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. 818-126
Mfr. Part No.PKZM0-0,4
BrandEaton
R 1,034.16
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. 305-2183
Mfr. Part No.GV2P08
R 863.42
Each
units
2.5 → 4 A 3P TeSys 8 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS stock no. 492-1535
Mfr. Part No.PKZM01-4
BrandEaton
R 1,069.83
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. 608-8292
Mfr. Part No.GV2L07
R 1,368.87
Each
units
1.6 → 2.5 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS stock no. 755-2700
Mfr. Part No.3RV1041-4FA10
BrandSiemens
R 3,000.00
Each
units
40 A 3P Sirius Innovation 50 kA Screw 690 V ac/dc - 165mm 70mm 174mm 165 x 70 x 174 mm - -
RS stock no. 755-2927
Mfr. Part No.3RV2311-1FC10
BrandSiemens
R 698.00
Each
units
5 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS stock no. 121-6856
BrandRS PRO
R 579.14
Each
units
17 → 23 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. 818-160
Mfr. Part No.PKZM0-2,5
BrandEaton
R 1,240.36
Each
units
1.6 → 2.5 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS stock no. 122-1337
Mfr. Part No.MPW40-3-U040
BrandWEG
R 2,112.52
Each
units
32 → 40 A 3 - 30 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors MPW40
RS stock no. 305-2161
Mfr. Part No.GV2P06
R 863.42
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. 619-4713
Mfr. Part No.PKZM4-63
BrandEaton
R 4,010.78
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. 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. 608-8286
Mfr. Part No.GV2L06
R 1,368.87
Each
units
1 → 1.7 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS stock no. 123-6688
Mfr. Part No.9000-41034-0100400
R 2,073.67
Each
units
1 → 4 A 4 MICO Intelligent - Cage Clamp 24 V dc - 70mm 80mm 90mm 70 x 80 x 90 mm - -
RS stock no. 706-1718
Mfr. Part No.3RV2011-0BA10
BrandSiemens
R 833.30
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. 246-4973
Mfr. Part No.3RV1031-4FA10
BrandSiemens
R 3,174.46
Each
units
28 → 40 A 3P Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm - 3RV1
RS stock no. 706-1774
Mfr. Part No.3RV2011-1AA10
BrandSiemens
R 956.16
Each
units
1.1 → 1.6 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS stock no. 246-4995
Mfr. Part No.3RV1031-4HA10
BrandSiemens
R 3,565.01
Each
units
40 → 50 A 3P Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm - 3RV1
RS stock no. 706-1780
Mfr. Part No.3RV2011-1BA20
BrandSiemens
R 998.60
Each
units
1.4 → 2 A 3P Sirius Innovation 10 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS stock no. 395-0346
Mfr. Part No.GV2ME01
R 1,136.28
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