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. 395-0223
Mfr. Part No.GV2ME16
MYR325.41
Each
units
9 → 14 A 3P TeSys 3 kA Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 734-9037
Mfr. Part No.A9E21180
MYR1,327.74
Each
units
8 A 2 Acti 9 - - 400 V ac - - - - - - iCT
RS Stock No. 492-1535
Mfr. Part No.PKZM01-4
BrandEaton
MYR284.15
Each
units
2.5 → 4 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01
RS Stock No. 395-0239
Mfr. Part No.GV2ME14
MYR410.60
Each
units
6 → 10 A 3P TeSys 3 kA Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 774-0159
Mfr. Part No.PKE32
BrandEaton
MYR308.27
Each
units
8 → 32 A 3P - 100 kA Screw 690 V ac - 101mm 45mm 102.5mm 101 x 45 x 102.5 mm - PKE
RS Stock No. 395-0245
Mfr. Part No.GV2ME10
MYR392.88
Each
units
4 → 6.3 A 3P TeSys 3 kA Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 212-7955
Mfr. Part No.PKZM0-16
BrandEaton
MYR542.52
Each
units
10 → 16 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 900-7050
Mfr. Part No.RP2203
BrandAltech
MYR567.59
Each
units
- 2 - 1250 A - - - - - - - - RP
RS Stock No. 818-744
Mfr. Part No.PKZM0-10
BrandEaton
MYR392.09
Each
units
6.3 → 10 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 395-0201
Mfr. Part No.GV2ME22
MYR371.15
Each
units
20 → 25 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 211-4482
Mfr. Part No.PKZM0-20
BrandEaton
MYR520.08
Each
units
16 → 20 A 3P - 40 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 243-7145
Mfr. Part No.3RV1011-1FA10
BrandSiemens
MYR309.32
Each
units
3.5 → 5 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 395-0217
Mfr. Part No.GV2ME20
MYR457.20
Each
units
13 → 18 A 3P TeSys 3 kA Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 395-0251
Mfr. Part No.GV2ME08
MYR324.60
Each
units
2.5 → 4 A 3P TeSys 3 kA Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 246-5033
Mfr. Part No.3RV1041-4LA10
BrandSiemens
MYR1,207.39
Each
units
70 → 90 A 3P Sirius Innovation 50 kA Screw 690 V - 165mm 70mm 174mm 165 x 70 x 174 mm - 3RV1
RS Stock No. 305-2161
Mfr. Part No.GV2P06
MYR489.52
Each
units
1 → 1.6 A 3P TeSys 100 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS Stock No. 246-4894
Mfr. Part No.3RV1021-1KA10
BrandSiemens
MYR387.14
Each
units
9 → 12.5 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 96mm 97 x 45 x 96 mm - 3RV1
RS Stock No. 400-1439
Mfr. Part No.GV2ME21
MYR409.46
Each
units
17 → 23 A 3P TeSys 3 kA Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 706-1841
Mfr. Part No.3RV2021-4AA10
BrandSiemens
MYR323.72
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. 395-0289
Mfr. Part No.GV2ME06
MYR360.18
Each
units
1 → 1.6 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
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