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. 124-3107
144,00 €
Aantal stuks
18 → 25 A 3 Sirius Innovation 100 kA @ 400 V ac Screw 690 V ac Manual 55mm 149.4mm 140mm 55 x 140 x 149.4 mm Three Phase Motors SRV2
RS-stocknr. 196-3567
22,36 €
Aantal stuks
3 → 8.4 A 3 - - Blade Terminal 24 V - 36mm 60mm 63mm 36 x 60 x 63 mm - -
RS-stocknr. 312-5253
63,70 €
Aantal stuks
1 → 1.6 A 3P - 150 kA Screw 690 V ac - 93mm 45mm 76mm 93 x 45 x 76 mm - PKZM 0
RS-stocknr. 899-5240
47,29 €
Aantal stuks
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-stocknr. 187-728
69,31 €
Aantal stuks
0.4 → 0.63 A 3P TeSys - - 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2R
RS-stocknr. 122-0723
58,63 €
Aantal stuks
0.63 → 1 A 3 - 100 kA/415V Screw 690 V Manual 97mm 45mm 98mm 44.8 x 97.5 x 97.2 mm Transformers MPW40t
RS-stocknr. 122-1375
73,35 €
Aantal stuks
10 → 16 A 3 - 50 kA/415V Screw 690 V Manual 97mm 45mm 98mm 45 x 98 x 97.2 mm Motors MPW40t
RS-stocknr. 706-1743
55,80 €
Aantal stuks
0.35 → 0.5 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
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