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. 755-2902
Mfr. Part No.3RV2021-4NA20
BrandSiemens
R 1,280.00
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. 351-5369
Mfr. Part No.140M-C2E-B40
R 1,316.31
Each
units
2.5 → 4 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
RS stock no. 312-5281
Mfr. Part No.PKZM0-4-T
BrandEaton
R 1,576.97
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. 900-2083
Mfr. Part No.MA0.63UM
BrandAltech
R 1,528.32
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 Motors, Power Supplies, 3 Phase Transformers MA
RS stock no. 875-1122
Mfr. Part No.3RV2031-4VA10
BrandSiemens
R 2,290.00
Each
units
35 → 45 A 3 Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm Motor Protection 3RV2
RS stock no. 136-7848
Mfr. Part No.SM1X1120
BrandLovato
R 138.04
Each
units
5 A 2 - - Screw 300 V - 9mm 80mm 90mm 9 x 80 x 90 mm SM1 Motor Protection Circuit Breakers SM1X
RS stock no. 122-0740
Mfr. Part No.MPW18i-3-U001
BrandWEG
R 830.82
Each
units
1 A 3 - 100 kA/415V Screw 690 V Manual 90mm 45mm 77mm 44.8 x 77 x 97 mm Motors MPW18i
RS stock no. 754-6660
Mfr. Part No.3RV1011-0EA15
BrandSiemens
R 889.00
Each
units
0.4 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 90mm 45mm 81mm 90 x 45 x 81 mm - -
RS stock no. 711-6442
Mfr. Part No.MS132-0.16
BrandABB
R 1,236.57
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS stock no. 492-1737
Mfr. Part No.PKZM01-0.16
BrandEaton
R 1,057.00
Each
units
0.1 → 0.16 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01
New
RS stock no. 196-3572
Mfr. Part No.3VA22255HL420AA0
BrandSiemens
R 43,805.79
Each
units
100 → 250 A 4 Sentron 85 @ 240 V kA Front, Lug 690 V ac Adjustable 140mm 107mm 181mm 140 x 86 x 181 mm Line Protection 3VA2
RS stock no. 755-2814
Mfr. Part No.3RV1341-4MC10
BrandSiemens
R 3,820.00
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. 122-1363
Mfr. Part No.MPW40i-3-U020
BrandWEG
R 1,088.40
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. 899-5192
Mfr. Part No.DC1CU3L
BrandAltech
R 471.49
Each
units
- 1 - 10 kA - - - - - - - - L
RS stock no. 351-5353
Mfr. Part No.140M-C2E-B25
R 1,316.52
Each
units
1.6 → 2.5 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
RS stock no. 875-1119
Mfr. Part No.3RV2031-4PA10
BrandSiemens
R 1,940.00
Each
units
28 → 36 A 3 Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm Motor Protection 3RV2
RS stock no. 136-7863
Mfr. Part No.SM1X18200R
BrandLovato
R 707.02
Each
units
- - - - - - - 200 (Rod)mm - - - SM1R Motor Protection Circuit Breakers SM1X
RS stock no. 124-3118
Mfr. Part No.3RV2321-1KC10
BrandSiemens
R 805.00
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. 608-8523
Mfr. Part No.GV2P21
R 1,220.07
Each
units
17 → 23 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS stock no. 706-1796
Mfr. Part No.3RV2011-1DA10
BrandSiemens
R 1,146.62
Each
units
2.2 → 3.2 A 3P Sirius Innovation 10 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2