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. 608-8551
Mfr. Part No.GV2RT06
R 1,659.60
Each
units
1 → 1.6 A 3P TeSys - - 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2R
RS stock no. 608-8567
Mfr. Part No.GV2RT08
R 1,689.89
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. 608-8517
Mfr. Part No.GV2P04
R 752.93
Each
units
0.4 → 0.63 A 3P TeSys 100 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS stock no. 331-3630
BrandRS PRO
R 539.85
Each
units
2.4 → 4 A - - - Screw 690 V - 80mm 45mm 73.5mm 80 x 45 x 73.5 mm MS25 Series XL2000
RS stock no. 212-7961
Mfr. Part No.PKZM0-25
BrandEaton
R 2,230.93
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. 608-8365
Mfr. Part No.GV2L32
R 2,199.88
Each
units
23 → 32 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS stock no. 331-3680
BrandRS PRO
R 808.77
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. 619-4729
Mfr. Part No.PKZM4-40
BrandEaton
R 3,346.68
Each
units
32 → 40 A 3P - 60 kA Screw 690 V ac - 140mm 55mm 160mm 140 x 55 x 160 mm - PKZM 4
RS stock no. 305-2212
Mfr. Part No.GV2P16
R 976.77
Each
units
9 → 14 A 3P TeSys 6 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS stock no. 121-6844
BrandRS PRO
R 420.02
Each
units
0.1 → 0.16 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. 706-1844
Mfr. Part No.3RV2011-4AA10
BrandSiemens
R 1,160.01
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. 243-7139
Mfr. Part No.3RV1011-1EA10
BrandSiemens
R 1,144.74
Each
units
2.8 → 4 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS stock no. 243-7094
Mfr. Part No.3RV1011-1AA10
BrandSiemens
R 1,045.05
Each
units
1.1 → 1.6 A 3P Sirius Innovation 100 kA Screw 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS stock no. 755-2930
Mfr. Part No.3RV2311-1HC10
BrandSiemens
R 698.00
Each
units
8 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS stock no. 608-8343
Mfr. Part No.GV2L20
R 1,691.09
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. 492-1529
Mfr. Part No.PKZM01-2,5
BrandEaton
R 1,073.15
Each
units
1.6 → 2.5 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01
RS stock no. 331-3624
BrandRS PRO
R 539.72
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. 305-2206
Mfr. Part No.GV2P14
R 976.77
Each
units
6 → 10 A 3P TeSys 6 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS stock no. 413-1619
Mfr. Part No.GV2ME143
R 1,718.95
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. 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 - -