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. 445-0358
Mfr. Part No.MS116-2.5
BrandABB
R 1,215.48
Each
units
- 3P - - - 690 V ac - - - - - - MS116
RS stock no. 121-6858
BrandRS PRO
R 852.79
Each
units
25 → 32 A 3 - 25 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. 124-3122
Mfr. Part No.3RV2321-4DC10
BrandSiemens
R 983.00
Each
units
Maximum of 25 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. 305-2177
Mfr. Part No.GV2P07
R 997.61
Each
units
1.6 → 2.5 A 3P TeSys 8 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS stock no. 818-126
Mfr. Part No.PKZM0-0,4
BrandEaton
R 1,201.49
Each
units
0.25 → 0.4 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS stock no. 608-8371
Mfr. Part No.GV2LE06
R 1,183.21
Each
units
1.6 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2L
RS stock no. 706-1879
Mfr. Part No.3RV2021-4EA20
BrandSiemens
R 2,123.44
Each
units
27 → 32 A 3P Sirius Innovation 4 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS stock no. 124-3120
Mfr. Part No.3RV2321-4BC10
BrandSiemens
R 810.00
Each
units
Maximum of 20 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. 711-6468
Mfr. Part No.MS132-4.0
BrandABB
R 1,422.98
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS stock no. 706-1829
Mfr. Part No.3RV2011-1JA10
BrandSiemens
R 1,280.89
Each
units
7 → 10 A 3P Sirius Innovation 6 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS stock no. 395-0346
Mfr. Part No.GV2ME01
R 1,264.69
Each
units
0.1 → 0.16 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS stock no. 123-6691
Mfr. Part No.9000-41034-0401005
R 2,770.22
Each
units
4 A, 6 A, 8 A, 10 A 4 - - Cage Clamp 24 V dc - 70mm 80mm 90mm 70 x 80 x 90 mm - -
RS stock no. 754-6673
Mfr. Part No.3RV1011-1GA15
BrandSiemens
R 1,020.00
Each
units
6.3 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 90mm 45mm 81mm 90 x 45 x 81 mm - -
RS stock no. 619-4713
Mfr. Part No.PKZM4-63
BrandEaton
R 4,671.75
Each
units
55 → 65 A 3P - 60 kA Screw 690 V ac - 140mm 55mm 160mm 140 x 55 x 160 mm - PKZM 4
RS stock no. 608-8539
Mfr. Part No.GV2P22
R 1,380.24
Each
units
20 → 25 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS stock no. 608-8595
Mfr. Part No.GV2RT16
R 2,217.92
Each
units
9 → 14 A 3P TeSys - - 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2R
RS stock no. 755-2915
Mfr. Part No.3RV2311-1DC10
BrandSiemens
R 698.00
Each
units
3.2 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS stock no. 755-2823
Mfr. Part No.3RV1342-4FC10
BrandSiemens
R 4,480.00
Each
units
40 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 165mm 70mm 174mm 165 x 70 x 174 mm - -
RS stock no. 706-1718
Mfr. Part No.3RV2011-0BA10
BrandSiemens
R 810.65
Each
units
0.14 → 0.2 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS stock no. 706-1728
Mfr. Part No.3RV2011-0DA10
BrandSiemens
R 962.72
Each
units
0.22 → 0.32 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2