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. 445-0342
Mfr. Part No.MS116-1.6
BrandABB
€62.79
Each
units
- 3P - - - 690 V ac - - - - - - MS116
RS Stock No. 711-6442
Mfr. Part No.MS132-0.16
BrandABB
€65.90
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS Stock No. 445-0392
Mfr. Part No.MS116-10
BrandABB
€73.39
Each
units
- 3P - - - 690 V ac - - - - - - MS116
RS Stock No. 445-0409
Mfr. Part No.MS116-16
BrandABB
€73.39
Each
units
- 3P - - - 690 V ac - - - - - - MS116
RS Stock No. 711-6468
Mfr. Part No.MS132-4.0
BrandABB
€75.81
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS Stock No. 445-0364
Mfr. Part No.MS116-4.0
BrandABB
€66.21
Each
units
- 3P - - - 690 V ac - - - - - - MS116
RS Stock No. 711-6499
Mfr. Part No.MS132-32
BrandABB
€135.46
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS Stock No. 711-6486
Mfr. Part No.MS132-20
BrandABB
€94.44
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS Stock No. 445-0358
Mfr. Part No.MS116-2.5
BrandABB
€66.21
Each
units
- 3P - - - 690 V ac - - - - - - MS116
RS Stock No. 711-6464
Mfr. Part No.MS132-2.5
BrandABB
€75.81
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS Stock No. 711-6480
Mfr. Part No.MS132-25
BrandABB
€106.89
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS Stock No. 445-0386
Mfr. Part No.MS116-6.3
BrandABB
€66.21
Each
units
- 3P - - - 690 V ac - - - - - - MS116
RS Stock No. 445-0314
Mfr. Part No.MS116-0.4
BrandABB
€55.48
Each
units
- 3P - - - 690 V ac - - - - - - MS116
RS Stock No. 711-6470
Mfr. Part No.MS132-10
BrandABB
€83.29
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS Stock No. 486-3518
Mfr. Part No.1SAM250000R1012
BrandABB
€107.67
Each
units
- 3P - - - 690 V ac - - - - - - ISAM
RS Stock No. 711-6452
Mfr. Part No.MS132-1.0
BrandABB
€75.81
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS Stock No. 711-6461
Mfr. Part No.MS132-1.6
BrandABB
€75.81
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS Stock No. 764-9075
Mfr. Part No.MS116-20
BrandABB
€88.31
Each
units
16 → 20 A 3 MS Range 15 kA Screw 690 V ac - 97.8mm 45mm 86.6mm 97.8 x 45 x 86.6 mm - MS116
RS Stock No. 445-0320
Mfr. Part No.MS116-0.63
BrandABB
€55.48
Each
units
- 3P - - - 690 V ac - - - - - - MS116
RS Stock No. 711-6483
Mfr. Part No.MS132-12
BrandABB
€89.50
Each
units
- 3P - - - 690 V ac - - - - - - MS132