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. 818-132
Mfr. Part No.PKZM0-0,63
BrandEaton
TWD2,607.00
Each
units
0.4 → 0.63 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 246-4967
Mfr. Part No.3RV1031-4EA10
BrandSiemens
TWD6,706.00
Each
units
22 → 32 A 3P Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm - 3RV1
RS Stock No. 818-744
Mfr. Part No.PKZM0-10
BrandEaton
TWD3,418.00
Each
units
6.3 → 10 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 395-0217
Mfr. Part No.GV2ME20
TWD2,122.00
Each
units
13 → 18 A 3P TeSys 3 kA Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 706-1800
Mfr. Part No.3RV2011-1EA10
BrandSiemens
TWD2,196.00
Each
units
2.8 → 4 A 3P Sirius Innovation 6 kA Screw 690 V - 109mm 45mm 91mm 109 x 45 x 91 mm - 3RV2
RS Stock No. 754-6673
Mfr. Part No.3RV1011-1GA15
BrandSiemens
TWD3,087.00
Each
units
6.3 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 90mm 45mm 81mm 90 x 45 x 81 mm - -
RS Stock No. 706-1774
Mfr. Part No.3RV2011-1AA10
BrandSiemens
TWD2,104.00
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. 312-5281
Mfr. Part No.PKZM0-4-T
BrandEaton
TWD3,039.00
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. 312-5269
Mfr. Part No.PKZM0-2,5-T
BrandEaton
TWD3,039.00
Each
units
1.6 → 2.5 A 3P - 150 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 706-1863
Mfr. Part No.3RV2021-4DA10
BrandSiemens
TWD3,249.00
Each
units
20 → 25 A 3P Sirius Innovation 4 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 122-1349
Mfr. Part No.MPW40-3-U020
BrandWEG
TWD2,285.00
Each
units
16 → 20 A 3 - 50 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors MPW40
RS Stock No. 755-2814
Mfr. Part No.3RV1341-4MC10
BrandSiemens
TWD12,577.00
Each
units
100 A 3P Sirius Innovation 50 kA Screw 690 V ac/dc - 165mm 70mm 174mm 165 x 70 x 174 mm - -
RS Stock No. 608-8359
Mfr. Part No.GV2L22
TWD4,812.00
Each
units
16 → 24 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS Stock No. 146-9052
Mfr. Part No.SM2R6300
BrandLovato
TWD6,742.00
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
TWD2,644.00
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. 608-8270
Mfr. Part No.GV2L05
TWD3,038.00
Each
units
1 → 1.7 A 3P TeSys 100 kA Screw 690 V ac Turn 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS Stock No. 146-9053
Mfr. Part No.SM3R7500
BrandLovato
TWD7,585.00
Each
units
55 → 75 A 3 - 50 kA Screw 400 V Rotary Knob 70mm 169mm 165mm 70 x 169 x 165 mm Motor Protection SM3R
RS Stock No. 755-2898
Mfr. Part No.3RV2021-4FA10
BrandSiemens
TWD5,335.00
Each
units
40 A 3P Sirius Innovation 20 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS Stock No. 608-8365
Mfr. Part No.GV2L32
TWD6,206.00
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. 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