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. 136-7845
Mfr. Part No.SM1R3200
BrandLovato
TWD3,342.00
Each
units
24 → 32 A 3 - 25 (Ics) kA, 50 (Icu) kA Screw 690 V Rotary Knob 44.8mm 91.1mm 96.6mm 44.8 x 91.1 x 96.6 mm High IE3 Efficiency Value Motors SM1R
RS Stock No. 608-8573
Mfr. Part No.GV2RT10
TWD3,867.00
Each
units
4 → 6.3 A 3P TeSys - - 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2R
RS Stock No. 900-2119
Mfr. Part No.MA25UM
BrandAltech
TWD3,836.00
Each
units
- 3P - 20 kA - - - - - - - - MA
RS Stock No. 136-7860
Mfr. Part No.SM1X16400
BrandLovato
TWD1,030.00
Each
units
- - - - Screw 400 V ac - 18mm 80mm 90mm 18 x 80 x 90 mm SM1 Motor Protection Circuit Breakers SM1X
RS Stock No. 121-6853
BrandRS PRO
TWD1,037.00
Each
units
6.3 → 10 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. 136-7846
Mfr. Part No.SM1R4000
BrandLovato
TWD4,000.00
Each
units
30 → 40 A 3 - 10 (Ics) kA, 20 (Icu) kA Screw 690 V Rotary Knob 44.8mm 91.1mm 96.6mm 44.8 x 91.1 x 96.6 mm High IE3 Efficiency Value Motors SM1R
RS Stock No. 608-8321
Mfr. Part No.GV2L14
TWD3,418.00
Each
units
5.5 → 8 A, 7 → 10 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS Stock No. 900-3783
Mfr. Part No.P35ULT
BrandAltech
TWD384.00
Each
units
- - - - - - - - - - - Miniature Molded Circuit Breakers -
RS Stock No. 706-1721
Mfr. Part No.3RV2011-0CA10
BrandSiemens
TWD1,836.00
Each
units
0.18 → 0.25 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 899-5177
Mfr. Part No.DC1CU10L
BrandAltech
TWD817.00
Each
units
- 1 - 10 kA - - - - - - - - L
RS Stock No. 445-0336
Mfr. Part No.MS116-1.0
BrandABB
TWD2,275.00
Each
units
0.63 1 A 3P - 50 kA Screw 690 V ac - - - - 45 x 90 x 85.6 mm - MS116
RS Stock No. 121-6854
BrandRS PRO
TWD1,037.00
Each
units
9 → 14 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 Stock No. 774-0146
Mfr. Part No.PKE12/XTU-12
BrandEaton
TWD5,608.00
Each
units
3 → 12 A 3P - 100 kA Screw 690 V ac - 101mm 45mm 102.5mm 101 x 45 x 102.5 mm - PKE
RS Stock No. 608-8337
Mfr. Part No.GV2L16
TWD3,418.00
Each
units
9 → 13 A, 12 → 18 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS Stock No. 608-8589
Mfr. Part No.GV2RT14
TWD4,497.00
Each
units
6 → 10 A 3P TeSys - - 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2R
RS Stock No. 900-3792
Mfr. Part No.P95UB
BrandAltech
TWD1,678.00
Each
units
- - - - - - - - - - - 3 Phase UL1077/508 Busbar P95
RS Stock No. 900-2137
Mfr. Part No.MA6.3UM
BrandAltech
TWD3,179.00
Each
units
- 3P - 42 kA - - - - - - - - MA
RS Stock No. 123-6688
Mfr. Part No.9000-41034-0100400
TWD4,893.00
Each
units
1 → 4 A 4 MICO Intelligent - Cage Clamp 24 V dc - 70mm 80mm 90mm 70 x 80 x 90 mm - -
RS Stock No. 900-2121
Mfr. Part No.MA4.0UM
BrandAltech
TWD3,180.00
Each
units
- 3P - 42 kA - - - - - - - - MA
RS Stock No. 899-5192
Mfr. Part No.DC1CU3L
BrandAltech
TWD817.00
Each
units
- 1 - 10 kA - - - - - - - - L