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. 136-7832
Mfr. Part No.SM1R0025
BrandLovato
HK$336.75
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. 136-7837
Mfr. Part No.SM1R0250
BrandLovato
HK$423.66
Each
units
1.6 → 2.5 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. 146-9055
Mfr. Part No.SM3R9900
BrandLovato
HK$2,585.59
Each
units
80 → 100 A 3 - 50 kA Screw 400 V Rotary Knob 70mm 169mm 165mm 70 x 169 x 165 mm Motor Protection SM3R
RS Stock No. 136-7867
Mfr. Part No.SM1X3141R
BrandLovato
HK$120.82
Each
units
9 → 25 A - - - - - - - - - - SM1R Motor Protection Circuit Breakers SM1X
RS Stock No. 136-7842
Mfr. Part No.SM1R1800
BrandLovato
HK$493.78
Each
units
13 → 18 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. 136-7833
Mfr. Part No.SM1R0040
BrandLovato
HK$356.55
Each
units
0.25 → 0.4 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. 136-7849
Mfr. Part No.SM1X1202
BrandLovato
HK$64.57
Each
units
10 A 2 - - Screw 690 V - 9mm 80mm 90mm 9 x 80 x 90 mm SM1 Motor Protection Circuit Breakers SM1X
RS Stock No. 136-7869
Mfr. Part No.SM1X3241R
BrandLovato
HK$136.99
Each
units
26 → 38 A - - - - - - - - - - SM1R Motor Protection Circuit Breakers SM1X
RS Stock No. 136-7868
Mfr. Part No.SM1X3142R
BrandLovato
HK$120.82
Each
units
- - - - - - - - - - - SM1R Motor Protection Circuit Breakers SM1X
RS Stock No. 136-7843
Mfr. Part No.SM1R2300
BrandLovato
HK$514.42
Each
units
17 → 23 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. 136-7835
Mfr. Part No.SM1R0100
BrandLovato
HK$382.74
Each
units
0.63 → 1 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. 136-7840
Mfr. Part No.SM1R1000
BrandLovato
HK$474.83
Each
units
6.3 → 10 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. 136-7852
Mfr. Part No.SM1X1311
BrandLovato
HK$125.53
Each
units
10 A 2 - - Screw 690 V - 9mm 80mm 90mm 9 x 80 x 90 mm SM1 Motor Protection Circuit Breakers SM1X
RS Stock No. 146-9052
Mfr. Part No.SM2R6300
BrandLovato
HK$1,955.29
Each
units
46 → 63 A 3 - 50 kA Screw 400 V Rotary Knob 55mm 144.6mm 125mm 55 x 144.6 x 125 mm Motor Protection SM2R
RS Stock No. 136-7844
Mfr. Part No.SM1R2500
BrandLovato
HK$626.07
Each
units
20 → 25 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. 136-7854
Mfr. Part No.SM1X14230
BrandLovato
HK$194.57
Each
units
- - - - Screw 230 V ac - 18mm 80mm 90mm 18 x 80 x 90 mm SM1 Motor Protection Circuit Breakers SM1X
RS Stock No. 136-7836
Mfr. Part No.SM1R0160
BrandLovato
HK$405.55
Each
units
1 → 1.6 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. 136-7841
Mfr. Part No.SM1R1400
BrandLovato
HK$493.78
Each
units
9 → 14 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. 136-7873
Mfr. Part No.SM1Z1710R
BrandLovato
HK$324.20
Each
units
- - - - - - - 100mm 137.8mm 159mm 100 x 137.8x 159 mm SM1P Motor Protection Circuit Breakers, SM1R Black Handle SM1Z
RS Stock No. 136-7848
Mfr. Part No.SM1X1120
BrandLovato
HK$64.70
Each
units
5 A 2 - - Screw 300 V - 9mm 80mm 90mm 9 x 80 x 90 mm SM1 Motor Protection Circuit Breakers SM1X