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. 127-1496
Mfr. Part No.3RV2021-0KA10
BrandSiemens
TWD2,191.00
Each
units
0.9 → 1.25 A 3 Sirius Innovation 100 kA @ 690 V ac Screw 690 V ac Manual 45mm 96.9mm 97mm 45 x 96.9 x 97 mm Three Phase Motors 3RV2
RS Stock No. 734-9037
Mfr. Part No.A9E21180
TWD8,496.00
Each
units
8 A 2 Acti 9 - - 400 V ac - - - - - - iCT
RS Stock No. 122-1342
Mfr. Part No.MPW40-3-C063
BrandWEG
TWD1,622.00
Each
units
0.4 → 0.63 A 3 - 100 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors MPW40
RS Stock No. 146-9055
Mfr. Part No.SM3R9900
BrandLovato
TWD8,916.00
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. 706-1796
Mfr. Part No.3RV2011-1DA10
BrandSiemens
TWD2,196.00
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
RS Stock No. 123-6689
Mfr. Part No.9000-41034-0100600
TWD5,468.00
Each
units
1 A, 2 A, 4 A, 6 A 4 MICO Intelligent - Cage Clamp 24 V dc - 70mm 80mm 90mm 70 x 80 x 90 mm - -
RS Stock No. 136-7872
Mfr. Part No.SM1X9050
BrandLovato
TWD958.00
Each
units
63 A - - - Screw - - - - - - All Busbar, SM1R Motor Protection Circuit Breakers SM1X
RS Stock No. 797-5572
Mfr. Part No.EMS-ROS-T-2.4-24VDC
BrandEaton
TWD6,244.00
Each
units
0.18 → 2.4 A 1 ATEX 3 A Screw 24 V dc, 550 V ac Manual 123.5mm 157mm 30mm 123.5 x 157 x 30 mm - -
RS Stock No. 243-7000
Mfr. Part No.3RV1011-0CA10
BrandSiemens
TWD2,077.00
Each
units
0.18 → 0.25 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 122-1354
Mfr. Part No.MPW40i-3-D004
BrandWEG
TWD1,486.00
Each
units
0.4 A 3 - 100 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors MPW40i
RS Stock No. 305-2228
Mfr. Part No.GV2P20
TWD6,286.00
Each
units
13 → 18 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS Stock No. 136-7847
Mfr. Part No.SM1X1111
BrandLovato
TWD274.00
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. 246-4989
Mfr. Part No.3RV1031-4GA10
BrandSiemens
TWD8,703.00
Each
units
36 → 45 A 3P Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm - 3RV1
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. 243-6984
Mfr. Part No.3RV1011-0AA10
BrandSiemens
TWD2,077.00
Each
units
0.11 → 0.16 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 122-1363
Mfr. Part No.MPW40i-3-U020
BrandWEG
TWD2,076.00
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. 866-1319
Mfr. Part No.PKZM0-12/AK
BrandEaton
TWD2,984.00
Each
units
8 → 12 A 3P - 60 kA Screw 690 V ac Manual 45mm 93mm 94mm 45 x 93 x 94 mm - PKZM 0
RS Stock No. 121-6848
BrandRS PRO
TWD907.00
Each
units
0.63 → 1 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. 124-3112
Mfr. Part No.3RV2321-1BC10
BrandSiemens
TWD2,319.00
Each
units
Maximum of 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. 755-2915
Mfr. Part No.3RV2311-1DC10
BrandSiemens
TWD2,232.00
Each
units
3.2 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -