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 899-4672
製造零件編號3C5UM
BrandAltech
HK$398.08
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, Appliances, Business Equipment, Control Circuit Applications, Lighting, Low Inrush Motors, UL508 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS庫存編號 312-3853
製造零件編號GB2DB16
HK$457.60
單位
10A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1.5 kA - - - - -
RS庫存編號 899-3326
製造零件編號2CU4L
BrandAltech
HK$430.15
單位
4A 2 - - - 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 868-9096
製造零件編號4430.0982
BrandSchurter
HK$204.00
/個 (每包:20個)
單位
16A 2 - 60 V dc, 240 V ac - TA45 - - - - - - - -
RS庫存編號 881-1369
製造零件編號FA1-B0-14-825-12A-BG
HK$1,184.29
單位
250A 1 - - - F Battery Disconnect Systems, Higher Amperage Applications, Ideal for Applications Under Extreme Temperatures, Military, Solar Power Systems Short 10000 A @ 277 V ac, 50000 A @ 125 V dc MCCB - 38.3mm 38.29 x 59.13mm 59.1mm
RS庫存編號 175-1521
製造零件編號GV4PE03N6
HK$3,425.30
單位
3.5A 3 TeSys 690V ac 116mm GV4PE - - 8 kA @ 660 → 690 V ac - - - - -
RS庫存編號 175-1566
製造零件編號GV4PEM07S
HK$5,365.36
單位
7A 3 TeSys 690V ac 116mm GV4PEM - - 10 kA @ 660 → 690 V ac - - - - -
RS庫存編號 881-0448
製造零件編號1658532
HK$202.46
單位
- - - - - VS-SI-FP-2F - - - - - - - -
RS庫存編號 712-7660
製造零件編號3120-F551-H7T1-W19DG4-16A
BrandETA
HK$268.38
單位
16A 2 - - 25mm 3120 - - - - - - - -
RS庫存編號 881-8244
製造零件編號1689006
HK$69.628
個 (以毎盒:10)
單位
- - - - - VS-09-ST-DSUB-1P-4S - - - - - - - -
RS庫存編號 729-2859
製造零件編號3600-P10-Si-15A
BrandETA
HK$569.48
單位
15A 1 - - 11.5mm 3600 - - - - - - - -
RS庫存編號 881-8146
製造零件編號1687273
HK$171.783
個 (以毎盒:10)
單位
- - - - - HC-B 16-SD-FQT/FS - - - - - - - -
RS庫存編號 899-4679
製造零件編號3C60UL
BrandAltech
HK$619.18
單位
60A 3 - 240V ac - UL Lighting and Control Circuit Applications, Low Inrush Motors, Receptacles, Resistive Load, UL489 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
全新
RS庫存編號 201-5734
製造零件編號2800882
HK$469.04
單位
3A 2 Trabtech 80V dc 24.6mm CB TM2 - - - - - - - -
RS庫存編號 782-8048
製造零件編號W51-A152A1-10
HK$36.61
單位
10A 1 - 250V ac 0.598in W51 - - - - - - - -
RS庫存編號 175-0386
製造零件編號3120-F521-P7T1-W01D-12A-A04011211M
BrandETA
HK$456.73
單位
12A 2 - 50 V dc, 240 V ac 25mm 3120 - - 1000 A @ 50 V dc, 5000 A @ 250 V ac - - 44.5mm 44.5 x 22mm 22mm
RS庫存編號 782-8079
製造零件編號W51-A122B1-5
HK$38.32
單位
5A 1 - 250V ac 0.598in W51 - - - - - - - -
RS庫存編號 881-8269
製造零件編號1689323
HK$43.472
個 (以毎盒:10)
單位
- - - - - VS-PSC 1.5/5-M PE - - - - - - - -
RS庫存編號 899-8889
製造零件編號3DU5R
BrandAltech
HK$403.83
單位
5A 3 - 480Y/277V - R Appliance Circuit, Control Transformers, Power Supplies, Power Supplies and Reactive Loads, Sensitive Electronics, UL1077 Application Time Delay 10 kA MCCB - - - -
RS庫存編號 312-3869
製造零件編號GB2DB20
HK$457.60
單位
12A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1.5 kA - - - - -