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. 121-6853
BrandRS PRO
TWD1,037.00
Each
units
6.3 → 10 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. 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. 711-6474
Mfr. Part No.MS132-16
BrandABB
TWD3,437.00
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS Stock No. 212-7961
Mfr. Part No.PKZM0-25
BrandEaton
TWD3,690.00
Each
units
20 → 25 A 3P - 40 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 900-7079
Mfr. Part No.RP4430
BrandAltech
TWD8,779.00
Each
units
- 4 - 1250 A - - - - - - - - RP
RS Stock No. 899-5228
Mfr. Part No.DC1DU4L
BrandAltech
TWD817.00
Each
units
- 1 - 10 kA - - - - - - - - L
RS Stock No. 413-1619
Mfr. Part No.GV2ME143
TWD3,103.00
Each
units
6 → 10 A 3P TeSys 10 kA Cage Clamp 500 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 246-4894
Mfr. Part No.3RV1021-1KA10
BrandSiemens
TWD3,290.00
Each
units
9 → 12.5 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 96mm 97 x 45 x 96 mm - 3RV1
RS Stock No. 866-1303
Mfr. Part No.XTPR004BC1
BrandEaton
TWD2,742.00
Each
units
2.5 → 4 A 3P - 25 A@ 250 V dc, 32 A@ 690 V ac Screw 690 V ac Manual 45mm 93mm 94mm 45 x 93 x 94 mm - -
RS Stock No. 395-0302
Mfr. Part No.GV2ME04
TWD1,765.00
Each
units
0.4 → 0.63 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 492-1541
Mfr. Part No.PKZM01-63
BrandEaton
TWD1,776.00
Each
units
4 → 6.3 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01
RS Stock No. 755-2810
Mfr. Part No.3RV1341-4LC10
BrandSiemens
TWD11,355.00
Each
units
90 A 3P Sirius Innovation 50 kA Screw 690 V ac/dc - 165mm 70mm 174mm 165 x 70 x 174 mm - -
RS Stock No. 395-0223
Mfr. Part No.GV2ME16
TWD2,122.00
Each
units
9 → 14 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. 608-8343
Mfr. Part No.GV2L20
TWD3,418.00
Each
units
12 → 18 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS Stock No. 124-3105
Mfr. Part No.3RV2021-1JA10
BrandSiemens
TWD2,560.00
Each
units
7 → 10 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. 706-1803
Mfr. Part No.3RV2011-1EA20
BrandSiemens
TWD2,196.00
Each
units
2.8 → 4 A 3P Sirius Innovation 6 kA Cage Clamp 690 V - 109mm 45mm 91mm 109 x 45 x 91 mm - 3RV2
RS Stock No. 900-2099
Mfr. Part No.MA10UM
BrandAltech
TWD3,179.00
Each
units
- 3P - 14 kA - - - - - - - - MA
RS Stock No. 755-2823
Mfr. Part No.3RV1342-4FC10
BrandSiemens
TWD14,783.00
Each
units
40 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 165mm 70mm 174mm 165 x 70 x 174 mm - -
RS Stock No. 608-8337
Mfr. Part No.GV2L16
TWD3,418.00
Each
units
9 → 13 A, 12 → 18 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
New
RS Stock No. 196-3580
Mfr. Part No.3VA61155HL312AA0
BrandSiemens
TWD81,457.00
Each
units
60 → 150 A 3 Sentron 85 @ 240 V kA - 600 V ac - 105mm 107mm 198mm 105 x 86 x 198 mm System Protection 3VA6