minimum Trip Current: Also called ultimate current, may vary from the trip current rating value, since ratings are established under standardized test conditions. Factors which influence variations include:
The number of thermal units installed
Enclosure size
Proximity to heat producing devices
Size of conductors installed
Ambient (room) temperature, and others
Except for ambient temperature-compensated overload relays, an ambient temperature higher than 40 o C would lower the trip current, and a lower temperature would increase it. This variation is not a factor in selecting thermal units for the average application, since most motor ratings are based on an ambient temperature of 40 °C, and motor capacity varies with temperature in about the same proportion as the change in trip current. Temperature-compensated relays maintain a nearly constant trip current over a wide range of ambient temperature, and are intended for use where the relay, because of its location, cannot sense changes in the motor ambient temperature.
Show QR code for this page
Was this helpful?
Contact Information
Legal information.
The information provided in this document contains general descriptions, technical characteristics and/or recommendations related to products/solutions.
This document is not intended as a substitute for a detailed study or operational and site-specific development or schematic plan. It is not to be used for determining suitability or reliability of the products/solutions for specific user applications. It is the duty of any such user to perform or have any professional expert of its choice (integrator, specifier or the like) perform the appropriate and comprehensive risk analysis, evaluation and testing of the products/solutions with respect to the relevant specific application or use thereof.
The Schneider Electric brand and any trademarks of Schneider Electric SE and its subsidiaries referred to in this document are the property of Schneider Electric SE or its subsidiaries. All other brands may be trademarks of their respective owner.
This document and its content are protected under applicable copyright laws and provided for informative use only. No part of this document may be reproduced or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise), for any purpose, without the prior written permission of Schneider Electric.
Schneider Electric does not grant any right or license for commercial use of the document or its content, except for a non-exclusive and personal license to consult it on an "as is" basis.
Schneider Electric reserves the right to make changes or updates with respect to or in the content of this document or the format thereof, at any time without notice.
To the extent permitted by applicable law, no responsibility or liability is assumed by Schneider Electric and its subsidiaries for any errors or omissions in the informational content of this document, as well as any non-intended use or misuse of the content thereof.
© 2019 – 2021 Schneider Electric.
Learning Electrical Engineering
Tools, Reference Materials, Resources and Basic Information for Learning Electrical Engineering
Insulation Classes for Electric Motors
You may also like:.
Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!
NEMA A, B, C and D Electrical Motor Design
Nema has established the four different designs a, b, c and d for electrical induction motors..
Different motors with the same nominal horsepower may have different start current, torque curves, speeds and other variables. When selection a particular motor for an intended task all engineering parameters must be taken into account.
The four NEMA (National Electrical Manufacturers Association) designs have unique speed-torque-slip relationships - making them suited for different type of applications.
NEMA design A
- maximum 5% slip
- high to medium starting current
- normal locked rotor torque
- normal breakdown torque
- suited for a broad variety of applications - like fans and pumps
NEMA design B
- low starting current
- high locked rotor torque
- suited for a broad variety of applications with normal starting torques - common in HVAC application with fans, blowers and pumps
NEMA design C
- suited for equipment with high inertia and high starting torques at start - like positive displacement pumps, conveyors
NEMA design D
- maximum 5-13% slip
- very high locked rotor torque
- suited for equipment with very high inertia starts - like cranes, hoists etc.
Related Topics
Related documents, electric motors - efficiency, electric motors - iec and nema standard torques, electrical induction motors - slip, electrical induction motors - torque vs. speed, electrical motors - frame dimensions, electrical motors - nema frame assignments, electrical motors efficiency ratings, nema - national electrical manufacturers association, three-phase electrical motors - power vs. amps and voltage.
Search is the most efficient way to navigate the Engineering ToolBox.
- Popular internal searches in the Engineering ToolBox
Engineering ToolBox - SketchUp Extension - Online 3D modeling!
Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !
Translate this Page
Translate this page to Your Own Language .
Privacy Policy
We don't collect information from our users. More about
- the Engineering ToolBox Privacy Policy
We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here .
You can change your privacy settings by clicking the following button: Manage Consent .
Advertise in the ToolBox
If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. You can target the Engineering ToolBox by using AdWords Managed Placements.
This page can be cited as
- The Engineering ToolBox (2004). NEMA A, B, C and D Electrical Motor Design . [online] Available at: https://www.engineeringtoolbox.com/nema-a-b-c-d-design-d_650.html [Accessed Day Month Year].
