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 breakersMotor 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 Priced to Clear Series
RS Stock No. 122-0732
Mfr. Part No.MPW18-3-D063
BrandWEG
£38.45
Each
Units
4 6.3 A 3 - 100 kA/415V Screw 690 V Manual 90mm 45mm 77mm 44.8 x 77 x 97 mm Motors - MPW18
RS Stock No. 122-1348
Mfr. Part No.MPW40-3-U016
BrandWEG
£47.38
Each
Units
10 16 A 3 - 50 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors - MPW40
RS Stock No. 122-1347
Mfr. Part No.MPW40-3-U010
BrandWEG
£47.38
Each
Units
6.3 → 10 A 3 - 100 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors - MPW40
RS Stock No. 122-1346
Mfr. Part No.MPW40-3-D063
BrandWEG
£40.30
Each
Units
4 → 6.3 A 3 - 100 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors - MPW40
RS Stock No. 122-0729
Mfr. Part No.MPW18-3-D016
BrandWEG
£38.07
Each
Units
1 → 1.6 A 3 - 100 kA/415V Screw 690 V Manual 90mm 45mm 77mm 44.8 x 77 x 97 mm Motors - MPW18
RS Stock No. 122-1338
Mfr. Part No.MPW40i-3-U040
BrandWEG
£91.38
Each
Units
40 A 3 - 30 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors - MPW40i
RS Stock No. 122-1343
Mfr. Part No.MPW40-3-D016
BrandWEG
£40.30
Each
Units
1 → 1.6 A 3 - 100 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors - MPW40
RS Stock No. 122-0728
Mfr. Part No.MPW18-3-U001
BrandWEG
£36.30
Each
Units
0.63 → 1 A 3 - 100 kA/415V Screw 690 V Manual 90mm 45mm 77mm 44.8 x 77 x 97 mm Motors - MPW18
RS Stock No. 122-0734
Mfr. Part No.MPW18-3-U016
BrandWEG
£44.85
Each
Units
10 → 16 A 3 - 10 kA/415V Screw 690 V Manual 90mm 45mm 77mm 44.8 x 77 x 97 mm Motors - MPW18
RS Stock No. 122-1345
Mfr. Part No.MPW40-3-U004
BrandWEG
£40.30
Each
Units
2.5 → 4 A 3 - 100 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors - MPW40
RS Stock No. 122-0731
Mfr. Part No.MPW18-3-U004
BrandWEG
£38.45
Each
Units
2.5 → 4 A 3 - 100 kA/415V Screw 690 V Manual 90mm 45mm 77mm 44.8 x 77 x 97 mm Motors - MPW18
RS Stock No. 122-1337
Mfr. Part No.MPW40-3-U040
BrandWEG
£101.53
Each
Units
32 → 40 A 3 - 30 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors - MPW40
RS Stock No. 122-0730
Mfr. Part No.MPW18-3-D025
BrandWEG
£38.45
Each
Units
1.6 → 2.5 A 3 - 100 kA/415V Screw 690 V Manual 90mm 45mm 77mm 44.8 x 77 x 97 mm Motors - MPW18
RS Stock No. 122-1357
Mfr. Part No.MPW40i-3-D016
BrandWEG
£37.68
Each
Units
1.6 A 3 - 100 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors - MPW40i
RS Stock No. 122-1342
Mfr. Part No.MPW40-3-C063
BrandWEG
£36.07
Each
Units
0.4 → 0.63 A 3 - 100 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors - MPW40
RS Stock No. 122-1366
Mfr. Part No.MPW40t-3-C016
BrandWEG
£37.24
Each
Units
0.1 0.16 A 3 - 100 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors - MPW40t
RS Stock No. 122-1360
Mfr. Part No.MPW40i-3-D063
BrandWEG
£37.31
Each
Units
6.3 A 3 - 100 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors - MPW40i
RS Stock No. 122-0733
Mfr. Part No.MPW18-3-U010
BrandWEG
£45.30
Each
Units
6.3 → 10 A 3 - 50 kA/415V Screw 690 V Manual 90mm 45mm 77mm 44.8 x 77 x 97 mm Motors - MPW18
RS Stock No. 122-0746
Mfr. Part No.MPW18i-3-U016
BrandWEG
£44.23
Each
Units
16 A 3 - 10 kA/415V Screw 690 V Manual 90mm 45mm 77mm 44.8 x 77 x 97 mm Motors - MPW18i
RS Stock No. 122-0744
Mfr. Part No.MPW18i-3-D063
BrandWEG
£37.24
Each
Units
6.3 A 3 - 100 kA/415V Screw 690 V Manual 90mm 45mm 77mm 44.8 x 77 x 97 mm Motors - MPW18i