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. 124-3102
Mfr. Part No.3RV2021-1EA10
BrandSiemens
HK$585.86
Each
units
2.8 → 4 A 3 Sirius Innovation 100 kA @ 400 V ac Screw 690 V ac Manual 45mm 96.9mm 97mm 45 x 97 x 96.9 mm Three Phase Motors SRV2
New
RS Stock No. 201-3465
Mfr. Part No.MPW80i-3-U065
BrandWEG
HK$2,257.63
Each
units
65 A 3 MPW 8 A Box 690 V - - - - - - -
RS Stock No. 608-8387
Mfr. Part No.GV2LE07
HK$609.20
Each
units
2.5 A 3P TeSys 3 kA Screw 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2L
RS Stock No. 866-1316
Mfr. Part No.PKZM0-10/AK
BrandEaton
HK$714.52
Each
units
6.3 → 10 A 3P - 60 kA Screw 690 V ac Manual 45mm 93mm 94mm 45 x 93 x 94 mm - PKZM 0
RS Stock No. 331-3573
BrandRS PRO
HK$293.05
Each
units
0.24 → 0.4 A - - - Screw 690 V - 80mm 45mm 73.5mm 80 x 45 x 73.5 mm MS25 Series XL2000
RS Stock No. 744-6891
Mfr. Part No.GV2RT21
HK$1,384.24
Each
units
17 → 23 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2R
RS Stock No. 755-2905
Mfr. Part No.3RV2021-4PA10
BrandSiemens
HK$1,251.08
Each
units
36 A 3P Sirius Innovation 20 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS Stock No. 900-2128
Mfr. Part No.MA32UM
BrandAltech
HK$1,066.75
Each
units
- 3P - 20 kA - - - - - - - - MA
RS Stock No. 866-1537
Mfr. Part No.XTPR1P6BC1
BrandEaton
HK$714.52
Each
units
1 → 1.6 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. 711-6468
Mfr. Part No.MS132-4.0
BrandABB
HK$740.63
Each
units
2.5 → 4 A 3P - 100 kA Screw 690 V ac - - - - 45 x 90 x 87.75 mm - MS132
New
RS Stock No. 201-3459
Mfr. Part No.MPW80-3-U040
BrandWEG
HK$1,964.04
Each
units
40 A 3 MPW 8 A Box 690 V - - - - - - -
RS Stock No. 305-2206
Mfr. Part No.GV2P14
HK$840.00
Each
units
6 → 10 A 3P TeSys 6 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS Stock No. 706-1730
Mfr. Part No.3RV2011-0EA10
BrandSiemens
HK$470.07
Each
units
0.28 → 0.4 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 243-7123
Mfr. Part No.3RV1011-1DA10
BrandSiemens
HK$639.09
Each
units
2.2 → 3.2 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 123-6694
Mfr. Part No.9000-41042-0401000
HK$865.64
Each
units
4 A, 6 A, 8 A, 10 A 2 MICO Intelligent - Cage Clamp 24 V dc - 36mm 80mm 90mm 36 x 80 x 90 mm - -
RS Stock No. 706-1724
Mfr. Part No.3RV2011-0CA20
BrandSiemens
HK$446.25
Each
units
0.18 → 0.25 A 3P Sirius Innovation 100 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS Stock No. 608-8365
Mfr. Part No.GV2L32
HK$1,578.72
Each
units
23 → 32 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS Stock No. 121-6845
BrandRS PRO
HK$231.81
Each
units
0.16 → 0.25 A 3 - 100 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. 706-1718
Mfr. Part No.3RV2011-0BA10
BrandSiemens
HK$387.47
Each
units
0.14 → 0.2 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 243-7016
Mfr. Part No.3RV1011-0DA10
BrandSiemens
HK$527.24
Each
units
0.22 → 0.32 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1