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. 331-3624
BrandRS PRO
R 622.73
Each
units
1.6 → 2.4 A - - - Screw 690 V - 80mm 45mm 73.5mm 80 x 45 x 73.5 mm MS25 Series XL2000
RS stock no. 395-0324
Mfr. Part No.GV2ME02
R 1,264.69
Each
units
0.16 → 0.25 A 3P TeSys - Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS stock no. 706-1831
Mfr. Part No.3RV2011-1KA10
BrandSiemens
R 1,281.10
Each
units
9 → 12 A 3P Sirius Innovation 6 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS stock no. 212-7961
Mfr. Part No.PKZM0-25
BrandEaton
R 2,109.03
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. 706-1844
Mfr. Part No.3RV2011-4AA10
BrandSiemens
R 1,331.29
Each
units
11 → 16 A 3P Sirius Innovation 4 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS stock no. 608-8343
Mfr. Part No.GV2L20
R 1,811.51
Each
units
12 → 18 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS stock no. 445-0392
Mfr. Part No.MS116-10
BrandABB
R 1,345.26
Each
units
- 3P - - - 690 V ac - - - - - - MS116
RS stock no. 413-1619
Mfr. Part No.GV2ME143
R 1,913.20
Each
units
6 → 10 A 3P TeSys 10 kA Cage Clamp 500 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS stock no. 608-8270
Mfr. Part No.GV2L05
R 1,422.21
Each
units
1 → 1.7 A 3P TeSys 100 kA Screw 690 V ac Turn 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS stock no. 608-8567
Mfr. Part No.GV2RT08
R 1,880.86
Each
units
2.5 → 4 A 3P TeSys - - 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2R
RS stock no. 755-2943
Mfr. Part No.3RV2811-1FD10
BrandSiemens
R 1,570.00
Each
units
5 A 3P Sirius Innovation 65 kA Screw 690 V - 144mm 45mm 91mm 144 x 45 x 91 mm - -
RS stock no. 122-1337
Mfr. Part No.MPW40-3-U040
BrandWEG
R 2,349.00
Each
units
32 → 40 A 3 - 30 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors MPW40
RS stock no. 899-5234
Mfr. Part No.DC2CU10L
BrandAltech
R 942.99
Each
units
Maximum of 10 A 2 - 10 kA Screw 250 V dc Manual 35mm 109mm 66.5mm 35 x 109 x 66.5 mm - L
RS stock no. 121-6855
BrandRS PRO
R 597.13
Each
units
13 → 18 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. 121-6856
BrandRS PRO
R 668.00
Each
units
17 → 23 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. 123-6688
Mfr. Part No.9000-41034-0100400
R 2,304.54
Each
units
1 → 4 A 4 MICO Intelligent - Cage Clamp 24 V dc - 70mm 80mm 90mm 70 x 80 x 90 mm - -
RS stock no. 818-160
Mfr. Part No.PKZM0-2,5
BrandEaton
R 1,440.60
Each
units
1.6 → 2.5 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS stock no. 755-2911
Mfr. Part No.3RV2311-1CC10
BrandSiemens
R 698.00
Each
units
2.5 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS stock no. 608-8416
Mfr. Part No.GV2LE14
R 1,263.32
Each
units
10 A 3P TeSys 3 kA Screw 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2L
RS stock no. 711-6464
Mfr. Part No.MS132-2.5
BrandABB
R 1,423.40
Each
units
- 3P - - - 690 V ac - - - - - - MS132