Motor protection circuit breakers act as protection devices for electric motors, monitoring the electrical supply in motor circuits of 50-60Hz. They protect against phase unbalances and losses, which are detrimental to motors, offer protection against current overload, and prevent short circuits.
What are motor protection circuit breakers used for? Motor protection circuit breakers are useful in industrial and building applications such as chillers, compressors, heat pumps and cooling towers, to prevent damages from short circuits or power surges. In the manufacturing industry, circuit breakers interrupt electrical faults below the breaking capacity, which protects machinery and equipment from blowouts.
Types of motor protection circuit breakers Motor protection circuit breakers come in A type or B type classifications, dependent on utilisation and function.
The A type breaker is not explicitly intended for selectivity and does not allow intentional short time delay under short circuit conditions.This means that the system interrupts immediately when current or voltage levels match the breaking capacity.
Type B breakers allow for an intentional and adjustable short time delay under short circuit conditions, which enables the system to continue for a short while with currents exceeding breaking capacity levels.
Description:
Modular Motor Protective Circuit Breakers designed for use
with add-on contactor modules and accessories which provide isolation, short circuit and thermal protection. The units are DIN-rail mounting and part of the xStart family of control gear products, and a range of connection and wiring accessories are available to speed up ...
Description:
Motor protection is provided by the thermal-magnetic protection
elements incorporated in the motor circuit breakerManual operation via a rotary selector switchScrew terminals.
Description:
For use with the TeSys contactor up to
15kW – for typical contactor see (stock no. 394-9813)Provides short-circuit and overload protectionLockable in the ’OFF’ positionAuxiliary contacts may be used to signal ’OFF’ or tripped conditionsScrew termination.
Description:
GV2ME motor circuit-breakers are 3-pole thermal-magnetic circuit-breakers specifically
designed for the control and protection of motors. These circuit-breakers are designed for connection with spring terminal connections., these ensure secure, permanent and durable clamping that is resistant to harsh environments, vibration and impact and is even more effective when conductors without ...
