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.


...
Read more Read less

Filters

Viewing 61 - 80 of 431 products
Results per page
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. 243-7088
Mfr. Part No.3RV1011-0KA10
BrandSiemens
HK$605.52
Each
units
0.9 → 1.25 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS Stock No. 212-7961
Mfr. Part No.PKZM0-25
BrandEaton
HK$1,020.49
Each
units
20 → 25 A 3P - 40 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 312-5297
Mfr. Part No.PKZM0-6,3-T
BrandEaton
HK$743.60
Each
units
4 → 6.3 A 3P - 150 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 608-8309
Mfr. Part No.GV2L08
HK$1,940.21
Each
units
2.5 → 4 A, 4 → 6 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS Stock No. 211-4482
Mfr. Part No.PKZM0-20
BrandEaton
HK$949.20
Each
units
16 → 20 A 3P - 40 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 818-154
Mfr. Part No.PKZM0-1,6
BrandEaton
HK$716.94
Each
units
1 → 1.6 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 121-6848
BrandRS PRO
HK$231.81
Each
units
0.63 → 1 A 3 - 100 kA @ 230 V Screw 690 V Automatic 45mm 89.5mm 78.5mm 45 x 89.5 x 78.5 mm Motor Protection Switches MS32
RS Stock No. 754-6663
Mfr. Part No.3RV1011-0HA15
BrandSiemens
HK$722.78
Each
units
0.8 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 90mm 45mm 81mm 90 x 45 x 81 mm - -
RS Stock No. 123-6691
Mfr. Part No.9000-41034-0401005
HK$1,505.52
Each
units
4 A, 6 A, 8 A, 10 A 4 - - Cage Clamp 24 V dc - 70mm 80mm 90mm 70 x 80 x 90 mm - -
RS Stock No. 744-6891
Mfr. Part No.GV2RT21
HK$1,384.24
Each
units
17 → 23 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2R
RS Stock No. 754-6667
Mfr. Part No.3RV1011-1BA15
BrandSiemens
HK$785.47
Each
units
2 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 90mm 45mm 81mm 90 x 45 x 81 mm - -
RS Stock No. 123-6692
Mfr. Part No.9000-41042-0100400
HK$762.65
Each
units
1 → 4 A 2 MICO Intelligent - Cage Clamp 24 V dc - 36mm 80mm 90mm 36 x 80 x 90 mm - -
RS Stock No. 754-6673
Mfr. Part No.3RV1011-1GA15
BrandSiemens
HK$785.47
Each
units
6.3 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 90mm 45mm 81mm 90 x 45 x 81 mm - -
RS Stock No. 136-7862
Mfr. Part No.SM1X18200
BrandLovato
HK$328.30
Each
units
- - - - - - - 200 (Rod)mm - - - SM1R Motor Protection Circuit Breakers SM1X
RS Stock No. 123-6693
Mfr. Part No.9000-41042-0100600
HK$789.20
Each
units
1 A, 2 A, 4 A, 6 A 2 - - Cage Clamp 24 V dc - 36mm 80mm 90mm 36 x 80 x 90 mm - -
RS Stock No. 243-7145
Mfr. Part No.3RV1011-1FA10
BrandSiemens
HK$636.06
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. 706-1728
Mfr. Part No.3RV2011-0DA10
BrandSiemens
HK$470.07
Each
units
0.22 → 0.32 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
HK$354.37
Each
units
- - - - - - - 200 (Rod)mm - - - SM1R Motor Protection Circuit Breakers SM1X
RS Stock No. 866-1307
Mfr. Part No.XTPR6P3BC1
BrandEaton
HK$714.52
Each
units
4 → 6.3 A 3P - 25 A@ 250 V dc, 32 A@ 690 V ac Screw 690 V ac Manual 45mm 93mm 94mm 45 x 93 x 94 mm - -
RS Stock No. 764-9075
Mfr. Part No.MS116-20
BrandABB
HK$862.69
Each
units
16 → 20 A 3 MS Range 15 kA Screw 690 V ac - 97.8mm 45mm 86.6mm 97.8 x 45 x 86.6 mm - MS116
Related Products
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam ...
Description:
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam and pump linkage for long lifePumping handle included on all modelsSafety relief valve to prevent overloadAutomatic by-pass port to prevent over-extensionWiper seal for extended lifeThick base material with large area for increased ...
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam ...
Description:
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam and pump linkage for long lifePumping handle included on all modelsSafety relief valve to prevent overloadAutomatic by-pass port to prevent over-extensionWiper seal for extended lifeThick base material with large area for increased ...
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam ...
Description:
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam and pump linkage for long lifePumping handle included on all modelsSafety relief valve to prevent overloadAutomatic by-pass port to prevent over-extensionWiper seal for extended lifeThick base material with large area for increased ...
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam ...
Description:
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam and pump linkage for long lifePumping handle included on all modelsSafety relief valve to prevent overloadAutomatic by-pass port to prevent over-extensionWiper seal for extended lifeThick base material with large area for increased ...