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 899-4641
製造零件編號3C4UL
BrandAltech
HK$574.92
單位
4A 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 898-1812
製造零件編號1E3UM
BrandAltech
HK$147.01
單位
3A 1 - 42V dc - 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 899-3048
製造零件編號2C15UM
BrandAltech
HK$295.29
單位
15A 2 - - - 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 899-9018
製造零件編號3G03UM
BrandAltech
HK$442.93
單位
300mA 3 - 480Y/277V - V-EA - Time Delay 10 kA MCCB - - - -
RS庫存編號 739-6872
製造零件編號3120-F521-H7T1-W01D-10A-U0000M
BrandETA
HK$396.00
單位
10A 2 - - 25mm 3120 - - - - - - - -
RS庫存編號 899-8974
製造零件編號3E3UM
BrandAltech
HK$442.93
單位
3A 3 - 480Y/277V - 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 899-8996
製造零件編號3E8UM
BrandAltech
HK$442.93
單位
8A 3 - 480Y/277V - 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 272-842
製造零件編號GV3L50
HK$1,607.37
單位
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS庫存編號 898-1597
製造零件編號1D8UL
BrandAltech
HK$212.16
單位
8A 1 - 277V ac - UL Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformers Time Delay 10 kA MCCB - - - -
RS庫存編號 881-5112
製造零件編號MU1-B-34-625-1-A21-B-C
HK$116.60
單位
25A 1 - - - M Automotive, Communication Equipment, Generators, Marine Applications, Medical Equipment, Power Supplies Medium 600 A @ 80 V dc MCB 9.5mm - 9.53 (Dia.)mm -
RS庫存編號 782-8026
製造零件編號W58-XC4C12A-5
HK$42.55
單位
5A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS庫存編號 899-1819
製造零件編號2E8UM
BrandAltech
HK$295.29
單位
8A 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 899-1689
製造零件編號2DU40R
BrandAltech
HK$176.96
單位
40A 2 - 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 899-1803
製造零件編號2E50UM
BrandAltech
HK$339.52
單位
50A 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 899-2893
製造零件編號2B6UM
BrandAltech
HK$295.29
單位
6A 2 - - - 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 898-2464
製造零件編號1BU12R
BrandAltech
HK$95.81
單位
12A 1 - 48 V dc, 277 V ac - R Appliances, Business Equipment, Control Circuit, Lighting, Power Supplies, Sensitive Electronics, Wiring Protection Time Delayed 10 kA MCB - - - -
RS庫存編號 175-1503
製造零件編號GV4P25B
HK$3,155.70
單位
25A 3 TeSys 690V ac 165mm GV4P - - 10 kA @ 500 V ac - - - - -
RS庫存編號 175-1447
製造零件編號GV4L80N
HK$3,435.12
單位
80A 3 TeSys 690V ac 165mm GV4L - - 8 kA @ 660 → 690 V ac - - - - -
RS庫存編號 881-4983
製造零件編號MA2-B-34-620-1-A14-B-E
HK$290.975
/個 (每包:6個)
單位
20A 2 - - - M Automotive, Communication Equipment, Generators, Marine Applications, Medical Equipment, Power Supplies Medium 600 A @ 80 V dc MCB - 33.8mm 33.76 x 37.08mm 37.1mm
RS庫存編號 175-1563
製造零件編號GV4PEM03S6
HK$5,066.87
單位
3.5A 3 TeSys 690V ac 116mm GV4PEM - - 10 kA @ 660 → 690 V ac - - - - -