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. 243-7145
Mfr. Part No.3RV1011-1FA10
BrandSiemens
MYR374.76
Each
units
3.5 → 5 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 246-4894
Mfr. Part No.3RV1021-1KA10
BrandSiemens
MYR493.05
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. 706-1841
Mfr. Part No.3RV2021-4AA10
BrandSiemens
MYR399.83
Each
units
11 → 16 A 3P Sirius Innovation 4 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 706-1819
Mfr. Part No.3RV2011-1GA10
BrandSiemens
MYR287.92
Each
units
4.5 → 6.3 A 3P Sirius Innovation 6 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 706-1844
Mfr. Part No.3RV2011-4AA10
BrandSiemens
MYR383.73
Each
units
11 → 16 A 3P Sirius Innovation 4 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS Stock No. 706-1807
Mfr. Part No.3RV2011-1FA10
BrandSiemens
MYR329.26
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. 706-1831
Mfr. Part No.3RV2011-1KA10
BrandSiemens
MYR369.03
Each
units
9 → 12 A 3P Sirius Innovation 6 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 243-7173
Mfr. Part No.3RV1011-1JA10
BrandSiemens
MYR418.78
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. 706-1853
Mfr. Part No.3RV2021-4BA10
BrandSiemens
MYR399.83
Each
units
14 → 20 A 3P Sirius Innovation 4 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 246-4995
Mfr. Part No.3RV1031-4HA10
BrandSiemens
MYR1,326.84
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. 246-4967
Mfr. Part No.3RV1031-4EA10
BrandSiemens
MYR1,005.18
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. 243-7101
Mfr. Part No.3RV1011-1BA10
BrandSiemens
MYR374.76
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. 124-3102
Mfr. Part No.3RV2021-1EA10
BrandSiemens
MYR343.56
Each
units
2.8 → 4 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. 243-7094
Mfr. Part No.3RV1011-1AA10
BrandSiemens
MYR356.77
Each
units
1.1 → 1.6 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 243-7088
Mfr. Part No.3RV1011-0KA10
BrandSiemens
MYR356.77
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. 706-1784
Mfr. Part No.3RV2011-1CA10
BrandSiemens
MYR329.26
Each
units
1.8 → 2.5 A 3P Sirius Innovation 10 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 706-1829
Mfr. Part No.3RV2011-1JA10
BrandSiemens
MYR369.03
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. 706-1774
Mfr. Part No.3RV2011-1AA10
BrandSiemens
MYR315.38
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. 124-3106
Mfr. Part No.3RV2021-4CA15
BrandSiemens
MYR504.86
Each
units
17 → 22 A 3 Sirius Innovation 55 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
MYR374.76
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