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. 608-8365
Mfr. Part No.GV2L32
$677.08
Each
units
23 → 32 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS Stock No. 305-2206
Mfr. Part No.GV2P14
$342.70
Each
units
6 → 10 A 3P TeSys 6 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS Stock No. 755-2794
Mfr. Part No.3RV1331-4DC10
BrandSiemens
$378.56
Each
units
25 A 3P Sirius Innovation 50 kA Screw 690 V ac/dc - 140mm 55mm 149mm 140 x 55 x 149 mm - -
RS Stock No. 331-3595
BrandRS PRO
$68.53
Each
units
0.6 → 1 A - - - Screw 690 V - 80mm 45mm 73.5mm 80 x 45 x 73.5 mm MS25 Series XL2000
RS Stock No. 331-3674
BrandRS PRO
$75.05
Each
units
16 → 20 A - - - Screw 690 V - 80mm 45mm 73.5mm 80 x 45 x 73.5 mm MS25 Series XL2000
RS Stock No. 608-8309
Mfr. Part No.GV2L08
$353.41
Each
units
2.5 → 4 A, 4 → 6 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS Stock No. 875-1125
Mfr. Part No.3RV2031-4WA10
BrandSiemens
$459.03
Each
units
42 → 52 A 3 Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm Motor Protection 3RV2
RS Stock No. 413-1574
Mfr. Part No.GV2ME063
$128.03
Each
units
1 → 1.6 A 3P TeSys - Cage Clamp 500 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 608-8343
Mfr. Part No.GV2L20
$464.86
Each
units
12 → 18 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS Stock No. 246-5027
Mfr. Part No.3RV1041-4KA10
BrandSiemens
$676.66
Each
units
57 → 75 A 3P Sirius Innovation 50 kA Screw 690 V - 165mm 70mm 174mm 165 x 70 x 174 mm - 3RV1
RS Stock No. 121-6850
BrandRS PRO
$43.19
Each
units
1.6 → 2.5 A 3 - 100 kA @ 230 V Screw 690 V Automatic 45mm 89.5mm 78.5mm 45 x 89.5 x 78.5 mm Motor Protection Switches MS32
RS Stock No. 305-2228
Mfr. Part No.GV2P20
$359.69
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. 121-6848
BrandRS PRO
$49.94
Each
units
0.63 → 1 A 3 - 100 kA @ 230 V Screw 690 V Automatic 45mm 89.5mm 78.5mm 45 x 89.5 x 78.5 mm Motor Protection Switches MS32
RS Stock No. 331-3646
BrandRS PRO
$67.29
Each
units
4 → 6 A - - - Screw 690 V - 80mm 45mm 73.5mm 80 x 45 x 73.5 mm MS25 Series XL2000
RS Stock No. 445-0342
Mfr. Part No.MS116-1.6
BrandABB
$114.83
Each
units
1 → 1.6 A 3P - 50 kA Screw 690 V ac - - - - 45 x 90 x 85.6 mm - MS116
RS Stock No. 243-7195
Mfr. Part No.3RV1011-1KA10
BrandSiemens
$161.85
Each
units
9 → 12 A 3P Sirius Innovation 50 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 706-1800
Mfr. Part No.3RV2011-1EA10
BrandSiemens
$134.78
Each
units
2.8 → 4 A 3P Sirius Innovation 6 kA Screw 690 V - 109mm 45mm 91mm 109 x 45 x 91 mm - 3RV2
RS Stock No. 755-2703
Mfr. Part No.3RV1041-4HA10
BrandSiemens
$607.16
Each
units
50 A 3P Sirius Innovation 50 kA Screw 690 V ac/dc - 165mm 70mm 174mm 165 x 70 x 174 mm - -
RS Stock No. 706-1740
Mfr. Part No.3RV2011-0GA10
BrandSiemens
$114.67
Each
units
0.45 → 0.63 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 706-1831
Mfr. Part No.3RV2011-1KA10
BrandSiemens
$151.06
Each
units
9 → 12 A 3P Sirius Innovation 6 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
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