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Circuit Breaker Under Voltage Release – How Does It Work?

Under voltage release.

An under voltage release is an optional device installed in a circuit breaker that automatically triggers a power trip when the power falls below a preset level, usually between 70 and 35 percent of the UV rating. The circuit breaker does not power it. Instead, it receives its power from an alternative source, such as a battery. It was initially designed for use in coal mines but can now be found in any field employing heavy industry.

How it works

An  under voltage release device  consists of a solenoid magnet with a moving armature fixed to a spring-loaded latch. This latch restrains a spring-biased plunger, which when released, makes contact with the breaker trip bar to trip the breaker.

As long as the voltage connected to the solenoid magnet remains normal, the magnetic force is strong enough to overcome the spring force and keep the trip bar from releasing. But once the voltage cuts off or falls too far below the preset level, the spring force overcomes the magnetic force. This force unlatches the plunger, which then trips the power.

When the circuit breaker contacts are open, a mechanical reset leaver, powered by a central contact arm, holds the solenoid magnet in a sealed-in position. Once power is restored, the magnet reenergizes and holds the plunger in its position allowing the circuit breaker to be reset and turned back on. If the power has not been restored to the solenoid coil and someone tries to reset the breaker, it will only trip again.

It can be mounted on either the left or right pole and installed next to the operating system of a circuit breaker case. Although attached to the trip unit, the spring-loaded release extends through a knockout in the trip unit case. When installed, it won’t interfere with the standard tripping action of a circuit breaker when it experiences a power surge.

The under-voltage release is available for both AC and DC usage with several different voltage ratings to choose. Connections for a UVR come in four different forms. The standard is pigtail leads (18 inches long minimum), exiting the rear of the base directly behind the UVR. These leads are color coded for identification.

Other configurations available include a terminal block mounted on the same side of the base as the accessory. Another has leads exiting the same side of the base as the accessory. The fourth version has leads coming out on the opposite side of the accessory.

Difference between Shunt Trips

A similar appliance that can be combined with a UVR in a circuit breaker is called a  Shunt Trip . It has a similar design and function to a UVR, but is instead activated when there is a power outage. Remote control can enable it, but the solenoid coil only carries a temporary charge and is not rated for continuous use.

Eaton’s Under-Voltage Releases

Although UVR’s are not required by law in most cases, they are still recommended. When sensitive equipment is in use, an under-voltage, such as in brownouts, can cause data loss or fry the entire system. The other danger is one of safety; some industrial equipment can be a safety concern if the power dips below its required level.

Eaton’s under-voltage releases are designed to provide the protection needed for electrical systems with a compact design that is easy to install. They have both terminal magnetic and electronic magnetic units available, as well as a host of other accessories.

Eaton has been working in the industry for many years and continues to produce reliable electrical appliances for both commercial and residential use. Their high level of quality control and commitment to safety make Eaton one of the best brands in electronic devices.

Eaton – UVH4RP03K

The G series is designed for all circuit protection needs around the world. These are factory sealed and must be installed onsite. This high-performance UVR can be used for both regional and industry requirements.

Its compact design allows it to be installed easily while still leaving plenty of panel space. It has a left pole mount and a voltage rating from 525 to 600 VAC. Along with built-in ground fault protection, this makes it one of the best UVR’s for EG and JG circuit breakers.

Eaton – 1228C76G03

This  classic UVR  is made for standard MARK 75 mining service use, with a 120V LAMH electrical reset under-voltage release. This UVR is popular for its reliability and ease of use in factory settings, making it a prime choice in the mining industry.

Series C Eaton-Cutler Hammer 1373D62G09

This 50Hz  under-voltage release  has a 240V release mechanism and is designed for use with GD breaker parts and accessories.

Eaton Circuit Breaker under voltage release mechanisms are popular due to their high quality and reliability, whether for commercial or residential use. They’re easy to install and have a high safety record across all appliances.

