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 899-8832
製造零件編號3DU25L
BrandAltech
HK$590.58
單位
25A 3 - - - L Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformer, UL489 Applications Time Delay 10 kA MCCB - - - -
RS庫存編號 728-8639
製造零件編號105-P10-6A
BrandETA
HK$100.60
單位
6A 1 - - - 105 - - - - - - - -
RS庫存編號 868-9137
製造零件編號4430.1328
BrandSchurter
HK$182.75
單位
15A 2 - 60 V dc, 240 V ac - T45-2R Industrial Appliances, Power Supplies, Power Tools - 1 kA MCB - - - -
RS庫存編號 899-4638
製造零件編號3C3UL
BrandAltech
HK$574.92
單位
3A 3 - 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 728-8608
製造零件編號104-PR-1.8A
BrandETA
HK$92.50
單位
1.8A 1 - - - 104-PR - - - - - - - -
RS庫存編號 782-7883
製造零件編號W93-X112-25
HK$682.16
單位
25A 3 - 277V ac 2.25in W93 - - - - - - - -
RS庫存編號 869-2701
製造零件編號4435.0052
BrandSchurter
HK$8.157
/個 (每包:50個)
單位
- 1 - - - TA35 - - - - 2.5mm - 2.5 (Dia.)mm -
RS庫存編號 882-2322
製造零件編號0915852
HK$2,618.25
毎盒:6 個
Box(es)
- - - - - - - - - - - - - -
RS庫存編號 175-1477
製造零件編號GV4LE25S6
HK$3,399.64
單位
25A 3 TeSys 690V ac 116mm GV4LE - - 10 kA @ 660 → 690 V ac - - - - -
RS庫存編號 782-8082
製造零件編號W31-X2M1G-35
HK$224.16
單位
35A 1 - 50 V dc, 240 V ac 0.69in W31 - - - - - - - -
RS庫存編號 175-1486
製造零件編號GV4LE80N
HK$3,240.67
單位
80A 3 TeSys 690V ac 116mm GV4LE - - 8 kA @ 660 → 690 V ac - - - - -
RS庫存編號 899-4363
製造零件編號3B15UM
BrandAltech
HK$398.08
單位
15A 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 Circuits, Electronic Applications, Lighting, Motors, UL508 Applications, Wiring Protection Time Delay 10 kA MCCB - - - -
RS庫存編號 881-1057
製造零件編號CB4-B0-22-615-22C-E
HK$951.15
單位
15A 4 - - - C General Purpose Short 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - 77.2mm 77.22 x 52.37mm 52.4mm
RS庫存編號 899-4574
製造零件編號3C1UM
BrandAltech
HK$398.08
單位
1A 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 282-8771
製造零件編號2210-T210-K0M1-H121-16A
BrandETA
HK$270.13
單位
16A 1 - - 83.5mm 2210 - - - - - - - -
RS庫存編號 782-7868
製造零件編號W69-X2Q12-15
HK$575.86
單位
15A 3 - 277V ac 2.25in W69 - - - - - - - -
RS庫存編號 899-1597
製造零件編號2DU10L
BrandAltech
HK$353.83
單位
10A 2 - - - L Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformer, UL489 Applications Time Delay 10 kA MCCB - - - -
RS庫存編號 899-1771
製造零件編號2E2UM
BrandAltech
HK$295.29
單位
2A 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 175-1582
製造零件編號GV4PEM25S
HK$5,382.50
單位
25A 3 TeSys 690V ac 116mm GV4PEM - - 10 kA @ 660 → 690 V ac - - - - -
RS庫存編號 898-4713
製造零件編號1C60UL
BrandAltech
HK$223.45
單位
60A 1 - 240V ac - UL Control Circuit, Lighting, Low Inrush Motors, Receptacles, Resistive Loads, Wiring Protection Time Delayed 10 kA MCB - - - -