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庫存編號 400-1439
製造零件編號GV2ME21
HK$682.72
單位
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庫存編號 121-6856
BrandRS PRO
HK$260.07
單位
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庫存編號 492-1529
製造零件編號PKZM01-2,5
BrandEaton
HK$467.48
單位
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庫存編號 395-0239
製造零件編號GV2ME14
HK$428.81
單位
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庫存編號 312-5269
製造零件編號PKZM0-2,5-T
BrandEaton
HK$607.11
單位
1.6 → 2.5 A 3P - 150 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS庫存編號 818-160
製造零件編號PKZM0-2,5
BrandEaton
HK$539.78
單位
1.6 → 2.5 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS庫存編號 331-3668
BrandRS PRO
HK$346.61
單位
10 → 16 A - - - Screw 690 V - 80mm 45mm 73.5mm 80 x 45 x 73.5 mm MS25 Series XL2000
RS庫存編號 312-5360
製造零件編號PKZM0-16-T
BrandEaton
HK$702.97
單位
10 → 16 A 3P - 50 kA Screw 690 V ac - 93mm 45mm 86mm 93 x 45 x 86 mm - PKZM 0
RS庫存編號 706-1863
製造零件編號3RV2021-4DA10
BrandSiemens
HK$766.50
單位
20 → 25 A 3P Sirius Innovation 4 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS庫存編號 818-148
製造零件編號PKZM0-1
BrandEaton
HK$573.06
單位
0.63 → 1 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS庫存編號 395-0251
製造零件編號GV2ME08
HK$379.37
單位
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庫存編號 395-0289
製造零件編號GV2ME06
HK$519.89
單位
1 → 1.6 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS庫存編號 818-744
製造零件編號PKZM0-10
BrandEaton
HK$827.66
單位
6.3 → 10 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS庫存編號 395-0245
製造零件編號GV2ME10
HK$519.89
單位
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庫存編號 413-1574
製造零件編號GV2ME063
HK$600.00
單位
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庫存編號 818-176
製造零件編號PKZM0-4
BrandEaton
HK$573.06
單位
2.5 → 4 A 3P - 60 kA - 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS庫存編號 706-1774
製造零件編號3RV2011-1AA10
BrandSiemens
HK$436.72
單位
1.1 → 1.6 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS庫存編號 875-1119
製造零件編號3RV2031-4PA10
BrandSiemens
HK$1,517.10
單位
28 → 36 A 3 Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm Motor Protection 3RV2
RS庫存編號 312-5281
製造零件編號PKZM0-4-T
BrandEaton
HK$607.11
單位
2.5 → 4 A 3P - 150 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS庫存編號 706-1784
製造零件編號3RV2011-1CA10
BrandSiemens
HK$455.73
單位
1.8 → 2.5 A 3P Sirius Innovation 10 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2