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. 755-2915
Mfr. Part No.3RV2311-1DC10
BrandSiemens
€64.53
Each
units
3.2 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS Stock No. 445-0392
Mfr. Part No.MS116-10
BrandABB
€73.39
Each
units
- 3P - - - 690 V ac - - - - - - MS116
RS Stock No. 774-0143
Mfr. Part No.PKE12/XTU-1,2
BrandEaton
€142.89
Each
units
0.3 → 1.2 A 3P - 100 kA Screw 690 V ac - 101mm 45mm 102.5mm 101 x 45 x 102.5 mm - PKE
RS Stock No. 136-7863
Mfr. Part No.SM1X18200R
BrandLovato
€40.08
Each
units
- - - - - - - 200 (Rod)mm - - - SM1R Motor Protection Circuit Breakers SM1X
RS Stock No. 122-1352
Mfr. Part No.MPW40i-3-C016
BrandWEG
€42.96
Each
units
0.16 A 3 - 100 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors MPW40i
RS Stock No. 136-7832
Mfr. Part No.SM1R0025
BrandLovato
€41.11
Each
units
0.16 → 0.25 A 3 - 100 (Ics) kA, 100 (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. 122-1364
Mfr. Part No.MPW40i-3-U025
BrandWEG
€71.27
Each
units
25 A 3 - 50 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors MPW40i
RS Stock No. 124-3097
Mfr. Part No.3RV2011-1BA15
BrandSiemens
€78.23
Each
units
1.4 → 2 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
RS Stock No. 900-7072
Mfr. Part No.RP4330
BrandAltech
€169.52
Each
units
- 4 - 1250 A - - - - - - - - RP
RS Stock No. 136-7839
Mfr. Part No.SM1R0650
BrandLovato
€51.73
Each
units
4 → 6.5 A 3 - 100 (Ics) kA, 100 (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. 900-2083
Mfr. Part No.MA0.63UM
BrandAltech
€85.80
Each
units
Maximum of 0.63 A 3 - 42 kA Cage Clamp 480Y/277 V ac Manual 52.5mm 89.5mm 74mm 52.5 x 89.5 x 74 mm 3 Phase Transformers, Motors, Power Supplies MA
RS Stock No. 755-2902
Mfr. Part No.3RV2021-4NA20
BrandSiemens
€118.91
Each
units
28 A 3P Sirius Innovation 55 kA Cage Clamp 690 V - 119mm 45mm 91mm 119 x 45 x 91 mm - -
RS Stock No. 619-4713
Mfr. Part No.PKZM4-63
BrandEaton
€187.25
Each
units
55 → 65 A 3P - 60 kA Screw 690 V ac - 140mm 55mm 160mm 140 x 55 x 160 mm - PKZM 4
RS Stock No. 899-5246
Mfr. Part No.DC2CU2L
BrandAltech
€47.24
Each
units
Maximum of 2 A 2 - 10 kA Screw 250 V dc Manual 35mm 109mm 66.5mm 35 x 109 x 66.5 mm - L
RS Stock No. 124-3118
Mfr. Part No.3RV2321-1KC10
BrandSiemens
€74.36
Each
units
Maximum of 12.5 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
RS Stock No. 900-7069
Mfr. Part No.RP4203
BrandAltech
€149.83
Each
units
- 4 - 1250 A - - - - - - - - RP
RS Stock No. 755-2911
Mfr. Part No.3RV2311-1CC10
BrandSiemens
€64.53
Each
units
2.5 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS Stock No. 122-1363
Mfr. Part No.MPW40i-3-U020
BrandWEG
€60.00
Each
units
20 A 3 - 50 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors MPW40i
RS Stock No. 122-0747
Mfr. Part No.MPW18i-3-U018
BrandWEG
€59.01
Each
units
18 A 3 - 10 kA/415V Screw 690 V Manual 90mm 45mm 77mm 44.8 x 77 x 97 mm Motors MPW18i
RS Stock No. 755-2898
Mfr. Part No.3RV2021-4FA10
BrandSiemens
€154.23
Each
units
40 A 3P Sirius Innovation 20 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
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