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$1,361.25
單位
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS庫存編號 416-950
製造零件編號1110-F112-P1M1-1A
BrandETA
HK$157.96
單位
1A 1 - - 19mm 1110 - - - - - - - -
RS庫存編號 409-902
製造零件編號1610-21-20A
BrandETA
HK$62.66
單位
20A 1 - 32V dc 20mm 1610 - - - - - - - -
RS庫存編號 272-909
製造零件編號GV3P25
HK$1,092.50
單位
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -
RS庫存編號 409-839
製造零件編號1410-F110-P1F1-W14QB4-5A
BrandETA
HK$115.72
單位
5A 1 - - 17mm 1410-F - - - - - - - -
RS庫存編號 405-9270
製造零件編號8340-F410-P1M1-A3H0-40A
BrandETA
HK$294.52
單位
40A 1 - 80V dc 50.8mm 8340 - - - - - - - -
RS庫存編號 333-243
製造零件編號201-2A
BrandETA
HK$282.98
單位
2A 1 - - 80mm 201 - - - - - - - -
RS庫存編號 272-814
製造零件編號GV3L25
HK$978.50
單位
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -
RS庫存編號 898-2616
製造零件編號1C20UM
BrandAltech
HK$143.65
單位
20A 1 - 42 V dc, 277 V ac - V-EA Appliances, Business Equipment, Control Circuit, Lighting, Low Inrush Motors, Wiring Protection Time Delayed 10 kA MCB - - - -
RS庫存編號 868-9080
製造零件編號4430.0885
BrandSchurter
HK$228.78
單位
- - - - - - - - - - - - - -
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 344-5333
製造零件編號1658-G21-02-P10-16A
BrandETA
HK$46.29
單位
16A 1 - - 32mm 1658 - - - - - - - -
RS庫存編號 782-6565
製造零件編號W28-XT1A-15
HK$27.89
單位
15A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS庫存編號 868-9184
製造零件編號4430.2295
BrandSchurter
HK$204.00
/個 (每包:20個)
單位
5 A, 500 A 2 - 60 V dc, 240 V ac - TA45 - - - - - - - -
RS庫存編號 336-028
製造零件編號106-P30-000040-0.5A
BrandETA
HK$113.46
單位
500mA 1 - - 19mm 106-P30 - - - - - - - -
RS庫存編號 729-2798
製造零件編號3120-F554-P7T1-W19DG4-10A
BrandETA
HK$200.31
單位
10A 2 - - - 3120-F - - - - - - - -
RS庫存編號 272-858
製造零件編號GV3L65
HK$1,704.53
單位
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS庫存編號 212-2118
製造零件編號3130-F110-P7T1-W14QR7-2A
BrandETA
HK$176.50
單位
2A 1 - - 36mm 3130 - - - - - - - -
RS庫存編號 868-9131
製造零件編號4430.1353
BrandSchurter
HK$139.95
單位
5A - - 125/250V - - - - - MCB - - - -
RS庫存編號 899-1765
製造零件編號2E2.5UM
BrandAltech
HK$295.29
單位
2.5A 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 - - - -