Modify the access date according your visit.
- Air Psychrometrics
- Drawing Tools
- Environment
- Fluid Mechanics
- Gases and Compressed Air
- HVAC Systems
- Hydraulics and Pneumatics
- Material Properties
- Mathematics
- Miscellaneous
- Piping Systems
- Process Control Systems
- Sanitary Drainage Systems
- Standard Organizations
- Steam and Condensate
- Thermodynamics
- Water Systems
Unit Converter
Temperature o C K o F
Length m km in ft yards miles naut miles
Area m 2 km 2 in 2 ft 2 miles 2 acres
Volume m 3 liters in 3 ft 3 us gal
Weight kg f N lbf
Velocity m/s km/h ft/min ft/s mph knots
Pressure Pa bar mm H 2 O kg/cm 2 psi inches H 2 O
Flow m 3 /s m 3 /h US gpm cfm
Make Shortcut to Home Screen?
Class B vs. Class C RV: Choosing the Perfect Motorhome for Your Adventures
Choosing the perfect motorhome for your adventures requires understanding the differences between class B and class C RVs. Both classes offer unique features and benefits, catering to different lifestyles and travel preferences. In this article, we’ll explore the key characteristics of class B and class C RVs, helping you determine which is the best fit for your needs.
Understanding Class B RVs
Class B RVs, also known as camper vans or Sprinter vans, are compact and versatile motorhomes built on an automotive van chassis. These RVs are designed to provide a comfortable living space within the confines of the van without the addition of external walls. Class B RVs are perfect for outdoor enthusiasts and solo or couple travelers who prioritize maneuverability and easy driving.
One of the standout features of class B RVs is their compact size. They typically range from 18 to 24 feet in length. This makes them easy to navigate through narrow roads and crowded cities, and they can even fit in conventional parking spaces. Despite their small size, class B RVs are cleverly designed to maximize living space, with ingenious solutions for kitchens, bedrooms, and storage.
Popular class B RV models, such as the Tellaro, offer a range of floor plans to suit different preferences. The Tellaro comes equipped with modern amenities, such as a 7-inch touch-screen dash radio with Apple CarPlay and Android Auto, a Winegard ConnecT 2.0 Wi-Fi extender, and a 24-inch swivel TV for outdoor viewing.
Understanding Class C RVs
Class C RVs are mid-range motorhomes built on a cab or cut-away chassis. They feature a distinctive “cab-over” profile, with a sleeping area or storage space above the cab. Class C RVs offer more living space and amenities than class B RVs, making them suitable for families and long trips.
Ranging from 22 to 33 feet in length, class C RVs provide ample room for kitchens, bathrooms, and separate sleeping areas. The added space also allows for larger storage bays, making it easier to bring along gear and supplies for extended adventures. Class C RVs may be more intimidating to drive than class B RVs, but they’re still relatively easy to maneuver compared to larger class A motorhomes.
Models such as the Four Winds class C RV offer a variety of floor plans to accommodate different family sizes and preferences. Built on either a Ford E-Series or Chevrolet chassis, the Four Winds provides a comfortable driving experience with features such as cruise control, backup monitors, and leatherette captain’s chairs.
Drivability
When it comes to drivability, class B RVs have a clear advantage. Their compact size and automotive van platform make driving stress-free, even for those who are new to RVing. Navigating through tight spaces, such as gas stations or campgrounds, is a breeze with a class B RV. Their smaller size also allows for easier parking in regular spots, eliminating the need to locate special RV parking areas.
Class C RVs, while larger than class B RVs, are still relatively easy to drive compared to massive class A motorhomes. Their increased size and weight may require more attention and caution when maneuvering, especially in windy conditions or on narrow roads. Many class C RVs come equipped with reverse cameras and power steering to enhance the driving experience.
Floor Plans and Living Spaces
Due to their compact size, class B RVs often feature innovative designs that maximize living space. Their floor plans may include convertible sleeping areas, fold-away tables, and multi-functional furniture to make the most of the available square footage.
With their larger size, class C RVs offer more traditional floor plans with dedicated living areas, kitchens, and sleeping quarters. Many models feature over-cab sleeping areas, which can be perfect for children or additional guests. The increased space in class C RVs also allows for more storage options, such as larger closets and exterior storage bays.
