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 711-6442
製造零件編號MS132-0.16
BrandABB
HK$643.84
單位
- 3P - - - 690 V ac - - - - - - MS132
RS庫存編號 146-9055
製造零件編號SM3R9900
BrandLovato
HK$2,585.59
單位
80 → 100 A 3 - 50 kA Screw 400 V Rotary Knob 70mm 169mm 165mm 70 x 169 x 165 mm Motor Protection SM3R
RS庫存編號 900-3792
製造零件編號P95UB
BrandAltech
HK$445.31
單位
- - - - - - - - - - - 3 Phase UL1077/508 Busbar P95
RS庫存編號 900-2125
製造零件編號MA40UM
BrandAltech
HK$1,186.53
單位
- 3P - 20 kA - - - - - - - - MA
RS庫存編號 492-1737
製造零件編號PKZM01-0.16
BrandEaton
HK$493.29
單位
0.1 → 0.16 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01
RS庫存編號 392-8119
製造零件編號3RV1011-0DA20
BrandSiemens
HK$536.08
單位
0.28 → 0.4 A 3P Sirius Innovation 100 kA Cage Clamp 690 V - 90mm 45mm 81mm 90 x 45 x 81 mm - 3RV1
RS庫存編號 121-6852
BrandRS PRO
HK$230.72
單位
4 → 6.3 A 3 - 100 kA @ 230 V Screw 690 V Automatic 45mm 89.5mm 78.5mm 45 x 89.5 x 78.5 mm Motor Protection Switches MS32
RS庫存編號 755-2794
製造零件編號3RV1331-4DC10
BrandSiemens
HK$1,569.57
單位
25 A 3P Sirius Innovation 50 kA Screw 690 V ac/dc - 140mm 55mm 149mm 140 x 55 x 149 mm - -
RS庫存編號 608-8393
製造零件編號GV2LE08
HK$606.32
單位
4 A 3P TeSys 3 kA Screw 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2L
RS庫存編號 875-1113
製造零件編號3RV2031-4UA10
BrandSiemens
HK$1,739.91
單位
32 → 40 A 3 Sirius Innovation 4 kA Screw 690 V - 140mm 55mm 149mm 140 x 55 x 149 mm Motor Protection 3RV2
RS庫存編號 755-2930
製造零件編號3RV2311-1HC10
BrandSiemens
HK$567.88
單位
8 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS庫存編號 136-7872
製造零件編號SM1X9050
BrandLovato
HK$213.40
單位
63 A - - - Screw - - - - - - All Busbar, SM1R Motor Protection Circuit Breakers SM1X
RS庫存編號 136-7831
製造零件編號SM1R0016
BrandLovato
HK$370.77
單位
0.1 → 0.16 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 755-2713
製造零件編號3RV1042-4JA10
BrandSiemens
HK$3,851.85
單位
63 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 165mm 70mm 174mm 165 x 70 x 174 mm - -
RS庫存編號 124-3108
製造零件編號3RV2031-4EA10
BrandSiemens
HK$1,490.17
單位
22 → 32 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庫存編號 331-3567
BrandRS PRO
HK$277.19
單位
0.16 → 0.24 A - - - Screw 690 V - 80mm 45mm 73.5mm 80 x 45 x 73.5 mm MS25 Series XL2000
RS庫存編號 900-2128
製造零件編號MA32UM
BrandAltech
HK$1,066.75
單位
- 3P - 20 kA - - - - - - - - MA
RS庫存編號 305-2161
製造零件編號GV2P06
HK$760.00
單位
1 → 1.6 A 3P TeSys 100 kA Screw 690 V - 89mm 44.5mm 97mm 89 x 44.5 x 97 mm - GV2P
RS庫存編號 136-7839
製造零件編號SM1R0650
BrandLovato
HK$455.20
單位
4 → 6.5 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 136-7841
製造零件編號SM1R1400
BrandLovato
HK$530.47
單位
9 → 14 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