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 Power Rating
RS Stock No. 445-0386
Mfr. Part No.MS116-6.3
BrandABB
$118.82
Each
units
- 3P - - - 690 V ac - - - - - - MS116 -
RS Stock No. 246-4894
Mfr. Part No.3RV1021-1KA10
BrandSiemens
$185.17
Each
units
9 12.5 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 96mm 97 x 45 x 96 mm - 3RV1 -
RS Stock No. 818-182
Mfr. Part No.PKZM0-6,3
BrandEaton
$136.17
Each
units
4 6.3 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0 -
RS Stock No. 445-0392
Mfr. Part No.MS116-10
BrandABB
$129.73
Each
units
- 3P - - - 690 V ac - - - - - - MS116 -
RS Stock No. 395-0289
Mfr. Part No.GV2ME06
$294.68
Each
units
1 1.6 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M -
RS Stock No. 123-6689
Mfr. Part No.9000-41034-0100600
$283.86
Each
units
1 A, 2 A, 4 A, 6 A 4 MICO Intelligent - Cage Clamp 24 V dc - 70mm 80mm 90mm 70 x 80 x 90 mm - - -
RS Stock No. 445-0364
Mfr. Part No.MS116-4.0
BrandABB
$117.04
Each
units
- 3P - - - 690 V ac - - - - - - MS116 -
RS Stock No. 395-0194
Mfr. Part No.GV2ME32
$513.28
Each
units
24 32 A 3P TeSys 3 kA Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M -
RS Stock No. 706-1819
Mfr. Part No.3RV2011-1GA10
BrandSiemens
$235.53
Each
units
4.5 6.3 A 3P Sirius Innovation 6 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2 -
RS Stock No. 706-1866
Mfr. Part No.3RV2021-4CA10
BrandSiemens
$134.53
Each
units
17 22 A 3P Sirius Innovation 4 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2 -
RS Stock No. 305-2161
Mfr. Part No.GV2P06
$298.49
Each
units
1 1.6 A 3P TeSys 100 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P -
RS Stock No. 818-160
Mfr. Part No.PKZM0-2,5
BrandEaton
$137.98
Each
units
1.6 2.5 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0 -
RS Stock No. 818-176
Mfr. Part No.PKZM0-4
BrandEaton
$131.67
Each
units
2.5 4 A 3P - 60 kA - 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0 -
RS Stock No. 395-0295
Mfr. Part No.GV2ME05
$299.76
Each
units
0.63 1 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M -
RS Stock No. 774-0152
Mfr. Part No.PKE32/XTU-32
BrandEaton
$278.81
Each
units
8 32 A 3P - 100 kA Screw 690 V ac - 101mm 45mm 102.5mm 101 x 45 x 102.5 mm - PKE -
RS Stock No. 711-6499
Mfr. Part No.MS132-32
BrandABB
$239.46
Each
units
- 3P - - - 690 V ac - - - - - - MS132 15 kW
RS Stock No. 212-7961
Mfr. Part No.PKZM0-25
BrandEaton
$265.10
Each
units
20 25 A 3P - 40 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0 -
RS Stock No. 243-7123
Mfr. Part No.3RV1011-1DA10
BrandSiemens
$275.54
Each
units
2.2 3.2 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1 -
RS Stock No. 608-8359
Mfr. Part No.GV2L22
$321.64
Each
units
16 24 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L -
RS Stock No. 608-8523
Mfr. Part No.GV2P21
$426.62
Each
units
17 23 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P -
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