Motor Protection Circuit Breakers

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.


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Description Price Current Range Number of Poles Range Breaking Capacity Terminal Type Voltage Rating Reset Method Length Width Depth Dimensions For Use With Series
RS Stock No. 194-7640
Mfr. Part No.S8V-CP0424
BrandOmron
$276.06
Each
units
40 A - - - Push In 24 V dc - 44.8mm 94.8mm 95.1mm 44.8 x 94.8 x 95.1 mm - S8V-CP
RS Stock No. 194-7641
Mfr. Part No.S8V-CP0824
BrandOmron
$473.29
Each
units
70 A - - - Push In 24 V dc - 42mm 122.5mm 131mm 42 x 122.5 x 131 mm - S8V-CP