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. 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. 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. 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. 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. 492-1513
Mfr. Part No.PKZM01-1.6
BrandEaton
HK$462.12
Each
units
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 Stock No. 212-7955
Mfr. Part No.PKZM0-16
BrandEaton
HK$668.48
Each
units
10 → 16 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 818-104
Mfr. Part No.PKZM0-0,16
BrandEaton
HK$503.50
Each
units
0.1 → 0.16 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 818-182
Mfr. Part No.PKZM0-6,3
BrandEaton
HK$723.22
Each
units
4 → 6.3 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 818-176
Mfr. Part No.PKZM0-4
BrandEaton
HK$573.06
Each
units
2.5 → 4 A 3P - 60 kA - 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
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. 866-1303
Mfr. Part No.XTPR004BC1
BrandEaton
HK$1,471.65
Each
units
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 - -
RS Stock No. 818-126
Mfr. Part No.PKZM0-0,4
BrandEaton
HK$477.56
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. 866-1319
Mfr. Part No.PKZM0-12/AK
BrandEaton
HK$1,274.97
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. 619-4707
Mfr. Part No.PKZM4-32
BrandEaton
HK$1,400.00
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. 492-1579
Mfr. Part No.PKZM01-12
BrandEaton
HK$544.13
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. 774-0140
Mfr. Part No.PKE12/XTU-4
BrandEaton
HK$1,260.00
Each
units
1 → 4 A 3P - 100 kA Screw 690 V ac - 101mm 45mm 102.5mm 101 x 45 x 102.5 mm - PKE
RS Stock No. 211-4482
Mfr. Part No.PKZM0-20
BrandEaton
HK$726.13
Each
units
16 → 20 A 3P - 40 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 619-4690
Mfr. Part No.PKZM4-25
BrandEaton
HK$1,194.06
Each
units
16 → 25 A 3P - 60 kA Screw 690 V ac - 140mm 55mm 160mm 140 x 55 x 160 mm - PKZM 4