We recommend class C RVs due to their affordability, ample living space, and ease of driving. At Bretz RV & Marine, we have class C motorhomes for sale in Montana and Idaho with unique floor plans, diverse features, and amenities to suit your needs.
Features and Amenities
Class B RVs are often tailored to the needs of outdoor enthusiasts and adventure-seekers. Class C RVs are designed with family-friendly features in mind. The larger living spaces and sleeping capacities make them ideal for families or groups traveling together. Class C RVs often include full kitchens, spacious bathrooms, and entertainment systems to provide a comfortable home-away-from-home experience.
Fuel Efficiency and Costs
Fuel efficiency is an important consideration when choosing between a class B and class C RV. Due to their smaller size and lighter weight, class B RVs generally offer better fuel economy than class C RVs. This can result in significant savings on fuel costs over time, especially for long-distance or extended trips.
Class C RVs, while less fuel-efficient than class B motorhomes, still offer reasonable gas mileage for their size. The impact of the larger size and weight on fuel consumption can be mitigated by choosing a model with a more efficient engine or adopting fuel-saving driving habits.
In terms of maintenance and ownership costs, class B RVs may have an advantage due to their simpler design and smaller size. Both classes of RVs require regular maintenance, including oil changes, tire rotations, and system check-ups, to ensure optimal performance and longevity.
Motorhome Tips and Advice
When deciding between a class B and class C RV, it’s essential to consider your lifestyle and travel preferences. Because of their compact size, class B RVs are ideal for solo travelers, couples, or those who prioritize outdoor activities and adventure. Class C RVs are better suited for families or groups who value more living space and amenities. The separate sleeping areas and larger kitchens make them perfect for longer trips or for those who prefer a more comfortable and home-like environment while on the road.
Make the Right Choice at Bretz RV & Marine
It’s always a good idea to test-drive different models and explore various floor plans before making a decision. Attend RV shows, visit dealerships, and talk to experienced RV owners to gather insights.
Our team at Bretz RV & Marine can help you choose the perfect motorhome for your lifestyle. For more information or to browse available models, check out our RV inventory . If you’re interested in purchasing a boat for your outdoor adventures, we have a selection of boats for sale . And for tips and advice on RV ownership and travel, explore the helpful resources on our website.
The Wayward Home
8 Amazing Bunkhouse RV Floor Plans for a Family-Style Adventure
Posted: May 18, 2024 | Last updated: May 18, 2024
When choosing an RV, one of the most critical elements to pay attention to is the economy of space. Since your living quarters are going to be compact, you want to ensure that every inch is utilized so that you can still have the comfort of home.
A bunkhouse camper is one type of RV with maximum living space.
This term refers to any RV that utilizes a bunk bed style, meaning that these rigs can often sleep more individuals than other similar-sized RVs. So, if you’re interested in getting an RV with bunk beds, you’re in luck.
We’ve scoured the internet to find the best bunkhouse campers in this class, so you don’t have to.
To help you make an informed decision, we’ve broken down our list by category. Bunkhouse RVs can be Class A, Class C, travel trailers, and fifth wheels.
1. Winnebago Forza 38W
- Length: 39′ 10″
- Height: 12′
- Accommodations: Slide Out, Overhead Bunk Bed, Master Bedroom, Fireplace, Exterior TVs, Massive Storage Space
When it comes to bunkhouse floor plans, Winnebago is like the Cadillac of the industry.
The Forza 38W is one of the biggest and classiest bunkhouse RV models we’ve seen, thanks to its luxury accommodations and chic styling. There’s a reason why this bunkhouse RV costs as much as a house – because it’s practically a house on wheels.
As far as bunks go in this RV with bunk beds, there is an optional model that sits above the cabin. Best of all, there are adjacent plugins so that whoever sleeps up there can still charge their phone or use a nightlight if necessary.
Other highlights of this bunkhouse camper include ample undercarriage storage space, convertible sofa beds, a massive entertainment center (complete with fireplace), and a master bedroom that rivals most homes.
1. Thor Motor Coach Challenger
- Length: 38′ 11″
- Height: 12′ 11″
- Accommodations: Tilting King Bed, Drop-Down Overhead Bunk, Dual Bunk Beds, Two Showers, Optional Theater Seating
With a name like Thor, you know that this bunkhouse camper is going to be big. At almost 39 feet long and 13 feet tall, this is a monster rig that will impress anyone who sees it.
