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. 136-7849
Mfr. Part No.SM1X1202
BrandLovato
$12.98
Each
units
10 A 2 - - Screw 690 V - 9mm 80mm 90mm 9 x 80 x 90 mm SM1 Motor Protection Circuit Breakers SM1X
RS Stock No. 875-1122
Mfr. Part No.3RV2031-4VA10
BrandSiemens
$359.28
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. 136-7873
Mfr. Part No.SM1Z1710R
BrandLovato
$61.65
Each
units
- - - - - - - 100mm 137.8mm 159mm 100 x 137.8x 159 mm SM1P Motor Protection Circuit Breakers, SM1R Black Handle SM1Z
RS Stock No. 136-9689
Mfr. Part No.3RV2031-4RA10
BrandSiemens
$444.00
Each
units
70 → 80 A 3 Sirius Innovation 65 kA Screw 690 V - 55mm 140mm 149.3mm 55 x 140 x 149.3 mm Motor Protection 3RV2
New
RS Stock No. 196-3577
Mfr. Part No.3VA24635HL320AA0
BrandSiemens
$6,060.06
Each
units
250 → 630 A 3 Sentron 85 @ 240 V kA Front, Lug 690 V ac - 138mm 137mm 248mm 138 x 110 x 248 mm Line Protection 3VA2
RS Stock No. 124-3120
Mfr. Part No.3RV2321-4BC10
BrandSiemens
$123.48
Each
units
Maximum of 20 A 3 Sirius Innovation 55 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. 243-7016
Mfr. Part No.3RV1011-0DA10
BrandSiemens
$98.23
Each
units
0.22 → 0.32 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 706-1850
Mfr. Part No.3RV2021-4AA20
BrandSiemens
$128.51
Each
units
11 → 16 A 3P Sirius Innovation 4 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS Stock No. 866-1316
Mfr. Part No.PKZM0-10/AK
BrandEaton
$139.97
Each
units
6.3 → 10 A 3P - 60 kA Screw 690 V ac Manual 45mm 93mm 94mm 45 x 93 x 94 mm - PKZM 0
RS Stock No. 124-3119
Mfr. Part No.3RV2321-4AC10
BrandSiemens
$123.48
Each
units
Maximum of 16 A 3 Sirius Innovation 55 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. 136-7848
Mfr. Part No.SM1X1120
BrandLovato
$13.04
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. 136-7847
Mfr. Part No.SM1X1111
BrandLovato
$13.57
Each
units
5 A 2 - - Screw 300 V - 9mm 80mm 90mm 9 x 80 x 90 mm SM1 Motor Protection Circuit Breakers SM1X
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