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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Omschrijving Prijs Current Range Number of Poles Range Breaking Capacity Terminal Type Voltage Rating Reset Method Length Width Depth Dimensions For Use With Series
RS-stocknr. 900-2119
FabrikantnummerMA25UM
FabrikantAltech
€ 110,99
Each
Aantal stuks
- 3P - 20 kA - - - - - - - - MA
RS-stocknr. 136-7837
FabrikantnummerSM1R0250
FabrikantLovato
€ 47,23
Each
Aantal stuks
1.6 → 2.5 A 3 - 100 (Ics) kA, 100 (Icu) kA Screw 690 V Rotary Knob 44.8mm 91.1mm 96.6mm 44.8 x 91.1 x 96.6 mm High IE3 Efficiency Value Motors SM1R
RS-stocknr. 899-5246
FabrikantnummerDC2CU2L
FabrikantAltech
€ 47,29
Each
Aantal stuks
Maximum of 2 A 2 - 10 kA Screw 250 V dc Manual 35mm 109mm 66.5mm 35 x 109 x 66.5 mm - L
RS-stocknr. 754-6679
Fabrikantnummer3RV1011-1EA15
FabrikantSiemens
€ 95,00
Each
Aantal stuks
4 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 90mm 45mm 81mm 90 x 45 x 81 mm - -
RS-stocknr. 136-7840
FabrikantnummerSM1R1000
FabrikantLovato
€ 52,93
Each
Aantal stuks
6.3 → 10 A 3 - 100 (Ics) kA, 100 (Icu) kA Screw 690 V Rotary Knob 44.8mm 91.1mm 96.6mm 44.8 x 91.1 x 96.6 mm High IE3 Efficiency Value Motors SM1R
RS-stocknr. 608-8286
FabrikantnummerGV2L06
€ 72,91
Each
Aantal stuks
1 → 1.7 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS-stocknr. 899-5243
FabrikantnummerDC2CU15L
FabrikantAltech
€ 47,29
Each
Aantal stuks
Maximum of 15 A 2 - 10 kA Screw 250 V dc Manual 35mm 109mm 66.5mm 35 x 109 x 66.5 mm - L
RS-stocknr. 774-0146
FabrikantnummerPKE12/XTU-12
FabrikantEaton
€ 114,40
Each
Aantal stuks
3 → 12 A 3P - 100 kA Screw 690 V ac - 101mm 45mm 102.5mm 101 x 45 x 102.5 mm - PKE
RS-stocknr. 122-1341
FabrikantnummerMPW40-3-D004
FabrikantWEG
€ 48,08
Each
Aantal stuks
0.25 → 0.4 A 3 - 100 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors MPW40
RS-stocknr. 123-6692
Fabrikantnummer9000-41042-0100400
€ 89,66
Each
Aantal stuks
1 → 4 A 2 MICO Intelligent - Cage Clamp 24 V dc - 36mm 80mm 90mm 36 x 80 x 90 mm - -
RS-stocknr. 754-6676
Fabrikantnummer3RV1011-1DA15
FabrikantSiemens
€ 95,00
Each
Aantal stuks
3.2 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 90mm 45mm 81mm 90 x 45 x 81 mm - -
RS-stocknr. 774-0143
FabrikantnummerPKE12/XTU-1,2
FabrikantEaton
€ 114,40
Each
Aantal stuks
0.3 → 1.2 A 3P - 100 kA Screw 690 V ac - 101mm 45mm 102.5mm 101 x 45 x 102.5 mm - PKE
RS-stocknr. 122-1340
FabrikantnummerMPW40-3-C025
FabrikantWEG
€ 48,43
Each
Aantal stuks
0.16 → 0.25 A 3 - 100 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors MPW40
RS-stocknr. 122-1339
FabrikantnummerMPW40-3-C016
FabrikantWEG
€ 48,43
Each
Aantal stuks
0.1 → 0.16 A 3 - 100 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors MPW40
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