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. 706-1863
Mfr. Part No.3RV2021-4DA10
BrandSiemens
HK$826.54
Each
units
20 → 25 A 3P Sirius Innovation 4 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
HK$537.83
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. 706-1803
Mfr. Part No.3RV2011-1EA20
BrandSiemens
HK$558.84
Each
units
2.8 → 4 A 3P Sirius Innovation 6 kA Cage Clamp 690 V - 109mm 45mm 91mm 109 x 45 x 91 mm - 3RV2
RS Stock No. 875-1119
Mfr. Part No.3RV2031-4PA10
BrandSiemens
HK$1,622.88
Each
units
28 → 36 A 3 Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm Motor Protection 3RV2
RS Stock No. 875-1122
Mfr. Part No.3RV2031-4VA10
BrandSiemens
HK$1,919.29
Each
units
35 → 45 A 3 Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm Motor Protection 3RV2
RS Stock No. 243-7167
Mfr. Part No.3RV1011-1HA10
BrandSiemens
HK$639.09
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. 243-7101
Mfr. Part No.3RV1011-1BA10
BrandSiemens
HK$639.09
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. 706-1784
Mfr. Part No.3RV2011-1CA10
BrandSiemens
HK$561.51
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. 706-1838
Mfr. Part No.3RV2011-1JA20
BrandSiemens
HK$629.32
Each
units
7 → 10 A 3P Sirius Innovation 6 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 706-1790
Mfr. Part No.3RV2011-1DA20
BrandSiemens
HK$464.24
Each
units
2.2 → 3.2 A 3P Sirius Innovation 10 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
HK$1,666.69
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. 706-1831
Mfr. Part No.3RV2011-1KA10
BrandSiemens
HK$626.34
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
HK$710.77
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. 243-7088
Mfr. Part No.3RV1011-0KA10
BrandSiemens
HK$605.52
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. 706-1875
Mfr. Part No.3RV2021-4EA10
BrandSiemens
HK$1,046.42
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. 706-1787
Mfr. Part No.3RV2011-1BA10
BrandSiemens
HK$558.84
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. 706-1771
Mfr. Part No.3RV2011-0KA20
BrandSiemens
HK$443.76
Each
units
0.9 → 1.25 A 3P Sirius Innovation 100 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 875-1125
Mfr. Part No.3RV2031-4WA10
BrandSiemens
HK$1,958.30
Each
units
42 → 52 A 3 Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm Motor Protection 3RV2
RS Stock No. 706-1728
Mfr. Part No.3RV2011-0DA10
BrandSiemens
HK$470.07
Each
units
0.22 → 0.32 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 754-6660
Mfr. Part No.3RV1011-0EA15
BrandSiemens
HK$683.43
Each
units
0.4 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 90mm 45mm 81mm 90 x 45 x 81 mm - -