When talking about bunks, this bunkhouse camper comes with three. There are two bunk beds along the side, complete with mattresses and a closing door.
There is also an overhead bunk above the cabin in this bunkhouse RV, which also comes with a mattress and ladder. Best of all, the overhead bunk is powered, so all you have to do is press a button and watch it unfold.
As far as other features go, this bunkhouse camper doesn’t quite have as many accouterments as the Forza, but it feels spacious and looks modernly stylish.
You don’t get a fireplace, but you get everything else you need, and with so many options for sleeping, this bunkhouse RV is perfect for family trips. The master bed even lifts so that you can find the right position to watch TV or sleep.
3. Gulf Stream Conquest
- Length: 32′
- Height: 11′ 3″
- Accommodations: Overhead Bunk, Dual Bunk Beds, Jack Knife Sofa, Half Circle Dinette, Hardwood Styling
If you like the idea of driving your bunkhouse RV but don’t want a supersized rig, Class C models like this one from Gulf Stream are the perfect option if you’re in the market for a bunkhouse camper.
As a rule, Class C RVs come with an overhead bunk that sits above the cab.
However, if you want extra sleeping space, you can get a bunkhouse RV model like the 63111, which comes with two additional bunk beds.
Although this rig is smaller than something like the Forza, it can still sleep at least six passengers or more, depending on how comfortable everyone is with each other.
4. Coachmen Freelander
- Length: 32′ 11″
- Height: 10′ 11″
- Accommodations: U-shaped dinette, Overhead Bunk, Lift TV, Faux-Marble Countertops, Master Bedroom, Sofa or Recliners, Built-In Awning
Sometimes, you just need to have options. Fortunately, the Freelander series from Coachmen is perfect for those with discerning tastes. Although we’re featuring the 31MB model, this bunkhouse RV series has 20 different floorplans. Thanks to the overhead bunk above the cab, all of them are considered bunkhouse camper models.
So, feel free to scope out all of the unique combinations until you find the one that works best for your needs.
Beyond the overhead bunk, the Freelander is a relatively efficient and straightforward RV with bunk beds. It doesn’t have many bells and whistles, but it comes with all of the creature comforts of home.
One element that we like about the 31MB is that you can choose to get a sofa or two recliners.
If your travel plans only involve you and a partner, the recliners give each of you maximum relaxation, including a plush middle armrest with individual cup holders.
5. Keystone Passport
- Length: 26′ 3″
- Height: 11′
- Accommodations: Dual Bunks, Pass-Through Storage, Flip-Up Bunk, Outside Kitchen and Refrigerator, U-Shaped Dinette, Rear Cargo Door
A bunkhouse travel trailer can be an excellent option for those who prefer to tow their RV with bunk beds instead of driving it. One of the primary benefits of a travel trailer is that they are relatively light while still offering plenty of interior space and accommodations.
In this case, we have the Passport GT series, which has several bunkhouse camper models. However, for the money, we recommend the 2820BHWE, thanks to its double bunk beds and sleek layout.
This bunkhouse travel trailer is also a slide-out model, meaning that you can extend the side of the rig to give you more space inside. The section that slides out is the dinette, which can come with optional theater seating if you prefer.
6. Jayco Jay Feather
- Accommodations: Dual Bunk Beds, Jackknife Sofa, U-shaped dinette, Exterior Kitchen, Pass-Through Storage, Built-In 21-inch Awning
Because there are so many bunkhouse camper models on the market, it can be overwhelming to try and find the right one for your needs. However, to make it easier on yourself, you could look for bunkhouse travel trailers that come with high marks.
The Jay Feather 27BHB is a new model from Jayco, and it has already received the Top RV Debut Award in 2020. When looking at the features and interior, it’s easy to see why.
This bunkhouse trailer has dual bunk beds in the back that can support up to 600 pounds each. Below the bottom bunk is additional storage, and each bunk has its own curtain to provide some privacy.
The Jay Feather is another slide-out model, with the sofa and dinette section extending to give you more room to move around.
7. Coachmen Chaparral
- Length: 42′ 6″
- Width: 96″
- Accommodations: Dual Bunk Bed, Flip Down Bunk Bed, Theater Seating, Master Bedroom, Slide Out Dinette and Kitchen, Two Bathrooms, Tri-Fold Sofa, Exterior Kitchen
When it comes to RV trailers, fifth wheels are the Class A version. Models like the Chaparral are the ultimate in space and luxury, rivaling the top-tier Class A motorhomes.
