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. 755-2700
Mfr. Part No.3RV1041-4FA10
BrandSiemens
$436.45
Each
units
40 A 3P Sirius Innovation 50 kA Screw 690 V ac/dc - 165mm 70mm 174mm 165 x 70 x 174 mm - -
RS Stock No. 136-7833
Mfr. Part No.SM1R0040
BrandLovato
$73.32
Each
units
0.25 → 0.4 A 3 - 100 (Ics) kA, 100 (Icu) kA Screw 690 V Rotary Knob 44.8mm 91.1mm 96.6mm 44.8 x 91.1 x 96.6 mm High IE3 Efficiency Value Motors SM1R
RS Stock No. 124-3098
Mfr. Part No.3RV2011-1EA15
BrandSiemens
$127.16
Each
units
2.8 → 4 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. 136-7848
Mfr. Part No.SM1X1120
BrandLovato
$12.30
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. 619-4741
Mfr. Part No.PKZM4-58
BrandEaton
$311.15
Each
units
50 → 58 A 3P - 60 kA Screw 690 V ac - 140mm 55mm 160mm 140 x 55 x 160 mm - PKZM 4
RS Stock No. 744-6882
Mfr. Part No.GV2RT07
$290.13
Each
units
1.6 → 2.5 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2R
RS Stock No. 706-1721
Mfr. Part No.3RV2011-0CA10
BrandSiemens
$92.21
Each
units
0.18 → 0.25 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 136-7863
Mfr. Part No.SM1X18200R
BrandLovato
$62.42
Each
units
- - - - - - - 200 (Rod)mm - - - SM1R Motor Protection Circuit Breakers SM1X
RS Stock No. 875-1119
Mfr. Part No.3RV2031-4PA10
BrandSiemens
$262.60
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. 492-1507
Mfr. Part No.PKZM01-1
BrandEaton
$116.97
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. 136-7862
Mfr. Part No.SM1X18200
BrandLovato
$62.42
Each
units
- - - - - - - 200 (Rod)mm - - - SM1R Motor Protection Circuit Breakers SM1X
RS Stock No. 706-1825
Mfr. Part No.3RV2011-1HA20
BrandSiemens
$110.20
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. 492-1490
Mfr. Part No.PKZM01-063
BrandEaton
$101.59
Each
units
0.4 → 0.63 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01
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