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. 866-1319
Mfr. Part No.PKZM0-12/AK
BrandEaton
HK$777.68
Each
units
8 → 12 A 3P - 60 kA Screw 690 V ac Manual 45mm 93mm 94mm 45 x 93 x 94 mm - PKZM 0
RS Stock No. 619-4690
Mfr. Part No.PKZM4-25
BrandEaton
HK$1,319.83
Each
units
16 → 25 A 3P - 60 kA Screw 690 V ac - 140mm 55mm 160mm 140 x 55 x 160 mm - PKZM 4
RS Stock No. 212-7961
Mfr. Part No.PKZM0-25
BrandEaton
HK$1,020.49
Each
units
20 → 25 A 3P - 40 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 413-1619
Mfr. Part No.GV2ME143
HK$1,239.31
Each
units
6 → 10 A 3P TeSys 10 kA Cage Clamp 500 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 706-1831
Mfr. Part No.3RV2011-1KA10
BrandSiemens
HK$626.34
Each
units
9 → 12 A 3P Sirius Innovation 6 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 331-3674
BrandRS PRO
HK$395.44
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. 246-5011
Mfr. Part No.3RV1041-4JA10
BrandSiemens
HK$1,666.69
Each
units
45 → 63 A 3P Sirius Innovation 50 kA Screw 690 V - 165mm 70mm 174mm 165 x 70 x 174 mm - 3RV1
RS Stock No. 243-7088
Mfr. Part No.3RV1011-0KA10
BrandSiemens
HK$605.52
Each
units
0.9 → 1.25 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 413-1625
Mfr. Part No.GV2ME163
HK$1,840.35
Each
units
9 → 14 A 3P TeSys 6 kA Cage Clamp 500 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 706-1787
Mfr. Part No.3RV2011-1BA10
BrandSiemens
HK$558.84
Each
units
1.4 → 2 A 3P Sirius Innovation 10 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 312-5310
Mfr. Part No.PKZM0-20-T
BrandEaton
HK$923.78
Each
units
16 → 20 A 3P - 50 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 608-8309
Mfr. Part No.GV2L08
HK$1,940.21
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. 492-1579
Mfr. Part No.PKZM01-12
BrandEaton
HK$680.68
Each
units
10 → 12 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01
RS Stock No. 492-1484
Mfr. Part No.PKZM01-04
BrandEaton
HK$394.28
Each
units
0.25 → 0.4 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01
RS Stock No. 413-1653
Mfr. Part No.GV2ME223
HK$2,099.46
Each
units
20 → 25 A 3P TeSys 4 kA Cage Clamp 500 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 121-6855
BrandRS PRO
HK$287.93
Each
units
13 → 18 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. 818-154
Mfr. Part No.PKZM0-1,6
BrandEaton
HK$716.94
Each
units
1 → 1.6 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 818-126
Mfr. Part No.PKZM0-0,4
BrandEaton
HK$597.28
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. 619-4707
Mfr. Part No.PKZM4-32
BrandEaton
HK$1,570.14
Each
units
25 → 32 A 3P - 60 kA Screw 690 V ac - 140mm 55mm 160mm 140 x 55 x 160 mm - PKZM 4
RS Stock No. 413-1596
Mfr. Part No.GV2ME083
HK$1,373.91
Each
units
2.5 → 4 A 3P TeSys - Cage Clamp 500 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
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