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 CAD Drawing For Use With Series
RS Stock No. 351-5404
Mfr. Part No.140M-C2E-C16
£62.80
Each
Units
10 → 16 A 3P - 50 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - - 140M
RS Stock No. 395-0267
Mfr. Part No.GV2ME07
£50.78
Each
Units
1.6 → 2.5 A 3P TeSys 3 kA Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm 3D CAD Model - GV2M
RS Stock No. 395-0289
Mfr. Part No.GV2ME06
£50.78
Each
Units
1 → 1.6 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm 3D CAD Model - GV2M
RS Stock No. 818-744
Mfr. Part No.PKZM0-10
BrandEaton
£70.97
Each
Units
6.3 → 10 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm 3D CAD Model - PKZM 0
RS Stock No. 212-7955
Mfr. Part No.PKZM0-16
BrandEaton
£70.97
Each
Units
10 → 16 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm 3D CAD Model - PKZM 0
RS Stock No. 351-5397
Mfr. Part No.140M-C2E-C10
£59.10
Each
Units
6.3 → 10 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - - 140M
RS Stock No. 395-0295
Mfr. Part No.GV2ME05
£50.78
Each
Units
0.63 → 1 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm 3D CAD Model - GV2M
RS Stock No. 395-0194
Mfr. Part No.GV2ME32
£119.06
Each
Units
24 → 32 A 3P TeSys 3 kA Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm 3D CAD Model - GV2M
RS Stock No. 818-182
Mfr. Part No.PKZM0-6,3
BrandEaton
£60.84
Each
Units
4 → 6.3 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm 3D CAD Model - PKZM 0
RS Stock No. 351-5375
Mfr. Part No.140M-C2E-B63
£55.40
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
£55.40
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
£55.40
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. 246-4901
Mfr. Part No.3RV1021-4AA10
BrandSiemens
£79.33
Each
Units
11 → 16 A 3P Sirius Innovation 50 kA Screw 690 V - 97mm 45mm 96mm 97 x 45 x 96 mm 3D CAD Model - 3RV1
RS Stock No. 818-176
Mfr. Part No.PKZM0-4
BrandEaton
£60.84
Each
Units
2.5 → 4 A 3P - 60 kA - 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm 3D CAD Model - PKZM 0
RS Stock No. 305-2199
Mfr. Part No.GV2P10
£80.94
Each
Units
4 → 6.3 A 3P TeSys 6 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm 3D CAD Model - GV2P
RS Stock No. 395-0302
Mfr. Part No.GV2ME04
£46.03
Each
Units
0.4 → 0.63 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm 3D CAD Model - GV2M
RS Stock No. 395-0201
Mfr. Part No.GV2ME22
£72.56
Each
Units
20 → 25 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm 3D CAD Model - GV2M
RS Stock No. 818-160
Mfr. Part No.PKZM0-2,5
BrandEaton
£60.84
Each
Units
1.6 → 2.5 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm 3D CAD Model - PKZM 0
RS Stock No. 818-154
Mfr. Part No.PKZM0-1,6
BrandEaton
£60.84
Each
Units
1 → 1.6 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm 3D CAD Model - PKZM 0
RS Stock No. 331-3668
BrandRS PRO
£31.25
Each
Units
10 → 16 A - - - Screw 690 V - 80mm 45mm 73.5mm 80 x 45 x 73.5 mm - MS25 Series XL2000
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