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. 136-9689
Mfr. Part No.3RV2031-4RA10
BrandSiemens
$488.40
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
RS Stock No. 243-7044
Mfr. Part No.3RV1011-0FA10
BrandSiemens
$110.63
Each
units
0.35 → 0.5 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 797-5576
Mfr. Part No.EMS-ROS-T-9-24VDC
BrandEaton
$333.67
Each
units
1.5 → 6.5 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. 124-3105
Mfr. Part No.3RV2021-1JA10
BrandSiemens
$134.11
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. 797-5554
Mfr. Part No.EMS-DO-T-9-24VDC
BrandEaton
$279.40
Each
units
1.5 → 6.5 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. 243-7117
Mfr. Part No.3RV1011-1CA10
BrandSiemens
$138.04
Each
units
1.8 → 2.5 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 608-8292
Mfr. Part No.GV2L07
$153.12
Each
units
1.6 → 2.5 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
New
RS Stock No. 196-3575
Mfr. Part No.3VA23405HL320AA0
BrandSiemens
$4,879.94
Each
units
160 → 400 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. 124-3122
Mfr. Part No.3RV2321-4DC10
BrandSiemens
$163.93
Each
units
Maximum of 25 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
New
RS Stock No. 196-3571
Mfr. Part No.3VA21635MQ360AA0
BrandSiemens
$3,763.62
Each
units
25 → 63 A 3 Sentron 85 @ 240 V kA Box, Front 690 V ac - 105mm 107mm 181mm 105 x 86 x 181 mm Motor Protection 3VA2
RS Stock No. 243-7050
Mfr. Part No.3RV1011-0GA10
BrandSiemens
$110.45
Each
units
0.45 → 0.63 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 492-1737
Mfr. Part No.PKZM01-0.16
BrandEaton
$111.18
Each
units
0.1 → 0.16 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01
RS Stock No. 395-0346
Mfr. Part No.GV2ME01
$280.28
Each
units
0.1 → 0.16 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 124-3102
Mfr. Part No.3RV2021-1EA10
BrandSiemens
$120.07
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. 124-3114
Mfr. Part No.3RV2321-1EC10
BrandSiemens
$121.48
Each
units
Maximum of 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. 136-7854
Mfr. Part No.SM1X14230
BrandLovato
$46.93
Each
units
- - - - Screw 230 V ac - 18mm 80mm 90mm 18 x 80 x 90 mm SM1 Motor Protection Circuit Breakers SM1X
RS Stock No. 312-5269
Mfr. Part No.PKZM0-2,5-T
BrandEaton
$167.50
Each
units
1.6 → 2.5 A 3P - 150 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 706-1718
Mfr. Part No.3RV2011-0BA10
BrandSiemens
$101.43
Each
units
0.14 → 0.2 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 395-0201
Mfr. Part No.GV2ME22
$354.19
Each
units
20 → 25 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
New
RS Stock No. 194-7640
Mfr. Part No.S8V-CP0424
BrandOmron
$303.67
Each
units
40 A - - - Push In 24 V dc - 44.8mm 94.8mm 95.1mm 44.8 x 94.8 x 95.1 mm - S8V-CP
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