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. 706-1768
Mfr. Part No.3RV2011-0JA20
BrandSiemens
R 905.44
Each
units
0.7 → 1 A 3P Sirius Innovation 100 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS stock no. 246-5011
Mfr. Part No.3RV1041-4JA10
BrandSiemens
R 4,045.14
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. 755-2703
Mfr. Part No.3RV1041-4HA10
BrandSiemens
R 3,000.00
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. 246-4844
Mfr. Part No.3RV1021-1EA10
BrandSiemens
R 941.00
Each
units
2.8 → 4 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 96mm 97 x 45 x 96 mm - 3RV1
RS stock no. 246-4894
Mfr. Part No.3RV1021-1KA10
BrandSiemens
R 1,650.46
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. 243-7123
Mfr. Part No.3RV1011-1DA10
BrandSiemens
R 1,102.14
Each
units
2.2 → 3.2 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS stock no. 246-4945
Mfr. Part No.3RV1021-4DA10
BrandSiemens
R 1,756.76
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. 246-4967
Mfr. Part No.3RV1031-4EA10
BrandSiemens
R 2,726.40
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. 243-7088
Mfr. Part No.3RV1011-0KA10
BrandSiemens
R 1,178.74
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. 243-7167
Mfr. Part No.3RV1011-1HA10
BrandSiemens
R 1,144.36
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. 243-7151
Mfr. Part No.3RV1011-1GA10
BrandSiemens
R 828.00
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. 246-4901
Mfr. Part No.3RV1021-4AA10
BrandSiemens
R 1,050.00
Each
units
11 → 16 A 3P Sirius Innovation 50 kA Screw 690 V - 97mm 45mm 96mm 97 x 45 x 96 mm - 3RV1
RS stock no. 755-2713
Mfr. Part No.3RV1042-4JA10
BrandSiemens
R 4,590.00
Each
units
63 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 165mm 70mm 174mm 165 x 70 x 174 mm - -
RS stock no. 706-1831
Mfr. Part No.3RV2011-1KA10
BrandSiemens
R 1,115.97
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. 243-7145
Mfr. Part No.3RV1011-1FA10
BrandSiemens
R 1,102.14
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. 243-7139
Mfr. Part No.3RV1011-1EA10
BrandSiemens
R 1,144.74
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. 755-2839
Mfr. Part No.3RV1342-4KC10
BrandSiemens
R 4,890.00
Each
units
75 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 165mm 70mm 174mm 165 x 70 x 174 mm - -
RS stock no. 243-7094
Mfr. Part No.3RV1011-1AA10
BrandSiemens
R 1,045.05
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. 755-2729
Mfr. Part No.3RV1042-4MA10
BrandSiemens
R 5,470.00
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. 755-2930
Mfr. Part No.3RV2311-1HC10
BrandSiemens
R 698.00
Each
units
8 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -