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 173-8079
製造零件編號4404.0103
BrandSchurter
HK$21.512
個 (以毎盒:100)
單位
12A 1 - 48 V dc, 240 V ac 19mm T9 - - - - - - - -
RS庫存編號 881-8262
製造零件編號1689336
HK$31.757
個 (以毎盒:10)
單位
- - - - - VS-PSC 1.5/3-M PE - - - - - - - -
RS庫存編號 899-8725
製造零件編號3D5UL
BrandAltech
HK$875.16
單位
5A 3 - 480Y/277V - UL Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformers Time Delay 10 kA MCCB - - - -
RS庫存編號 899-4776
製造零件編號3CU25L
BrandAltech
HK$530.67
單位
25A 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 868-8891
製造零件編號4410.0202
BrandSchurter
HK$467.77
/個 (每包:20個)
單位
3A 1 - 48 V dc, 240 V ac - - - - - - - - - -
RS庫存編號 899-1777
製造零件編號2E25UM
BrandAltech
HK$295.29
單位
25A 2 - - - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, High Efficiency Motors, UL508 Application, Which have Exceedingly High Inrush Current Time Delay 10 kA MCCB - - - -
RS庫存編號 782-7969
製造零件編號W54-XB1A4A10-10
HK$34.63
單位
10A 1 - 250V ac 0.575in W54 - - - - - - - -
RS庫存編號 899-8728
製造零件編號3D5UM
BrandAltech
HK$606.09
單位
5A 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 768-0880
製造零件編號2800848
HK$313.68
單位
2A 1 TRABTECH - 12.3mm CB TM1 2A M1 P - - - - - - - -
RS庫存編號 869-2758
製造零件編號4435.0393
BrandSchurter
HK$175.26
單位
- 1, 2, 3 - - - TA35 - - - - - - - -
RS庫存編號 881-0820
製造零件編號CA1-B0-34-610-121-C
HK$174.31
單位
10A 1 - - - C General Purpose Medium 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 899-3098
製造零件編號2C2UL
BrandAltech
HK$583.44
單位
2A 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 868-8897
製造零件編號4410.0109
BrandSchurter
HK$479.88
/個 (每包:20個)
單位
3A 1 - - - TM12 - - - - - - - -
RS庫存編號 899-4760
製造零件編號3CU1R
BrandAltech
HK$265.34
單位
1A 3 - 480Y/277V - R Appliance Circuit, Appliances, Business Equipment, Control Circuit Application, Lighting, Power Supplies, Sensitive Electronics, UL1077 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS庫存編號 879-8648
製造零件編號AA1-B0-34-620-3B1-C
HK$149.15
單位
20A 1 - - - A Generators, Marine Applications, Military, Renewable Energy Systems, Telecommunications, Welder Medium 5000 A @ 80 V dc - 16mm - - -
RS庫存編號 728-8658
製造零件編號1140-E211-P1M1-4A
BrandETA
HK$101.24
單位
4A 1 - - - 1140-E - - - - - - - -
RS庫存編號 212-2168
製造零件編號3130-F110-P7T1-W14QR7-12A
BrandETA
HK$170.24
單位
12A 1 - 50 V dc, 250 V ac 36mm 3130 - - - - - - - -
RS庫存編號 782-8000
製造零件編號W58-XC4C12A-2
HK$71.88
單位
2A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS庫存編號 868-9276
製造零件編號4430.2907
BrandSchurter
HK$231.21
/個 (每包:20個)
單位
17A 2 - 60 V dc, 240 V ac - TA45 - - - - - - - -
RS庫存編號 899-4969
製造零件編號3D2UM
BrandAltech
HK$398.08
單位
2A 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 - - - -