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. 243-7044
Mfr. Part No.3RV1011-0FA10
BrandSiemens
kr 661,01
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. 706-1872
Mfr. Part No.3RV2021-4DA20
BrandSiemens
kr 1 086,73
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 789,62
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. 706-1774
Mfr. Part No.3RV2011-1AA10
BrandSiemens
kr 703,88
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. 706-1784
Mfr. Part No.3RV2011-1CA10
BrandSiemens
kr 734,79
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. 246-5011
Mfr. Part No.3RV1041-4JA10
BrandSiemens
kr 3 310,04
Each
Units
45 → 63 A 3P Sirius Innovation 50 kA Screw 690 V - 165mm 70mm 174mm 165 x 70 x 174 mm - 3RV1
RS Stock No. 706-1879
Mfr. Part No.3RV2021-4EA20
BrandSiemens
kr 1 157,20
Each
Units
27 → 32 A 3P Sirius Innovation 4 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS Stock No. 706-1740
Mfr. Part No.3RV2011-0GA10
BrandSiemens
kr 625,12
Each
Units
0.45 → 0.63 A 3P Sirius Innovation 100 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
kr 708,87
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. 706-1793
Mfr. Part No.3RV2011-1CA20
BrandSiemens
kr 734,79
Each
Units
1.8 → 2.5 A 3P Sirius Innovation 10 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 243-7139
Mfr. Part No.3RV1011-1EA10
BrandSiemens
kr 789,62
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. 706-1787
Mfr. Part No.3RV2011-1BA10
BrandSiemens
kr 734,79
Each
Units
1.4 → 2 A 3P Sirius Innovation 10 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 124-3103
Mfr. Part No.3RV2021-1GA10
BrandSiemens
kr 766,69
Each
Units
4.5 → 6.3 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. 706-1829
Mfr. Part No.3RV2011-1JA10
BrandSiemens
kr 823,52
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. 706-1780
Mfr. Part No.3RV2011-1BA20
BrandSiemens
kr 734,79
Each
Units
1.4 → 2 A 3P Sirius Innovation 10 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 755-2902
Mfr. Part No.3RV2021-4NA20
BrandSiemens
kr 1 375,86
Each
Units
28 A 3P Sirius Innovation 55 kA Cage Clamp 690 V - 119mm 45mm 91mm 119 x 45 x 91 mm - -
RS Stock No. 755-2703
Mfr. Part No.3RV1041-4HA10
BrandSiemens
kr 3 310,04
Each
Units
50 A 3P Sirius Innovation 50 kA Screw 690 V ac/dc - 165mm 70mm 174mm 165 x 70 x 174 mm - -
RS Stock No. 706-1875
Mfr. Part No.3RV2021-4EA10
BrandSiemens
kr 1 375,86
Each
Units
27 → 32 A 3P Sirius Innovation 4 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS Stock No. 706-1853
Mfr. Part No.3RV2021-4BA10
BrandSiemens
kr 892,32
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. 706-1813
Mfr. Part No.3RV2011-1GA20
BrandSiemens
kr 734,79
Each
Units
4.5 → 6.3 A 3P Sirius Innovation 6 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2