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. 818-176
Mfr. Part No.PKZM0-4
BrandEaton
TWD2,931.00
Each
units
2.5 → 4 A 3P - 60 kA - 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 395-0251
Mfr. Part No.GV2ME08
TWD1,819.00
Each
units
2.5 → 4 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. 395-0245
Mfr. Part No.GV2ME10
TWD5,855.00
Each
units
4 → 6.3 A 3P TeSys 3 kA Screw 690 V Manual 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm Motor Protection GV2M
RS Stock No. 706-1841
Mfr. Part No.3RV2021-4AA10
BrandSiemens
TWD2,667.00
Each
units
11 → 16 A 3P Sirius Innovation 4 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 818-182
Mfr. Part No.PKZM0-6,3
BrandEaton
TWD2,931.00
Each
units
4 → 6.3 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 818-148
Mfr. Part No.PKZM0-1
BrandEaton
TWD2,356.00
Each
units
0.63 → 1 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 395-0289
Mfr. Part No.GV2ME06
TWD2,023.00
Each
units
1 → 1.6 A 3P TeSys 100 kA Screw 690 V Manual 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm Motor Protection GV2M
RS Stock No. 212-7955
Mfr. Part No.PKZM0-16
BrandEaton
TWD2,917.00
Each
units
10 → 16 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 706-1822
Mfr. Part No.3RV2011-1HA10
BrandSiemens
TWD2,196.00
Each
units
5.5 → 8 A 3P Sirius Innovation 6 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 246-5027
Mfr. Part No.3RV1041-4KA10
BrandSiemens
TWD8,759.00
Each
units
57 → 75 A 3P Sirius Innovation 50 kA Screw 690 V - 165mm 70mm 174mm 165 x 70 x 174 mm - 3RV1
RS Stock No. 246-5011
Mfr. Part No.3RV1041-4JA10
BrandSiemens
TWD6,551.00
Each
units
45 → 63 A 3P Sirius Innovation 50 kA Screw 690 V - 165mm 70mm 174mm 165 x 70 x 174 mm - 3RV1
RS Stock No. 395-0267
Mfr. Part No.GV2ME07
TWD1,865.00
Each
units
1.6 → 2.5 A 3P TeSys 3 kA Screw 690 V Manual 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm Motor Protection GV2M
RS Stock No. 395-0318
Mfr. Part No.GV2ME03
TWD1,574.00
Each
units
0.25 → 0.4 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 706-1866
Mfr. Part No.3RV2021-4CA10
BrandSiemens
TWD2,843.00
Each
units
17 → 22 A 3P Sirius Innovation 4 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 395-0217
Mfr. Part No.GV2ME20
TWD2,083.00
Each
units
13 → 18 A 3P TeSys 3 kA Screw 690 V Manual 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm Motor Protection GV2M
RS Stock No. 818-132
Mfr. Part No.PKZM0-0,63
BrandEaton
TWD2,607.00
Each
units
0.4 → 0.63 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 312-5269
Mfr. Part No.PKZM0-2,5-T
BrandEaton
TWD3,039.00
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. 395-0239
Mfr. Part No.GV2ME14
TWD2,083.00
Each
units
6 → 10 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. 122-1349
Mfr. Part No.MPW40-3-U020
BrandWEG
TWD2,285.00
Each
units
16 → 20 A 3 - 50 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors MPW40
RS Stock No. 243-7139
Mfr. Part No.3RV1011-1EA10
BrandSiemens
TWD2,500.00
Each
units
2.8 → 4 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1