At 42 feet long, this is a massive bunkhouse RV, which can make it hard to tow. However, once you get where you’re going, you can set up the Chaparral and live in style.
Inside, you’ll notice that there is more than enough room for a family of four or five to stay comfortably.
8. Keystone Avalanche
- Length: 41′ 7″
- Height: 13′ 4″
- Accommodations: Loft Bunkhouse, Fireplace, Theater Seating, Two Fold-Out Sofas, Two Bathrooms, Kitchen Island, Two Entertainment Centers, Master Bedroom
For our final bunkhouse camper, we have the creme de la creme of fifth wheels. Although this rig is not as long as the Chaparral, it maximizes its space in the best ways possible.
First of all, there are two of everything – bathrooms, sofas, recliners, kitchens, and bunks. The bunk beds are loft-style, meaning that they sit above the second entertainment center.
However, you can sleep eight people comfortably in this bunkhouse RV because both sofas also convert into beds. So, if you’re planning a camping trip with your extended family, the Avalanche has you covered.
Other highlights of this bunkhouse RV include a fireplace, a kitchen island (complete with sink), hardwood accents, space for a washer and dryer in the master bedroom, and an outside kitchen/prep area.
There is almost nothing you can’t do with this bunkhouse camper.
We hope that you’ve enjoyed this tour of the best bunkhouse campers. Having bunk beds makes it easy to travel in groups, and these rigs are sure to make your next trip a delight. See you on the road!
More Articles from The Wayward Home
- 8 Spacious RVs That Can Fit an Entire Extended Family
- 12 Best Family-Friendly Campers for Outdoor Adventures
22 Tiny Campers That Pack a Punch for Epic Road Trips
Tired of the tent-pitching hassle, dragging cooking gear around, misplacing tent pegs, and the discomfort of sleeping on the ground? Ever glanced at a luxurious RV and thought, “That’d be nice, but without the big price tag and complex upkeep?” Welcome to the world of micro campers!
These compact wonders are easy to tow, set up in a snap, and won’t break the bank. Plus, they’re usually small enough to tuck away in your garage.
- Read More: 22 Tiny Campers That Pack a Punch for Epic Road Trips
11 Best Small RVs That Are Perfect for Couples’ Adventures
Embracing life in a small RV comes with a heap of perks! You’ll find them a breeze to park and navigate, not to mention the lighter hit on your fuel budget.
The market is bustling with options for compact RVs, ranging from sleek Class B campervans to the slightly roomier Class B Plus and Class C models.
The best part? These pint-sized campers pack in all the essentials you’d expect in their larger counterparts – from climate control to wet baths, cooking facilities, and beyond. It’s all about big adventures in small packages!
- Read More: 11 Best Small RVs That Are Perfect for Couples’ Adventures
More for You
Jessica Biel defends her 20-pound Epsom salt bath before Met Gala
7 weird jobs that are well-paying but nobody knows about, according to a viral Reddit thread
Putin Ally Vows Two NATO Capital Cities 'Will Also Be Ours'
Every James Bond Actor, Ranked
Richard Gere and Uma Thurman arrive at the 2024 Cannes Film Festival premiere of 'Oh Canada'
It’s time to bring back the world’s greatest fighter jet – from the 1990s
Top 10 Times Howard was the Best on The Big Bang Theory
37 high-paying jobs for people who don't like stress
Social Security COLA Increase Slammed as New Estimate Released
Gold and copper are breaking records. Silver is at an 11-year high. But the narratives vary.
Meryl Streep’s favorite love scene was with Robert Redford, admits she ‘didn't want it to end'
The Big Problem With Hertz's Used Teslas
“The Good Doctor” cast says goodbye ahead of finale: 'The legacy of the show will be hope and heart'
New 'Dream Team'? USA basketball unveils 2024 Paris Olympics roster
Noodle Recall As Warning Issued To Four States
The highest-paying job in America you can get without a degree—plus, see the rest of the top 50
Mike Pompeo warns 'something doesn't sound right' about attempted Quantico breach
"Today" Host Craig Melvin Opens up About His New Career Move
'SNL' star Chloe Fineman to critics of her Cannes look: 'No need to be so mean'
Avoid Buying These 5 Electric Vehicles That Will Likely Break Down After 50,000 Miles
- Get custom product tools and services
- Access training
- Manage support cases
- Create and manage your orders (authorised partners only)
Welcome to the Schneider Electric Website
Search FAQs
What does the trip class 10, class 20 and class 30 mean for overload relays.
