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. 351-5404
Mfr. Part No.140M-C2E-C16
£63.50
Each
Units
10 → 16 A 3P - 50 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
RS Stock No. 351-5397
Mfr. Part No.140M-C2E-C10
£59.80
Each
Units
6.3 → 10 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
RS Stock No. 351-5375
Mfr. Part No.140M-C2E-B63
£55.90
Each
Units
4 → 6.3 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
RS Stock No. 351-5369
Mfr. Part No.140M-C2E-B40
£55.90
Each
Units
2.5 → 4 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
RS Stock No. 351-5353
Mfr. Part No.140M-C2E-B25
£55.90
Each
Units
1.6 → 2.5 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
RS Stock No. 351-5347
Mfr. Part No.140M-C2E-B16
£54.10
Each
Units
1 → 1.6 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
RS Stock No. 351-5533
Mfr. Part No.140M-F8E-C45
£170.00
Each
Units
32 → 45 A - - 65 kA Screw 575 V - 110mm 54mm 109.5mm 110 x 54 x 109.5 mm - 140M
RS Stock No. 351-5527
Mfr. Part No.140M-F8E-C32
£152.00
Each
Units
23 → 32 A - - 30 kA Screw 575 V - 110mm 54mm 109.5mm 110 x 54 x 109.5 mm - 140M
RS Stock No. 351-5331
Mfr. Part No.140M-C2E-B10
£52.50
Each
Units
0.63 → 1 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
RS Stock No. 351-5426
Mfr. Part No.140M-C2E-C25
£72.10
Each
Units
18 → 25 A 3P - 15 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
RS Stock No. 351-5410
Mfr. Part No.140M-C2E-C20
£68.00
Each
Units
14.5 → 20 A 3P - 15 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
RS Stock No. 351-5325
Mfr. Part No.140M-C2E-A63
£51.10
Each
Units
0.45 → 0.63 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
RS Stock No. 351-5498
Mfr. Part No.140M-D8E-C20
£83.80
Each
Units
14.5 → 20 A - - 65 kA Screw 575 V - 90mm 72mm 84mm 90 x 72 x 84 mm - 140M
RS Stock No. 351-5511
Mfr. Part No.140M-D8E-C25
£90.40
Each
Units
18 → 25 A - - 30 kA Screw 575 V - 90mm 72mm 84mm 90 x 72 x 84 mm - 140M
RS Stock No. 351-5319
Mfr. Part No.140M-C2E-A40
£47.50
Each
Units
0.25 → 0.4 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
RS Stock No. 351-5460
Mfr. Part No.140M-D8E-B63
£70.40
Each
Units
4 → 6.3 A 3P - 100 kA - 415 V - 90mm 45mm 84mm 90 x 45 x 84 mm - 140M
RS Stock No. 351-5482
Mfr. Part No.140M-D8E-C16
£80.50
Each
Units
10 → 16 A - - 30 kA Screw 575 V - 90mm 72mm 84mm 90 x 72 x 84 mm - 140M
RS Stock No. 351-5476
Mfr. Part No.140M-D8E-C10
£75.10
Each
Units
6.3 → 10 A - - 30 kA Screw 575 V - 90mm 72mm 84mm 90 x 72 x 84 mm - 140M
RS Stock No. 351-5454
Mfr. Part No.140M-D8E-B40
£70.40
Each
Units
2.5 → 4 A 3P - 100 kA - 415 V - 90mm 45mm 84mm 90 x 45 x 84 mm - 140M
RS Stock No. 351-5296
Mfr. Part No.140M-C2E-A16
£47.50
Each
Units
0.1 → 0.16 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M