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 Power Rating
RS Stock No. 243-7123
Mfr. Part No.3RV1011-1DA10
BrandSiemens
$303.09
Each
units
2.2 3.2 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1 -
RS Stock No. 492-1743
Mfr. Part No.PKZM01-16
BrandEaton
$180.90
Each
units
10 16 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
$315.45
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. 413-1580
Mfr. Part No.GV2ME073
$328.94
Each
units
1.6 2.5 A 3P TeSys - Cage Clamp 500 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M -
RS Stock No. 305-2161
Mfr. Part No.GV2P06
$331.32
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. 706-1841
Mfr. Part No.3RV2021-4AA10
BrandSiemens
$147.02
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. 492-1557
Mfr. Part No.PKZM01-10
BrandEaton
$189.22
Each
units
6.3 10 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01 -
RS Stock No. 395-0251
Mfr. Part No.GV2ME08
$292.58
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. 305-2212
Mfr. Part No.GV2P16
$393.36
Each
units
9 14 A 3P TeSys 6 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P -
RS Stock No. 711-6480
Mfr. Part No.MS132-25
BrandABB
$209.73
Each
units
- 3P - - - 690 V ac - - - - - - MS132 11 kW
RS Stock No. 413-1603
Mfr. Part No.GV2ME103
$334.86
Each
units
4 6.3 A 3P TeSys 50 kA Cage Clamp 500 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M -
RS Stock No. 305-2199
Mfr. Part No.GV2P10
$302.68
Each
units
4 6.3 A 3P TeSys 6 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P -
RS Stock No. 706-1822
Mfr. Part No.3RV2011-1HA10
BrandSiemens
$121.22
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. 608-8416
Mfr. Part No.GV2LE14
$245.12
Each
units
10 A 3P TeSys 3 kA Screw 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2L -
RS Stock No. 305-2228
Mfr. Part No.GV2P20
$236.89
Each
units
13 18 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P -
RS Stock No. 818-132
Mfr. Part No.PKZM0-0,63
BrandEaton
$128.07
Each
units
0.4 0.63 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0 -
RS Stock No. 492-1541
Mfr. Part No.PKZM01-63
BrandEaton
$130.36
Each
units
4 6.3 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01 -
RS Stock No. 818-160
Mfr. Part No.PKZM0-2,5
BrandEaton
$153.16
Each
units
1.6 2.5 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0 -
RS Stock No. 124-3119
Mfr. Part No.3RV2321-4AC10
BrandSiemens
$132.49
Each
units
Maximum of 16 A 3 Sirius Innovation 55 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. 246-5027
Mfr. Part No.3RV1041-4KA10
BrandSiemens
$635.46
Each
units
57 75 A 3P Sirius Innovation 50 kA Screw 690 V - 165mm 70mm 174mm 165 x 70 x 174 mm - 3RV1 -
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