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. 395-0267
Mfr. Part No.GV2ME07
HK$451.40
Each
units
1.6 → 2.5 A 3P TeSys 3 kA Screw 690 V Manual 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm Motor Protection GV2M
RS Stock No. 706-1784
Mfr. Part No.3RV2011-1CA10
BrandSiemens
HK$561.51
Each
units
1.8 → 2.5 A 3P Sirius Innovation 10 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 875-1119
Mfr. Part No.3RV2031-4PA10
BrandSiemens
HK$1,622.88
Each
units
28 → 36 A 3 Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm Motor Protection 3RV2
RS Stock No. 711-6464
Mfr. Part No.MS132-2.5
BrandABB
HK$740.63
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS Stock No. 243-7167
Mfr. Part No.3RV1011-1HA10
BrandSiemens
HK$639.09
Each
units
5.5 → 8 A 3P Sirius Innovation 50 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 312-5281
Mfr. Part No.PKZM0-4-T
BrandEaton
HK$743.60
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. 818-176
Mfr. Part No.PKZM0-4
BrandEaton
HK$858.14
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. 395-0201
Mfr. Part No.GV2ME22
HK$1,648.34
Each
units
20 → 25 A 3P TeSys 3 kA @ 690 V ac, 4 kA @ 500 V ac, 6 kA @ 440 V ac, 15 kA @ 400/415 V ac, 50 kA @ 230/240 V ac Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm Motor Protection GV2M
RS Stock No. 395-0217
Mfr. Part No.GV2ME20
HK$439.04
Each
units
13 → 18 A 3P TeSys 3 kA Screw 690 V Manual 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm Motor Protection GV2M
RS Stock No. 395-0223
Mfr. Part No.GV2ME16
HK$526.63
Each
units
9 → 14 A 3P TeSys 3 kA Screw 690 V Manual 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm Motor Protection GV2M
RS Stock No. 818-104
Mfr. Part No.PKZM0-0,16
BrandEaton
HK$597.28
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. 492-1513
Mfr. Part No.PKZM01-1.6
BrandEaton
HK$578.06
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. 706-1803
Mfr. Part No.3RV2011-1EA20
BrandSiemens
HK$558.84
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. 212-7955
Mfr. Part No.PKZM0-16
BrandEaton
HK$688.53
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. 875-1122
Mfr. Part No.3RV2031-4VA10
BrandSiemens
HK$1,919.29
Each
units
35 → 45 A 3 Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm Motor Protection 3RV2
RS Stock No. 706-1774
Mfr. Part No.3RV2011-1AA10
BrandSiemens
HK$537.83
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. 243-7101
Mfr. Part No.3RV1011-1BA10
BrandSiemens
HK$639.09
Each
units
1.4 → 2 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
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. 774-0140
Mfr. Part No.PKE12/XTU-4
BrandEaton
HK$1,455.17
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. 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
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