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庫存編號 764-9087
製造零件編號MS116-32
BrandABB
HK$1,238.84
單位
25 → 32 A 3 MS Range 10 kA Screw 690 V ac - 97.8mm 45mm 86.6mm 97.8 x 45 x 86.6 mm - MS116
RS庫存編號 608-8337
製造零件編號GV2L16
HK$873.57
單位
9 → 13 A, 12 → 18 A 3P TeSys 4 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2L
RS庫存編號 136-7837
製造零件編號SM1R0250
BrandLovato
HK$457.36
單位
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庫存編號 124-3120
製造零件編號3RV2321-4BC10
BrandSiemens
HK$662.76
單位
Maximum of 20 A 3 Sirius Innovation 55 kA @ 400 V ac Screw 690 V ac Manual 45mm 96.9mm 97mm 45 x 97 x 96.9 mm Three Phase Motors SRV2
RS庫存編號 136-7833
製造零件編號SM1R0040
BrandLovato
HK$384.83
單位
0.25 → 0.4 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庫存編號 121-6854
BrandRS PRO
HK$265.20
單位
9 → 14 A 3 - 25 kA @ 230 V Screw 690 V Automatic 45mm 89.5mm 78.5mm 45 x 89.5 x 78.5 mm Motor Protection Switches MS32