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. 866-1546
Mfr. Part No.XTPR2P5BC1
BrandEaton
kr 1 267,68
Each
Units
1.6 → 2.5 A 3P - 25 A@ 250 V dc, 32 A@ 690 V ac Screw 690 V ac Manual 45mm 93mm 94mm 45 x 93 x 94 mm - - -
RS Stock No. 706-1872
Mfr. Part No.3RV2021-4DA20
BrandSiemens
kr 906,26
Each
Units
20 → 25 A 3P Sirius Innovation 4 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - - -
RS Stock No. 243-7167
Mfr. Part No.3RV1011-1HA10
BrandSiemens
kr 614,66
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. 243-7044
Mfr. Part No.3RV1011-0FA10
BrandSiemens
kr 489,35
Each
Units
0.35 → 0.5 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1 -
RS Stock No. 123-6690
Mfr. Part No.9000-41034-0401000
kr 1 713,98
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. 706-1774
Mfr. Part No.3RV2011-1AA10
BrandSiemens
kr 573,21
Each
Units
1.1 → 1.6 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2 -
RS Stock No. 608-8292
Mfr. Part No.GV2L07
kr 464,85
Each
Units
1.6 → 2.5 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L -
RS Stock No. 246-4945
Mfr. Part No.3RV1021-4DA10
BrandSiemens
kr 945,17
Each
Units
20 → 25 A 3P Sirius Innovation 50 kA Screw 690 V - 97mm 45mm 96mm 97 x 45 x 96 mm - 3RV1 -
RS Stock No. 305-2183
Mfr. Part No.GV2P08
kr 533,28
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. 818-176
Mfr. Part No.PKZM0-4
BrandEaton
kr 476,43
Each
Units
2.5 → 4 A 3P - 60 kA - 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0 -
RS Stock No. 619-4735
Mfr. Part No.PKZM4-50
BrandEaton
kr 1 687,26
Each
Units
40 → 50 A 3P - 60 kA Screw 690 V ac - 140mm 55mm 160mm 140 x 55 x 160 mm - PKZM 4 -
RS Stock No. 818-182
Mfr. Part No.PKZM0-6,3
BrandEaton
kr 476,43
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. 711-6470
Mfr. Part No.MS132-10
BrandABB
kr 798,60
Each
Units
- 3P - - - 690 V ac - - - - - - MS132 4 kW
RS Stock No. 492-1484
Mfr. Part No.PKZM01-04
BrandEaton
kr 448,69
Each
Units
0.25 → 0.4 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01 -
RS Stock No. 818-744
Mfr. Part No.PKZM0-10
BrandEaton
kr 555,96
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. 608-8359
Mfr. Part No.GV2L22
kr 737,80
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. 445-0336
Mfr. Part No.MS116-1.0
BrandABB
kr 583,25
Each
Units
- 3P - - - 690 V ac - - - - - - MS116 -
RS Stock No. 305-2212
Mfr. Part No.GV2P16
kr 625,44
Each
Units
9 → 14 A 3P TeSys 6 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P -
RS Stock No. 608-8523
Mfr. Part No.GV2P21
kr 691,60
Each
Units
17 → 23 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P -
RS Stock No. 706-1879
Mfr. Part No.3RV2021-4EA20
BrandSiemens
kr 1 145,74
Each
Units
27 → 32 A 3P Sirius Innovation 4 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - - -
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