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. 351-5353
Mfr. Part No.140M-C2E-B25
€72.02
Each
units
1.6 2.5 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M -
RS Stock No. 395-0251
Mfr. Part No.GV2ME08
€53.26
Each
units
2.5 4 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. 395-0245
Mfr. Part No.GV2ME10
€53.26
Each
units
4 → 6.3 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. 305-2183
Mfr. Part No.GV2P08
€75.06
Each
units
2.5 → 4 A 3P TeSys 8 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P -
RS Stock No. 395-0267
Mfr. Part No.GV2ME07
€53.26
Each
units
1.6 → 2.5 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. 395-0289
Mfr. Part No.GV2ME06
€53.26
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. 395-0239
Mfr. Part No.GV2ME14
€62.45
Each
units
6 → 10 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. 734-9037
Mfr. Part No.A9E21180
€233.24
Each
units
8 A 2 Acti 9 - - 400 V ac - - - - - - iCT -
RS Stock No. 246-4995
Mfr. Part No.3RV1031-4HA10
BrandSiemens
€255.91
Each
units
40 → 50 A 3P Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm - 3RV1 -
RS Stock No. 351-5397
Mfr. Part No.140M-C2E-C10
€76.83
Each
units
6.3 10 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M -
RS Stock No. 818-744
Mfr. Part No.PKZM0-10
BrandEaton
€75.72
Each
units
6.3 → 10 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0 -
RS Stock No. 331-3674
BrandRS PRO
€44.94
Each
units
16 → 20 A - - - Screw 690 V - 80mm 45mm 73.5mm 80 x 45 x 73.5 mm MS25 Series XL2000 -
RS Stock No. 351-5347
Mfr. Part No.140M-C2E-B16
€69.68
Each
units
1 → 1.6 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M -
RS Stock No. 246-4967
Mfr. Part No.3RV1031-4EA10
BrandSiemens
€193.87
Each
units
22 → 32 A 3P Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm - 3RV1 -
RS Stock No. 246-4973
Mfr. Part No.3RV1031-4FA10
BrandSiemens
€226.62
Each
units
28 → 40 A 3P Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm - 3RV1 -
RS Stock No. 246-4894
Mfr. Part No.3RV1021-1KA10
BrandSiemens
€95.10
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. 395-0217
Mfr. Part No.GV2ME20
€62.45
Each
units
13 → 18 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. 351-5404
Mfr. Part No.140M-C2E-C16
€81.64
Each
units
10 → 16 A 3P - 50 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M -
RS Stock No. 608-8337
Mfr. Part No.GV2L16
€69.89
Each
units
9 → 13 A, 12 → 18 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L -
RS Stock No. 395-0302
Mfr. Part No.GV2ME04
€48.28
Each
units
0.4 → 0.63 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M -
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