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 272-937
製造零件編號GV3P65
HK$1,401.53
單位
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS庫存編號 855-7399
製造零件編號2800913
HK$462.06
單位
- - - - - - - - - - - - - -
RS庫存編號 729-2855
製造零件編號3600-P10-Si-10A
BrandETA
HK$616.73
單位
10A 1 - - 11.5mm 3600 - - - - - - - -
RS庫存編號 729-2833
製造零件編號3600-P10-Si-1A
BrandETA
HK$448.21
單位
1A 1 - - 11.5mm 3600 - - - - - - - -
RS庫存編號 273-4676
製造零件編號8340-F410-P1M1-A3H0-30A
BrandETA
HK$347.78
單位
30A 1 - 80V dc 19mm 8340 - - - - - - - -
RS庫存編號 405-9129
製造零件編號2-5700-IG1-P10-DD-000040-2.5A
BrandETA
HK$145.40
單位
2.5A 1 - - 15.7mm 2-5700 - - - - - - - -
RS庫存編號 416-950
製造零件編號1110-F112-P1M1-1A
BrandETA
HK$194.97
單位
1A 1 - - 19mm 1110 - - - - - - - -
RS庫存編號 409-839
製造零件編號1410-F110-P1F1-W14QB4-5A
BrandETA
HK$134.94
單位
5A 1 - - 17mm 1410-F - - - - - - - -
RS庫存編號 333-243
製造零件編號201-2A
BrandETA
HK$297.30
單位
2A 1 - - 80mm 201 - - - - - - - -
RS庫存編號 286-0719
製造零件編號3120-F551-H7T1-W02D-16A
BrandETA
HK$180.12
單位
16A 2 - - 25mm 3120 - - - - - - - -
RS庫存編號 729-2837
製造零件編號3600-P10-Si-2A
BrandETA
HK$575.66
單位
2A 1 - - 11.5mm 3600 - - - - - - - -
RS庫存編號 729-2798
製造零件編號3120-F554-P7T1-W19DG4-10A
BrandETA
HK$263.58
單位
10A 2 - - 25mm 3120-F - - - - - - - -
RS庫存編號 333-259
製造零件編號201-3A
BrandETA
HK$276.90
單位
3A 1 - - 80mm 201 - - - - - - - -
RS庫存編號 899-4843
製造零件編號3CU63L
BrandAltech
HK$574.92
單位
63A 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 344-5327
製造零件編號1658-G21-02-P10-6A
BrandETA
HK$46.29
單位
6A 1 - - 14mm 1658 - - - - - - - -
RS庫存編號 801-6983
製造零件編號0914099
HK$720.35
單位
2A 1 - 65 V dc, 250 V ac 12.5mm TMC 1 - - - - - - - -
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 782-6575
製造零件編號W33-S4B1Q-15
HK$178.86
單位
15A 2 - 120V ac 21.59mm W33 - - - - - - - -
RS庫存編號 801-7028
製造零件編號0914439
HK$684.03
單位
1A 1 - 65 V dc, 250 V ac 12.5mm TMC M1 - - - - - - - -
RS庫存編號 899-1752
製造零件編號2E12UM
BrandAltech
HK$295.29
單位
12A 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 - - - -