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Reference: 325_441954789

Manufacturer: Square D (Schneider Electric)

EAN13: 3606480018992

Condition: New Factory Sealed - Original product -12 Months Warranty

undervoltage release MN - 24 V DC

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Undervoltage release (MN), TeSys GV3, 110V AC 50Hz

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Masterpact Shunt Close (XF), Shunt Trip (MX) and Undervoltage Release (MN) Accessories

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Masterpact MTZ2/MTZ3 Operating Accessories

The shunt close (XF), shunt trip (MX), and undervoltage release (MN) are optional accessories mounted inside the device. They can be of standard type or diagnostic and communicating type (standard or with diagnostic function for the undervoltage release [MN]).

The standard XF, MX, and MN accessories can have either impulse-type or maintained actions, depending on the incoming commands.

The Masterpact shunt close (XF) is available as standard or with the diagnostic and communicating function.

The shunt close closes the circuit breaker instantaneously when powered if the spring mechanism is charged. The minimum duration of the pulse operating order must be 200 ms.

For information on installation, consult the instruction sheet on the Schneider Electric website:

Standard shunt close (XF): NVE40749

Diagnostic and communicating shunt close (XF diag&com): NVE40766

The Masterpact shunt trip (MX) is available as standard or with the diagnostic and communicating function.

The shunt trip opens the circuit breaker instantaneously when powered. The minimum duration of the pulse operating order must be 200 ms. The MX standard trip locks the circuit breaker in OFF position if the command is maintained.

Standard shunt trip (MX): NVE40749

Diagnostic and communicating shunt trip (MX diag&com): NVE40766

The Masterpact undervoltage release (MN) is available as standard or with the diagnostic and communicating function.

The undervoltage release instantaneously opens the circuit breaker when its supply voltage drops to a value between 35% and 70% of its rated voltage. If there is no supply to the release, it is impossible to close the circuit breaker, either manually or electrically. Any attempt to close the circuit breaker has no effect on the main contacts. Circuit breaker closing is enabled again when the supply voltage of the release returns to 85% of its rated value.

Standard undervoltage release (MN): NVE40749

Diagnostic undervoltage release (MN diag): NVE40766

The internal isolation module for Micrologic X control units provides double isolation in compliance with IEC 60664-1 (up to 12 kV). It also provides isolation between the diagnostic and communicating shunt close (XF diag&com), diagnostic and communicating shunt trip (MX diag&com), diagnostic undervoltage release (MN diag), and the electrical closing pushbutton (BPFE).

For information on accessory installation, consult instruction sheet NVE40748 on the Schneider Electric website.

The electrical closing pushbutton (BPFE) carries out electrical closing of the circuit breaker. It takes into account the internal closing conditions of the device and the external conditions that are part of the control and monitoring system of the installation. It connects to the standard shunt closes (XF) or the communicating shunt close (XF diag&com).

If the BPFE is being used, it is recommended to lock access to the closing pushbutton using the VBP accessory because the closing pushbutton does not take into account internal and external conditions.

This optional accessory is mounted on the front cover of the device.

For information on accessory installation, consult instruction sheet NVE40773 on the Schneider Electric website.

The ready-to-close contact (PF) indicates remotely that the circuit breaker is ready to close..

It indicates that the circuit breaker is ready to close when:

The circuit breaker is in the open position.

The spring mechanism is charged.

There is no maintained opening order.

This optional accessory is mounted inside the device.

For information on accessory installation, consult instruction sheet NVE35466 on the Schneider Electric website.

The spring charging motor (MCH) automatically charges the spring mechanism when the circuit breaker is closed, allowing instantaneous closing of the circuit breaker following opening.

For information on accessory installation, consult instruction sheet NVE35483 on the Schneider Electric website.

Following tripping, this function resets the overcurrent trip switch (SDE) and the mechanical indicator to enable circuit breaker closing.

The use of a shunt close (XF) is required with this option.

The additional overcurrent trip switch (SDE2) is not compatible with RES.

For information on accessory installation, consult instruction sheet NVE35503 on the Schneider Electric website.

The ERMS switch module (ESM) is an optional accessory mounted inside of the device.

