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. 899-5259
Mfr. Part No.DC2CU5L
BrandAltech
TWD1,601.00
Each
units
Maximum of 5 A 2 - 10 kA Screw 250 V dc Manual 35mm 109mm 66.5mm 35 x 109 x 66.5 mm - L
RS Stock No. 900-2119
Mfr. Part No.MA25UM
BrandAltech
TWD3,836.00
Each
units
- 3P - 20 kA - - - - - - - - MA
RS Stock No. 900-2103
Mfr. Part No.MA2.5UM
BrandAltech
TWD3,179.00
Each
units
- 3P - 42 kA - - - - - - - - MA
RS Stock No. 899-5215
Mfr. Part No.DC1DU1L
BrandAltech
TWD817.00
Each
units
Maximum of 1 A 1 - 10 kA Screw 125 V dc Manual 17.5mm 109mm 66.5mm 17.5 x 109 x 66.5 mm - L
RS Stock No. 899-5228
Mfr. Part No.DC1DU4L
BrandAltech
TWD817.00
Each
units
- 1 - 10 kA - - - - - - - - L
RS Stock No. 900-2121
Mfr. Part No.MA4.0UM
BrandAltech
TWD3,180.00
Each
units
- 3P - 42 kA - - - - - - - - MA
RS Stock No. 900-2086
Mfr. Part No.MA1.0UM
BrandAltech
TWD3,179.00
Each
units
- 3P - 42 kA - - - - - - - - MA
RS Stock No. 900-3792
Mfr. Part No.P95UB
BrandAltech
TWD1,678.00
Each
units
- - - - - - - - - - - 3 Phase UL1077/508 Busbar P95
RS Stock No. 900-3783
Mfr. Part No.P35ULT
BrandAltech
TWD384.00
Each
units
- - - - - - - - - - - Miniature Molded Circuit Breakers -
RS Stock No. 899-5206
Mfr. Part No.DC1DU10L
BrandAltech
TWD817.00
Each
units
- 1 - 10 kA - - - - - - - - L
RS Stock No. 899-5209
Mfr. Part No.DC1CU6L
BrandAltech
TWD817.00
Each
units
- 1 - 10 kA - - - - - - - - L
RS Stock No. 899-5218
Mfr. Part No.DC1DU20L
BrandAltech
TWD817.00
Each
units
- 1 - 10 kA - - - - - - - - L
RS Stock No. 899-5183
Mfr. Part No.DC1CU2L
BrandAltech
TWD817.00
Each
units
- 1 - 10 kA - - - - - - - - L
RS Stock No. 900-2083
Mfr. Part No.MA0.63UM
BrandAltech
TWD2,968.00
Each
units
Maximum of 0.63 A 3 - 42 kA Cage Clamp 480Y/277 V ac Manual 52.5mm 89.5mm 74mm 52.5 x 89.5 x 74 mm Motors, Power Supplies, 3 Phase Transformers MA
RS Stock No. 899-5202
Mfr. Part No.DC1CU8L
BrandAltech
TWD817.00
Each
units
- 1 - 10 kA - - - - - - - - L
RS Stock No. 900-2109
Mfr. Part No.MA16UM
BrandAltech
TWD3,481.00
Each
units
- 3P - 14 kA - - - - - - - - MA
RS Stock No. 900-2125
Mfr. Part No.MA40UM
BrandAltech
TWD4,675.00
Each
units
- 3P - 20 kA - - - - - - - - MA
RS Stock No. 899-5240
Mfr. Part No.DC2CU30L
BrandAltech
TWD1,634.00
Each
units
Maximum of 30 A 2 - 10 kA Screw 250 V dc Manual 35mm 109mm 66.5mm 35 x 109 x 66.5 mm - L
RS Stock No. 900-2099
Mfr. Part No.MA10UM
BrandAltech
TWD3,179.00
Each
units
- 3P - 14 kA - - - - - - - - MA
RS Stock No. 900-3780
Mfr. Part No.P50ULB
BrandAltech
TWD335.00
Each
units
- - - - - - - - - - - Miniature Molded Circuit Breakers -