Article available in these languages: Czech , Spanish , Hungarian , Romanian
Released for: Schneider Electric Australia
Discuss this topic with experts
Start here!
Find answers now. Search for a solution on your own, or connect with one of our experts.
Contact Support
Reach out to our customer support team to receive more information, technical support, assistance with complaints and more.
Where to buy?
Easily find the nearest Schneider Electric distributor in your location.
Search topic-related frequently asked questions to find answers you need.
Contact Sales
Start your sales enquiry online and an expert will connect with you.
COMMENTS
Trip classes according to NEMA. NEMA Standard MG-1 defines 4 types of Classes. The most common classes are 5, 10, 20 & 30. Class 5, 10, 20 & 30 overload relays will trip within 5, 10, 20 & 30 seconds respectively at 600% of motor full load amps. A Class 10 overload relay, for example, has to trip the motor offline in 10 seconds or less at 600% ...
Motor Trip Classes. The time for which the OL should pause before reacting will be different for various motors and applications is called the motor trip class. The most common trip classes are 5, 10, 20, and 30, which refer to the number of seconds for which the OL will allow this 600% current in-rush. Applications for each of these trip ...
The trip class corresponds to the value of the tripping time for a current of 7.2 x Ir according to IEC/EN 60947-4-1 standard. ... The model representing heat rise and cooling in a motor load is constructed according to the algorithm for calculating the thermal demand, taking account of the iron and copper losses. ...
Overload relay displaying the 'Class 10' rating. Image used courtesy of Grainger, device made by Siemens . Motor Overload Relays. Now that we understand trip curves, the idea of an overload trip class is quite similar. Overload trip classes appear most often as class 10, 20, or 30. These numbers relate to the number of seconds that the ...
The most common trip classes are Class 10, Class 20, and Class 30. A Class 10 overload relay, for example, has to trip the motor offline in 10 seconds or less at 600% of the full load amps (which is usually sufficient time for the motor to reach full speed). Many industrial loads, particularly high inertia loads, require Class 30.
Issue: Meaning of Trip Classes for overload relays. Product Line: NEMA Overload Relays Environment: North American Products Resolution: The trip class means that at 600% (6 times) of the maximum thermal current rating (or 600% of the actual dial setting on adjustable overloads) the Class 10 will trip in 10 seconds or less, Class 20 will trip in 20 seconds or less, and Class 30 will trip in 30 ...
Quite often we here of applications in which the motor protection/overload relay 'trips' during normal motor starting. The remedial action taken by many when faced with this problem is to select and install a replacement overload relay, generally one that provides a higher 'Trip Class' setting, for example, Trip Class 20 in lieu of the standard Trip Class 10.
The motor trip current does not determine the choice of trip class. Trip class specifies the length of time it will take for the relay to open in an overload condition. Classes 5, 10, 20 & 30 are the most common. Class 5, 10, 20 & 30 overload relays will trip within 5, 10, 20 & 30 seconds respectively at 600% of motor full load amps. Class 5 is ...
The trip class determines the trip curve of the thermal protection device for a motor feeder. The standard defines trip classes 5, 10, 20, and 30. These classes are the maximum durations, in seconds, for motor starting with a starting current of 7.2 x Ir, where Ir is the thermal setting indicated on the motor rating plate.
Adjustable trip classes: IEC: 10A NEMA: 10, 20, 30 (GF Version has 10 & 20 only) Selectable (ON/OFF) phase and ground fault protection. Electronic remote reset 24 vdc, 24 vac, or 120 vac input. Trip/test button. Manual reset button. Isolated 1 NO / 1 NC Aux contacts. Trip flag. Freedom NEMA: C440 electronic overload relay
Tripping classes of the thermal overload relays Standard tripping classes are 10 A, 10, 20, 30. The tripping class indicates according to IEC 60947-4-1 the maximum tripping time in seconds under specified conditions of test at 7.2 times the setting current and specifics tripping and non trip-ping times for 1.5 and 7.2 times the setting current.
