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. 400-1439
Mfr. Part No.GV2ME21
HK$682.72
Each
units
17 → 23 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. 121-6856
BrandRS PRO
HK$260.07
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. 395-0239
Mfr. Part No.GV2ME14
HK$428.81
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. 492-1529
Mfr. Part No.PKZM01-2,5
BrandEaton
HK$467.48
Each
units
1.6 → 2.5 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01
RS Stock No. 312-5269
Mfr. Part No.PKZM0-2,5-T
BrandEaton
HK$607.11
Each
units
1.6 → 2.5 A 3P - 150 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 818-160
Mfr. Part No.PKZM0-2,5
BrandEaton
HK$539.78
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. 331-3668
BrandRS PRO
HK$346.61
Each
units
10 → 16 A - - - Screw 690 V - 80mm 45mm 73.5mm 80 x 45 x 73.5 mm MS25 Series XL2000
RS Stock No. 312-5360
Mfr. Part No.PKZM0-16-T
BrandEaton
HK$702.97
Each
units
10 → 16 A 3P - 50 kA Screw 690 V ac - 93mm 45mm 86mm 93 x 45 x 86 mm - PKZM 0
RS Stock No. 395-0289
Mfr. Part No.GV2ME06
HK$519.89
Each
units
1 → 1.6 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 818-744
Mfr. Part No.PKZM0-10
BrandEaton
HK$827.66
Each
units
6.3 → 10 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 395-0245
Mfr. Part No.GV2ME10
HK$519.89
Each
units
4 → 6.3 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. 706-1863
Mfr. Part No.3RV2021-4DA10
BrandSiemens
HK$766.50
Each
units
20 → 25 A 3P Sirius Innovation 4 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 818-148
Mfr. Part No.PKZM0-1
BrandEaton
HK$573.06
Each
units
0.63 → 1 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 413-1574
Mfr. Part No.GV2ME063
HK$600.00
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. 395-0251
Mfr. Part No.GV2ME08
HK$379.37
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. 706-1774
Mfr. Part No.3RV2011-1AA10
BrandSiemens
HK$436.72
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. 312-5281
Mfr. Part No.PKZM0-4-T
BrandEaton
HK$607.11
Each
units
2.5 → 4 A 3P - 150 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 395-0223
Mfr. Part No.GV2ME16
HK$408.82
Each
units
9 → 14 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. 706-1803
Mfr. Part No.3RV2011-1EA20
BrandSiemens
HK$535.50
Each
units
2.8 → 4 A 3P Sirius Innovation 6 kA Cage Clamp 690 V - 109mm 45mm 91mm 109 x 45 x 91 mm - 3RV2
RS Stock No. 243-7167
Mfr. Part No.3RV1011-1HA10
BrandSiemens
HK$572.09
Each
units
5.5 → 8 A 3P Sirius Innovation 50 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
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