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. 123-6690
Mfr. Part No.9000-41034-0401000
R 2,691.78
Each
units
4 A, 6 A, 8 A, 10 A 4 MICO Intelligent - Cage Clamp 24 V dc - 70mm 80mm 90mm 70 x 80 x 90 mm - -
RS stock no. 608-8309
Mfr. Part No.GV2L08
R 1,505.27
Each
units
2.5 → 4 A, 4 → 6 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS stock no. 608-8315
Mfr. Part No.GV2L10
R 1,505.27
Each
units
4 → 6 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS stock no. 243-7167
Mfr. Part No.3RV1011-1HA10
BrandSiemens
R 1,331.42
Each
units
5.5 → 8 A 3P Sirius Innovation 50 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS stock no. 305-2199
Mfr. Part No.GV2P10
R 997.61
Each
units
4 → 6.3 A 3P TeSys 6 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS stock no. 818-154
Mfr. Part No.PKZM0-1,6
BrandEaton
R 1,442.49
Each
units
1 → 1.6 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS stock no. 395-0201
Mfr. Part No.GV2ME22
R 2,170.73
Each
units
20 → 25 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS stock no. 212-7955
Mfr. Part No.PKZM0-16
BrandEaton
R 1,965.69
Each
units
10 → 16 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS stock no. 711-6477
Mfr. Part No.MS132-6.3
BrandABB
R 1,422.35
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS stock no. 818-182
Mfr. Part No.PKZM0-6,3
BrandEaton
R 1,441.23
Each
units
4 → 6.3 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS stock no. 608-8359
Mfr. Part No.GV2L22
R 1,941.27
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. 711-6461
Mfr. Part No.MS132-1.6
BrandABB
R 1,423.19
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS stock no. 711-6470
Mfr. Part No.MS132-10
BrandABB
R 1,560.75
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS stock no. 608-8494
Mfr. Part No.GV2P02
R 869.94
Each
units
0.16 → 0.25 A 3P TeSys 100 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS stock no. 413-1631
Mfr. Part No.GV2ME203
R 2,017.03
Each
units
13 → 18 A 3P TeSys 6 kA Cage Clamp 500 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
R 2,877.00
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. 123-6689
Mfr. Part No.9000-41034-0100600
R 2,435.58
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. 243-7151
Mfr. Part No.3RV1011-1GA10
BrandSiemens
R 828.00
Each
units
4.5 → 6.3 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS stock no. 395-0194
Mfr. Part No.GV2ME32
R 2,350.06
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. 818-176
Mfr. Part No.PKZM0-4
BrandEaton
R 1,442.70
Each
units
2.5 → 4 A 3P - 60 kA - 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0