Thermal Magnetic Circuit Breakers

Thermal magnetic circuit breakers are devices that provide protection against overcurrent in circuits. Circuit breakers use an automatically operated electrical switch to disrupt the flow of current when an overload or short circuit is detected. Thermal magnetic circuit breakers do this using an electromagnet and bimetallic strips. 


Circuit breakers provide more sophisticated protection against overcurrent than a simple fuse. Fuses simply burn out and have to be replaced, whereas circuit breakers just need to be reset.


How do thermal magnetic circuit breakers work?

In thermal magnetic circuit breakers, there are two ways the flow of current might be detected and disrupted. In the event of a short circuit, the electromagnet rapidly trips the switch. If the overload is smaller, over a longer period of time, the bimetallic strips will instead eventually react to trip the switch. 


What are thermal magnetic circuit breakers used for?

Thermal magnetic circuit breakers are most often used in distribution boards. They make up part of the subsidiary circuits in the broader electrical supply system, protecting against overcurrent.


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Description Price Current Rating Number of Poles Range Voltage Rating Width Series Application Break Time Breaking Capacity at Maximum Voltage Rating Circuit Breaker Type Mounting Hole Diameter Mounting Hole Length Mounting Hole Size Mounting Hole Width
RS庫存編號 881-1328
製造零件編號EA3-B0-24-810-22A-DC
HK$749.30
單位
100A 3 - - - E Generators, Ideal for Higher Current and Voltage Applications, Industrial Appliances, Military, Renewable Energy Systems Medium 5000 A @ 125 V dc, 5000 A @ 240 Vac MCCB - 79.7mm 79.7 x 69.85mm 69.9mm
RS庫存編號 881-0947
製造零件編號CA2-B0-34-630-121-D
HK$424.42
單位
30A 2 - - - C General Purpose Medium 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - 38.6mm 38.61 x 52.37mm 52.4mm
RS庫存編號 881-0953
製造零件編號CA2-B0-34-650-121-C
HK$424.42
單位
50A 2 - - - C General Purpose Medium 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - 38.6mm 38.61 x 52.37mm 52.4mm
RS庫存編號 881-1053
製造零件編號CB3-B0-34-615-121-D
HK$669.45
單位
15A 3 - - - C General Purpose Medium 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - 57.9mm 57.91 x 52.37mm 52.4mm
RS庫存編號 881-1057
製造零件編號CB4-B0-22-615-22C-E
HK$951.15
單位
15A 4 - - - C General Purpose Short 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - 77.2mm 77.22 x 52.37mm 52.4mm
RS庫存編號 881-4728
製造零件編號AC1-A0-03-630-131-C
HK$130.02
單位
30A 1 - - - A Generators, Marine Applications, Military, Renewable Energy Systems, Telecommunications, Welder - 5000 A @ 80 V dc - - 19.1mm 19.05 x 42.16mm 42.2mm
RS庫存編號 881-0987
製造零件編號CA2-P0-D4-820-321-MT
HK$1,393.785
/個 (每包:2個)
單位
200A 2 - - - C General Purpose Medium 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - 38.6mm 38.61 x 52.37mm 52.4mm
RS庫存編號 881-0931
製造零件編號CA2-B0-34-620-121-C
HK$424.42
單位
20A 2 - - - C General Purpose Medium 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - 38.6mm 38.61 x 52.37mm 52.4mm
RS庫存編號 881-0997
製造零件編號CA3-B0-22-650-12A-D
HK$724.30
單位
50A 3 - - - C General Purpose Short 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - 57.9mm 57.91 x 52.37mm 52.4mm
RS庫存編號 881-0877
製造零件編號CA1-B0-36-680-321-L
HK$253.60
單位
80A 1 - - - C General Purpose Long 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - 19.3mm 19.3 x 52.37mm 52.4mm
RS庫存編號 881-0990
製造零件編號CA3-B0-21-650-12A-C
HK$724.30
單位
50A 3 - - - C General Purpose Ultra Short 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - 57.9mm 57.91 x 52.37mm 52.4mm
RS庫存編號 881-0956
製造零件編號CA2-B0-34-630-221-C
HK$950.635
/個 (每包:2個)
單位
30A 2 - - - C General Purpose Medium 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - 38.6mm 38.61 x 52.37mm 52.4mm
RS庫存編號 881-1072
製造零件編號CF2-B0-26-470-21A-DJ
HK$1,068.27
/個 (每包:2個)
單位
7A 2 - - - C General Purpose Long 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - - - -
RS庫存編號 881-1000
製造零件編號CA3-B0-22-650-221-E
HK$1,499.59
/個 (每包:2個)
單位
50A 3 - - - C General Purpose Short 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - 57.9mm 57.91 x 52.37mm 52.4mm
RS庫存編號 881-5002
製造零件編號MB2-B-34-615-1-A27-B-C
HK$253.76
單位
15A 2 - - - M Automotive, Communication Equipment, Generators, Marine Applications, Medical Equipment, Power Supplies Medium 600 A @ 80 V dc MCB - 33.8mm 33.76 x 37.08mm 37.1mm
RS庫存編號 881-5093
製造零件編號MU1-B-34-430-1-A21-B-D
HK$55.72
單位
3A 1 - - - M Automotive, Communication Equipment, Generators, Marine Applications, Medical Equipment, Power Supplies Medium 600 A @ 80 V dc MCB 9.5mm - 9.53 (Dia.)mm -
RS庫存編號 881-0971
製造零件編號CA2-B0-46-615-622-E
HK$805.90
/個 (每包:2個)
單位
15A 2 - - - C General Purpose Long 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - 38.6mm 38.61 x 52.37mm 52.4mm
RS庫存編號 881-1088
製造零件編號CLB-203-11A3N-B-A
HK$21.098
/個 (每包:10個)
單位
20A 1 - - - CLB Audio Visual Equipment, Household Appliances, Marine Applications, Medical Equipment, Power Strips, Power Supplies, Transportation Time Delayed 2500 A @ 32 V dc - - 10mm 10 x 11.2mm 11.2mm
RS庫存編號 881-5119
製造零件編號MU1-B-34-620-1-A21-B-C
HK$55.72
單位
20A 1 - - - M Automotive, Communication Equipment, Generators, Marine Applications, Medical Equipment, Power Supplies Medium 600 A @ 80 V dc MCB 9.5mm - 9.53 (Dia.)mm -
RS庫存編號 881-1237
製造零件編號DB2-B0-32-425-1A1-C
HK$1,065.015
/個 (每包:2個)
單位
2.5A 2 - - - D Automation Short - MCCB - 38.6mm 38.61 x 52.37mm 52.4mm