5 5 Special circuits ensure motor starts off load Loaded Compressor 10 12 Some compressor systems can be difficult to start Off load Mixer 5 5 No material in basin, off load Heavy Mixer 20 12 Material in basin Trip Class table * The basic guide for the DFE-30 to DFE-38 is available as part No. M-7A87-F . DFE-04 DFE-06 DFE-08 DFE-12 DFE-14 DFE ...
Determine the thermal unit selection and trip current rating for thermal units in a Class 8536 Type SCG3 Size 1 magnetic starter used to control a three-phase, 1.15 service factor motor with a full-load current of 17.0 Amperes, where the motor and controller are both located in a 40 o C (104 o F) ambient temperature.
Selectable trip class (10A, 10, 20, 30) Direct mounting to NEMA, IEC, and DP contactors Most compact electronic overload in its class Motor Control Two B600 alarm (NO) and fault (NC) contacts Test/Trip button Motor Protection Thermal overload Phase loss Selectable (ON/OFF) phase unbalance Selectable (ON/OFF) ground fault User Interface
Location. San Francisco Bay Area, CA, USA. Occupation. Electrical Engineer. Nov 14, 2018. #3. The "Class" number is, to make it simple, the amount of time it will take to trip at Locked Rotor Current of 600% of the setting. So Class 10 is 10 seconds, Class 20 is 20 seconds, Class 30 is 30 seconds.
Ideal Applications. Protects against single phasing during start-up and run-time in motor applications. Detects incorrect phase sequence to keep the motor from starting. Detects no-load conditions indicating absence of water in water lubricated pumps. Protects motors from over temperature conditions.
Each insulation class has a margin allowed to compensate for the motor's hot spot. The hot-spot is a point at the center of the motor's windings where the temperature is higher. As can be seen from the above table, hot-spot over temperature allowance for A, B, F and H are respectively 5 °C, 10 °C, 10 °C and 15 °C
NEMA has established the four different designs A, B, C and D for electrical induction motors. Different motors with the same nominal horsepower may have different start current, torque curves, speeds and other variables. When selection a particular motor for an intended task all engineering parameters must be taken into account.
RV Trip Planning made easy with unbiased data & best-in-class features. Save time, plan RV Safe Routes, and find great campgrounds. Try the FREE demo today.
Class C RVs offer more living space and amenities than class B RVs, making them suitable for families and long trips. Ranging from 22 to 33 feet in length, class C RVs provide ample room for kitchens, bathrooms, and separate sleeping areas. ... Models such as the Four Winds class C RV offer a variety of floor plans to accommodate different ...
On average, we got 25 mpg during our trip according to the trip computer, a good number given its 3.5-liter V-6 twin-turbo, which matches the EPA highway estimate, though trip computers are often ...
Class C motorhomes come in both gasoline and diesel-powered options. Keep in mind that gasoline-powered Class C RVs are usually cheaper, but diesel-powered Class C's are typically more fuel efficient. We have tons of great Class C options for you right here on RV Trader. New or used - we'll have a perfect fit for your RVing needs!
When it comes to RV trailers, fifth wheels are the Class A version. Models like the Chaparral are the ultimate in space and luxury, rivaling the top-tier Class A motorhomes.
Moscow, along with nearby Coeur d'Alene, is one of the largest communities in the Idaho panhandle.It's primarily known as the home of the state's flagship university, the University of Idaho. It's also just across the state line from the town of Pullman, which hosts Washington State University, making the Moscow-Pullman region a hub of education in the Pacific Northwest.
Coachmen RV Freelander 21QB Chevy 4500. Sleeps 5 23.0 ft. 70.8 miles from Moscow, ID. (6) $207 /night. 2008 Class A Motor Home.
Issue: Meaning of Trip Classes for overload relays. Product Line: NEMA Overload Relays Environment: North American Products Resolution: The trip class means that at 600% (6 times) of the maximum thermal current rating (or 600% of the actual dial setting on adjustable overloads) the Class 10 will trip in 10 seconds or less, Class 20 will trip in 20 seconds or less, and Class 30 will trip in 30 ...
Offering quality escorted motor-coach tours since 1992, specializing in countries of the former Eastern Europe. Featuring first class and deluxe hotels, modern air conditioned buses, highly skilled drivers and superb Tour Directors that will handle all aspects of your trip, leaving you to simply sit back and enjoy!