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. 445-0358
Mfr. Part No.MS116-2.5
BrandABB
$117.04
Each
units
1.6 2.5 A 3P - 50 kA Screw 690 V ac - - - - 45 x 90 x 85.6 mm - MS116
RS Stock No. 243-7167
Mfr. Part No.3RV1011-1HA10
BrandSiemens
$120.40
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. 706-1829
Mfr. Part No.3RV2011-1JA10
BrandSiemens
$312.30
Each
units
7 → 10 A 3P Sirius Innovation 6 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 608-8315
Mfr. Part No.GV2L10
$257.48
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. 492-1535
Mfr. Part No.PKZM01-4
BrandEaton
$126.45
Each
units
2.5 → 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. 706-1822
Mfr. Part No.3RV2011-1HA10
BrandSiemens
$110.20
Each
units
5.5 → 8 A 3P Sirius Innovation 6 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 243-7101
Mfr. Part No.3RV1011-1BA10
BrandSiemens
$125.49
Each
units
1.4 → 2 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 243-7139
Mfr. Part No.3RV1011-1EA10
BrandSiemens
$120.40
Each
units
2.8 → 4 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 608-8517
Mfr. Part No.GV2P04
$249.60
Each
units
0.4 → 0.63 A 3P TeSys 100 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS Stock No. 445-0409
Mfr. Part No.MS116-16
BrandABB
$129.73
Each
units
10 → 16 A 3P - 50 kA Screw 690 V ac - - - - 45 x 90 x 85.6 mm - MS116
RS Stock No. 243-7050
Mfr. Part No.3RV1011-0GA10
BrandSiemens
$97.06
Each
units
0.45 → 0.63 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 492-1513
Mfr. Part No.PKZM01-1.6
BrandEaton
$114.93
Each
units
1 → 1.6 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01
RS Stock No. 755-2729
Mfr. Part No.3RV1042-4MA10
BrandSiemens
$830.05
Each
units
100 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 165mm 70mm 174mm 165 x 70 x 174 mm - -
RS Stock No. 608-8337
Mfr. Part No.GV2L16
$158.84
Each
units
12 → 18 A, 9 → 13 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS Stock No. 764-9087
Mfr. Part No.MS116-32
BrandABB
$224.16
Each
units
25 → 32 A 3 MS Range 10 kA Screw 690 V ac - 97.8mm 45mm 86.6mm 97.8 x 45 x 86.6 mm - MS116
RS Stock No. 706-1796
Mfr. Part No.3RV2011-1DA10
BrandSiemens
$110.20
Each
units
2.2 → 3.2 A 3P Sirius Innovation 10 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 243-7072
Mfr. Part No.3RV1011-0JA10
BrandSiemens
$265.53
Each
units
0.7 → 1 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 305-2155
Mfr. Part No.GV2P05
$298.49
Each
units
0.63 → 1 A 3P TeSys 100 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS Stock No. 124-3105
Mfr. Part No.3RV2021-1JA10
BrandSiemens
$121.67
Each
units
7 → 10 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. 608-8365
Mfr. Part No.GV2L32
$285.66
Each
units
23 → 32 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
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