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. 706-1841
Mfr. Part No.3RV2021-4AA10
BrandSiemens
TWD2,667.00
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. 706-1822
Mfr. Part No.3RV2011-1HA10
BrandSiemens
TWD2,196.00
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. 246-5011
Mfr. Part No.3RV1041-4JA10
BrandSiemens
TWD6,551.00
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. 246-5027
Mfr. Part No.3RV1041-4KA10
BrandSiemens
TWD8,759.00
Each
units
57 → 75 A 3P Sirius Innovation 50 kA Screw 690 V - 165mm 70mm 174mm 165 x 70 x 174 mm - 3RV1
RS Stock No. 706-1866
Mfr. Part No.3RV2021-4CA10
BrandSiemens
TWD2,843.00
Each
units
17 → 22 A 3P Sirius Innovation 4 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
TWD2,244.00
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. 706-1800
Mfr. Part No.3RV2011-1EA10
BrandSiemens
TWD2,196.00
Each
units
2.8 → 4 A 3P Sirius Innovation 6 kA Screw 690 V - 109mm 45mm 91mm 109 x 45 x 91 mm - 3RV2
RS Stock No. 243-7139
Mfr. Part No.3RV1011-1EA10
BrandSiemens
TWD2,500.00
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. 706-1774
Mfr. Part No.3RV2011-1AA10
BrandSiemens
TWD2,104.00
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. 124-3095
Mfr. Part No.3RV2011-0HA15
BrandSiemens
TWD2,482.00
Each
units
0.55 → 0.8 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. 754-6679
Mfr. Part No.3RV1011-1EA15
BrandSiemens
TWD3,087.00
Each
units
4 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 90mm 45mm 81mm 90 x 45 x 81 mm - -
RS Stock No. 246-4967
Mfr. Part No.3RV1031-4EA10
BrandSiemens
TWD6,706.00
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. 755-2943
Mfr. Part No.3RV2811-1FD10
BrandSiemens
TWD5,036.00
Each
units
5 A 3P Sirius Innovation 65 kA Screw 690 V - 144mm 45mm 91mm 144 x 45 x 91 mm - -
RS Stock No. 754-6673
Mfr. Part No.3RV1011-1GA15
BrandSiemens
TWD3,087.00
Each
units
6.3 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 90mm 45mm 81mm 90 x 45 x 81 mm - -
RS Stock No. 706-1863
Mfr. Part No.3RV2021-4DA10
BrandSiemens
TWD3,249.00
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. 755-2814
Mfr. Part No.3RV1341-4MC10
BrandSiemens
TWD12,577.00
Each
units
100 A 3P Sirius Innovation 50 kA Screw 690 V ac/dc - 165mm 70mm 174mm 165 x 70 x 174 mm - -
RS Stock No. 706-1765
Mfr. Part No.3RV2011-0JA10
BrandSiemens
TWD1,988.00
Each
units
0.7 → 1 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 124-3092
Mfr. Part No.3RV2021-1KA10
BrandSiemens
TWD2,560.00
Each
units
9 → 12.5 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 3RV2
New
RS Stock No. 196-3577
Mfr. Part No.3VA24635HL320AA0
BrandSiemens
TWD127,248.00
Each
units
250 → 630 A 3 Sentron 85 @ 240 V kA Front, Lug 690 V ac - 138mm 137mm 248mm 138 x 110 x 248 mm Line Protection 3VA2
RS Stock No. 706-1872
Mfr. Part No.3RV2021-4DA20
BrandSiemens
TWD2,695.00
Each
units
20 → 25 A 3P Sirius Innovation 4 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -