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 492-1529
製造零件編號PKZM01-2,5
BrandEaton
HK$468.52
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 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$540.00
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 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 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 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 212-7955
製造零件編號PKZM0-16
BrandEaton
HK$668.48
單位
10 → 16 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS庫存編號 818-182
製造零件編號PKZM0-6,3
BrandEaton
HK$573.06
單位
4 → 6.3 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
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 492-1513
製造零件編號PKZM01-1.6
BrandEaton
HK$462.12
單位
1 → 1.6 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 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 818-104
製造零件編號PKZM0-0,16
BrandEaton
HK$503.50
單位
0.1 → 0.16 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS庫存編號 866-1322
製造零件編號XTPR020BC1
BrandEaton
HK$1,757.51
單位
16 → 20 A 3P - 25 A@ 250 V dc, 32 A@ 690 V ac Screw 690 V ac Manual 45mm 93mm 94mm 45 x 93 x 94 mm - -
RS庫存編號 818-154
製造零件編號PKZM0-1,6
BrandEaton
HK$573.06
單位
1 → 1.6 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS庫存編號 312-5297
製造零件編號PKZM0-6,3-T
BrandEaton
HK$594.45
單位
4 → 6.3 A 3P - 150 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS庫存編號 774-0140
製造零件編號PKE12/XTU-4
BrandEaton
HK$1,260.00
單位
1 → 4 A 3P - 100 kA Screw 690 V ac - 101mm 45mm 102.5mm 101 x 45 x 102.5 mm - PKE
RS庫存編號 312-5310
製造零件編號PKZM0-20-T
BrandEaton
HK$756.22
單位
16 → 20 A 3P - 50 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS庫存編號 212-7961
製造零件編號PKZM0-25
BrandEaton
HK$1,020.49
單位
20 → 25 A 3P - 40 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS庫存編號 866-1319
製造零件編號PKZM0-12/AK
BrandEaton
HK$1,593.71
單位
8 → 12 A 3P - 60 kA Screw 690 V ac Manual 45mm 93mm 94mm 45 x 93 x 94 mm - PKZM 0
RS庫存編號 866-1303
製造零件編號XTPR004BC1
BrandEaton
HK$1,471.65
單位
2.5 → 4 A 3P - 25 A@ 250 V dc, 32 A@ 690 V ac Screw 690 V ac Manual 45mm 93mm 94mm 45 x 93 x 94 mm - -