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. 331-3680
BrandRS PRO
$86.86
Each
units
20 → 25 A - - - Screw 690 V - 80mm 45mm 73.5mm 80 x 45 x 73.5 mm MS25 Series XL2000
RS Stock No. 121-6854
BrandRS PRO
$49.41
Each
units
9 → 14 A 3 - 25 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. 331-3551
BrandRS PRO
$54.83
Each
units
0.1 → 0.16 A - - - Screw 690 V - 80mm 45mm 73.5mm 80 x 45 x 73.5 mm MS25 Series XL2000
RS Stock No. 121-6857
BrandRS PRO
$66.68
Each
units
20 → 27 A 3 - 25 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. 331-3567
BrandRS PRO
$49.89
Each
units
0.16 → 0.24 A - - - Screw 690 V - 80mm 45mm 73.5mm 80 x 45 x 73.5 mm MS25 Series XL2000
RS Stock No. 121-6847
BrandRS PRO
$43.19
Each
units
0.4 → 0.63 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. 121-6845
BrandRS PRO
$43.19
Each
units
0.16 → 0.25 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. 312-5297
Mfr. Part No.PKZM0-6,3-T
BrandEaton
$151.09
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. 818-154
Mfr. Part No.PKZM0-1,6
BrandEaton
$139.58
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. 395-0251
Mfr. Part No.GV2ME08
$281.35
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. 212-7955
Mfr. Part No.PKZM0-16
BrandEaton
$198.39
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. 395-0239
Mfr. Part No.GV2ME14
$281.35
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. 395-0223
Mfr. Part No.GV2ME16
$349.79
Each
units
9 → 14 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. 818-744
Mfr. Part No.PKZM0-10
BrandEaton
$162.78
Each
units
6.3 → 10 A 3P - 60 kA Screw 690 V - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS Stock No. 395-0245
Mfr. Part No.GV2ME10
$265.82
Each
units
4 → 6.3 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. 395-0267
Mfr. Part No.GV2ME07
$319.77
Each
units
1.6 → 2.5 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. 246-5011
Mfr. Part No.3RV1041-4JA10
BrandSiemens
$513.62
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. 395-0217
Mfr. Part No.GV2ME20
$288.55
Each
units
13 → 18 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. 305-2199
Mfr. Part No.GV2P10
$275.16
Each
units
4 → 6.3 A 3P TeSys 6 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS Stock No. 445-0386
Mfr. Part No.MS116-6.3
BrandABB
$121.08
Each
units
4 6.30 A 3P - 50 kA Screw 690 V ac - - - - 45 x 90 x 85.6 mm - MS116
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