It is used to engage ERMS protection settings with an external selector switch. The ESM module works in conjunction with the ERMS Digital Module, which must also be installed.

The ERMS switch module (ESM) is not compatible with M2C programmable contacts because they are installed in the same physical place.

The grounding kit (KMT) allows the circuit breaker mechanism to be grounded when the front cover is removed. The grounding is made through the cradle for the drawout version and through the mounting side plate for the fixed version.

For information on accessory installation, consult instruction sheet NVE35480 on the Schneider Electric website.

The mechanical operation counter (CDM) counts the number of operating cycles and is visible on the front panel. It is compatible with manual and electrical control functions.

This accessory is required for all source-changeover systems.

For information on accessory installation, consult instruction sheet NVE35485 on the Schneider Electric website.

The ULP port module:

Supplies 24 Vdc power to the Micrologic X control unit.

Integrates the ULP termination with the Micrologic X control unit.

Allows the connection of the Micrologic X control unit to external ULP modules, such as the embedded Ethernet interface (EIFE)) or the Ethernet interface (IFE).

The ULP port module is optional on the fixed device and standard on the drawout device. It is mounted with the terminal blocks of the device.

For information on accessory installation, consult the instruction sheet on the Schneider Electric website:

ULP port module for fixed Masterpact MTZ2/MTZ3: NVE40791 .

ULP port module for drawout Masterpact MTZ2/MTZ3: NVE40797

The embedded Ethernet interface (EIFE) enables drawout Masterpact MTZ circuit breakers to be connected to an Ethernet network. It provides digital access to all the data delivered by the Micrologic X control unit.

In addition, it monitors the position of the device in the cradle: connected, test, and disconnected.

This optional accessory is mounted on the cradle of the drawout device.

For information on accessory installation, consult instruction sheet NVE23550 on the Schneider Electric website.

For information on accessory usage, refer to user Enerlin’X EIFE Embedded Ethernet Interface for One Masterpact MTZ Drawout Circuit Breaker - User Guide (DOCA0106EN) , available on the Schneider Electric website.

The Ethernet interface (IFE) provides an Ethernet access to a single device. The device is connected to the IFE interface through the ULP port module and a prefabricated ULP cord.

For information on accessory installation, consult instruction sheet HRB49218 on the Schneider Electric website.

For information on accessory usage, refer to Enerlin’X IFE Ethernet Interface for One Circuit Breaker - User Guide (DOCA0084EN) , available on the Schneider Electric website.

The Ethernet switchboard server (IFE) provides Ethernet access to one or several circuit breakers. It allows the following communication architectures:

One single circuit breaker connected to the IFE server through the ULP port module.

Up to 20 circuit breakers, including up to 12 Compact NSX devices, through the IFM Modbus-SL (RTU) interface for one circuit breaker stacked to the IFE server.

For information on accessory installation, consult instruction sheet HRB49218 , available at the Schneider Electric website.

For information on accessory usage, refer to Enerlin’X IFE Ethernet Interface for One Circuit Breaker - User Guide (DOCA0084EN) on the Schneider Electric website.

The IFM Modbus-SL (RTU) interface provides access from a single device to a Modbus serial line communication network. The device is connected to the IFM interface through the ULP port module and a prefabricated ULP cord.

For information on installation, consult the instruction sheet on the Schneider Electric website: https://www.schneider-electric.us/en/download/document/NVE85393/.

The IO input/output application module for one circuit breaker is one component of the ULP architecture.

The IO input/output application module uses built-in applications to enhance control and monitoring functions. Its resources are:

Six self-powered digital inputs for either NO and NC dry contact or pulse counters.

Three digital outputs that are bistable relay (5 A maximum).

One analog input for a Pt100 temperature sensor.

For information on accessory installation, consult instruction sheet HRB49217 on the Schneider Electric website.

For information on accessory usage, refer to Enerlin’X IO Input/Output Application Module for One Circuit Breaker - User Guide (0613IB1317) on the Schneider Electric website.

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