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 899-1522
製造零件編號2D4UM
BrandAltech
HK$265.34
單位
4A 2 - - - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformers, UL508 Application Time Delay 10 kA MCCB - - - -
RS庫存編號 173-9844
製造零件編號4411.013
BrandSchurter
HK$143.422
個 (以毎盒:20)
單位
2A 1 - 240V ac - T13 - - - - - - - -
RS庫存編號 899-4798
製造零件編號3CU32L
BrandAltech
HK$530.67
單位
32A 3 - - - L Lighting and Control Circuit Applications, Low Inrush Motors, Receptacles, Resistive Load, UL489 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS庫存編號 898-2341
製造零件編號1B10UM
BrandAltech
HK$144.03
單位
10A 1 - 42 V dc, 277 V ac - V-EA Control Circuit, Industrial, Lighting, Motors, Solenoids, Transformers, Wiring Time Delayed 10 kA MCB - - - -
RS庫存編號 899-4846
製造零件編號3CU60L
BrandAltech
HK$712.45
單位
60A 3 - 240V ac - L Lighting and Control Circuit Applications, Low Inrush Motors, Receptacles, Resistive Load, UL489 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS庫存編號 899-3161
製造零件編號2C5UL
BrandAltech
HK$443.80
單位
5A 2 - 480Y/277V - UL Lighting and Control Circuit Applications, Low Inrush Motors, Receptacles, Resistive Load, UL489 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS庫存編號 729-2754
製造零件編號2-5700-IG2-P10-DD-000040-6A
BrandETA
HK$213.24
單位
6A 1 - - - 2 5700 - - - - - - - -
RS庫存編號 898-1884
製造零件編號1G1UM
BrandAltech
HK$146.78
單位
1A 1 - 42V dc - V-EA - Time Delay 10 kA MCCB - - - -
RS庫存編號 881-4983
製造零件編號MA2-B-34-620-1-A14-B-E
HK$334.715
/個 (每包:6個)
單位
20A 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 899-4981
製造零件編號3D32UM
BrandAltech
HK$398.08
單位
32A 3 - 480Y/277V - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformers, UL508 Application Time Delay 10 kA MCCB - - - -
RS庫存編號 881-4725
製造零件編號AC1-B0-34-610-1G1-C
HK$172.77
單位
10A 1 - - - A Generators, Marine Applications, Military, Renewable Energy Systems, Telecommunications, Welder Medium 5000 A @ 80 V dc - - 19.1mm 19.05 x 42.16mm 42.2mm
RS庫存編號 881-4891
製造零件編號BA2-B0-34-620-121-D
HK$355.89
單位
20A 2 - - - B Control Panels, Generator and Welder Markets, Marine Applications, Medical Equipment, Military, Office Equipment, Power Supplies Medium 5000 A @ 120/240 V ac, 5000 A @ 80 V dc MCCB 16mm - - -
RS庫存編號 898-2525
製造零件編號1BU6R
BrandAltech
HK$95.98
單位
6A 1 - 48 V dc, 277 V ac - R Appliances, Business Equipment, Control Circuit, Lighting, Power Supplies, Sensitive Electronics, Wiring Protection Time Delayed 10 kA MCB - - - -
RS庫存編號 729-2805
製造零件編號3130-F130-P7T1-W02Q-1A
BrandETA
HK$403.49
單位
1A 3 - - - 3130 - - - - - - - -
RS庫存編號 898-4830
製造零件編號1CU25L
BrandAltech
HK$191.96
單位
- - - - - - - - - - - - - -
RS庫存編號 899-8706
製造零件編號3D4UM
BrandAltech
HK$606.09
單位
4A 3 - 480Y/277V - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformers, UL508 Application Time Delay 10 kA MCCB - - - -
RS庫存編號 898-2360
製造零件編號1B15UM
BrandAltech
HK$144.03
單位
15A 1 - 42 V dc, 277 V ac - V-EA Control Circuit, Industrial, Lighting, Motors, Solenoids, Transformers, Wiring Time Delayed 10 kA MCB - - - -
RS庫存編號 899-4681
製造零件編號3C63UL
BrandAltech
HK$619.18
單位
63A 3 - 240V ac - UL Lighting and Control Circuit Applications, Low Inrush Motors, Receptacles, Resistive Load, UL489 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS庫存編號 868-9131
製造零件編號4430.1353
BrandSchurter
HK$164.74
單位
5A - - 125/250V - - - - - MCB - - - -
RS庫存編號 899-4720
製造零件編號3CU10L
BrandAltech
HK$530.67
單位
10A 3 - - - L Lighting and Control Circuit Applications, Low Inrush Motors, Receptacles, Resistive Load, UL489 Application, Wiring Protection Time Delay 10 kA MCCB - - - -