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
$217.75
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. 246-4973
Mfr. Part No.3RV1031-4FA10
BrandSiemens
$249.09
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. 187-728
Mfr. Part No.GV2RT04
$170.23
Each
units
0.4 → 0.63 A 3P TeSys - - 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2R
RS Stock No. 608-8832
Mfr. Part No.GV7RE80
$703.66
Each
units
48 → 80 A 3P TeSys 8 kA Screw 690 V ac Rocker Lever 161mm 105mm 111mm 161 x 105 x 111 mm - GV7R
RS Stock No. 246-4945
Mfr. Part No.3RV1021-4DA10
BrandSiemens
$138.29
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. 312-5269
Mfr. Part No.PKZM0-2,5-T
BrandEaton
$147.83
Each
units
1.6 → 2.5 A 3P - 150 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 706-1807
Mfr. Part No.3RV2011-1FA10
BrandSiemens
$110.20
Each
units
3.5 → 5 A 3P Sirius Innovation 6 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 243-7088
Mfr. Part No.3RV1011-0KA10
BrandSiemens
$223.44
Each
units
0.9 → 1.25 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 608-8501
Mfr. Part No.GV2P03
$263.68
Each
units
0.25 → 0.4 A 3P TeSys 100 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS Stock No. 395-0302
Mfr. Part No.GV2ME04
$85.25
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
RS Stock No. 246-4967
Mfr. Part No.3RV1031-4EA10
BrandSiemens
$214.26
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. 492-1529
Mfr. Part No.PKZM01-2,5
BrandEaton
$141.62
Each
units
1.6 → 2.5 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01
RS Stock No. 243-7173
Mfr. Part No.3RV1011-1JA10
BrandSiemens
$287.97
Each
units
7 → 10 A 3P Sirius Innovation 50 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 123-6693
Mfr. Part No.9000-41042-0100600
$139.71
Each
units
1 A, 2 A, 4 A, 6 A 2 - - Cage Clamp 24 V dc - 36mm 80mm 90mm 36 x 80 x 90 mm - -
RS Stock No. 619-4707
Mfr. Part No.PKZM4-32
BrandEaton
$226.99
Each
units
25 → 32 A 3P - 60 kA Screw 690 V ac - 140mm 55mm 160mm 140 x 55 x 160 mm - PKZM 4
RS Stock No. 797-5566
Mfr. Part No.EMS-DOS-T-9-24VDC
BrandEaton
$294.76
Each
units
1.5 → 6.5 A 1 ATEX 3 A Screw 24 V dc, 550 V ac Manual 123.5mm 157mm 30mm 123.5 x 157 x 30 mm - -
RS Stock No. 395-0201
Mfr. Part No.GV2ME22
$399.36
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. 124-3091
Mfr. Part No.3RV2011-1DA15
BrandSiemens
$99.30
Each
units
2.2 → 3.2 A 3 Sirius Innovation 100 kA @ 400 V ac Screw 690 V ac Manual 45mm 96.9mm 97mm 45 x 97 x 96.9 mm Three Phase Motors SRV2
RS Stock No. 243-7151
Mfr. Part No.3RV1011-1GA10
BrandSiemens
$121.50
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. 413-1596
Mfr. Part No.GV2ME083
$290.13
Each
units
2.5 → 4 A 3P TeSys - Cage Clamp 500 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
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