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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Nombre de résultats par page
Description Prix Current Range Number of Poles Range Breaking Capacity Terminal Type Voltage Rating Reset Method Length Width Depth Dimensions For Use With Series
N° de stock RS 351-5533
Référence fabricant140M-F8E-C45
240,00 €
Each
Unité
32 → 45 A - - 65 kA Screw 575 V - 110mm 54mm 109.5mm 110 x 54 x 109.5 mm - 140M
N° de stock RS 351-5331
Référence fabricant140M-C2E-B10
73,70 €
Each
Unité
0.63 → 1 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
N° de stock RS 351-5375
Référence fabricant140M-C2E-B63
78,50 €
Each
Unité
4 → 6.3 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
N° de stock RS 351-5347
Référence fabricant140M-C2E-B16
75,90 €
Each
Unité
1 → 1.6 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
N° de stock RS 351-5476
Référence fabricant140M-D8E-C10
107,00 €
Each
Unité
6.3 → 10 A - - 30 kA Screw 575 V - 90mm 72mm 84mm 90 x 72 x 84 mm - 140M
N° de stock RS 351-5482
Référence fabricant140M-D8E-C16
115,00 €
Each
Unité
10 → 16 A - - 30 kA Screw 575 V - 90mm 72mm 84mm 90 x 72 x 84 mm - 140M
N° de stock RS 351-5404
Référence fabricant140M-C2E-C16
88,90 €
Each
Unité
10 → 16 A 3P - 50 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
N° de stock RS 351-5296
Référence fabricant140M-C2E-A16
66,50 €
Each
Unité
0.1 → 0.16 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
N° de stock RS 351-5460
Référence fabricant140M-D8E-B63
101,00 €
Each
Unité
4 → 6.3 A 3P - 100 kA - 415 V - 90mm 45mm 84mm 90 x 45 x 84 mm - 140M
N° de stock RS 351-5397
Référence fabricant140M-C2E-C10
83,70 €
Each
Unité
6.3 → 10 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
N° de stock RS 351-5527
Référence fabricant140M-F8E-C32
215,00 €
Each
Unité
23 → 32 A - - 30 kA Screw 575 V - 110mm 54mm 109.5mm 110 x 54 x 109.5 mm - 140M
N° de stock RS 351-5498
Référence fabricant140M-D8E-C20
120,00 €
Each
Unité
14.5 → 20 A - - 65 kA Screw 575 V - 90mm 72mm 84mm 90 x 72 x 84 mm - 140M
N° de stock RS 351-5410
Référence fabricant140M-C2E-C20
95,40 €
Each
Unité
14.5 → 20 A 3P - 15 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
N° de stock RS 351-5319
Référence fabricant140M-C2E-A40
66,50 €
Each
Unité
0.25 → 0.4 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
N° de stock RS 351-5325
Référence fabricant140M-C2E-A63
71,70 €
Each
Unité
0.45 → 0.63 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
N° de stock RS 351-5303
Référence fabricant140M-C2E-A25
66,50 €
Each
Unité
0.16 → 0.25 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
N° de stock RS 351-5511
Référence fabricant140M-D8E-C25
129,00 €
Each
Unité
18 → 25 A - - 30 kA Screw 575 V - 90mm 72mm 84mm 90 x 72 x 84 mm - 140M
N° de stock RS 351-5369
Référence fabricant140M-C2E-B40
78,50 €
Each
Unité
2.5 → 4 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
N° de stock RS 351-5426
Référence fabricant140M-C2E-C25
101,00 €
Each
Unité
18 → 25 A 3P - 15 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M
N° de stock RS 351-5353
Référence fabricant140M-C2E-B25
78,50 €
Each
Unité
1.6 → 2.5 A 3P - 100 kA - 415 V - 90mm 45mm 74mm 90 x 45 x 74 mm - 140M