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. 706-1762
Mfr. Part No.3RV2011-0KA10
BrandSiemens
$117.25
Each
units
0.9 → 1.25 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 875-1125
Mfr. Part No.3RV2031-4WA10
BrandSiemens
$393.32
Each
units
42 → 52 A 3 Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm Motor Protection 3RV2
RS Stock No. 608-8422
Mfr. Part No.GV2LE16
$313.74
Each
units
14 A 3P TeSys 3 kA Screw 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2L
RS Stock No. 754-6676
Mfr. Part No.3RV1011-1DA15
BrandSiemens
$157.76
Each
units
3.2 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 90mm 45mm 81mm 90 x 45 x 81 mm - -
RS Stock No. 706-1838
Mfr. Part No.3RV2011-1JA20
BrandSiemens
$137.22
Each
units
7 → 10 A 3P Sirius Innovation 6 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 706-1825
Mfr. Part No.3RV2011-1HA20
BrandSiemens
$122.32
Each
units
5.5 → 8 A 3P Sirius Innovation 6 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 492-1507
Mfr. Part No.PKZM01-1
BrandEaton
$129.84
Each
units
0.63 → 1 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01
RS Stock No. 711-6477
Mfr. Part No.MS132-6.3
BrandABB
$148.75
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS Stock No. 243-7145
Mfr. Part No.3RV1011-1FA10
BrandSiemens
$139.29
Each
units
3.5 → 5 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 246-4967
Mfr. Part No.3RV1031-4EA10
BrandSiemens
$342.66
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. 136-7860
Mfr. Part No.SM1X16400
BrandLovato
$52.61
Each
units
- - - - Screw 400 V ac - 18mm 80mm 90mm 18 x 80 x 90 mm SM1 Motor Protection Circuit Breakers SM1X
RS Stock No. 706-1778
Mfr. Part No.3RV2011-1AA20
BrandSiemens
$107.51
Each
units
1.1 → 1.6 A 3P Sirius Innovation 100 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 711-6468
Mfr. Part No.MS132-4.0
BrandABB
$148.75
Each
units
2.5 4 A 3P - 100 kA Screw 690 V ac - - - - 45 x 90 x 87.75 mm - MS132
RS Stock No. 124-3116
Mfr. Part No.3RV2321-1HC10
BrandSiemens
$121.00
Each
units
Maximum of 8 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. 486-3518
Mfr. Part No.1SAM250000R1012
BrandABB
$222.26
Each
units
8 12 A 3P - 25 kA Screw 690 V ac - - - - 45 x 90 x 85.6 mm - ISAM
RS Stock No. 136-7847
Mfr. Part No.SM1X1111
BrandLovato
$15.06
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. 243-7139
Mfr. Part No.3RV1011-1EA10
BrandSiemens
$133.64
Each
units
2.8 → 4 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 492-1579
Mfr. Part No.PKZM01-12
BrandEaton
$136.72
Each
units
10 → 12 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01
RS Stock No. 395-0295
Mfr. Part No.GV2ME05
$332.73
Each
units
0.63 → 1 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 706-1835
Mfr. Part No.3RV2011-1KA20
BrandSiemens
$137.22
Each
units
9 → 12 A 3P Sirius Innovation 6 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
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