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.


...
Read more Read less

Filters

Viewing 1 - 20 of 498 products
Results per page
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 Stock No. 898-4827
Mfr. Part No.1CU1L
BrandAltech
TWD754.00
Each
units
1A 1 - 240V ac - L Control Circuit, Lighting, Low Inrush Motors, Receptacles, Resistive Loads, Wiring Protection Time Delayed 10 kA Miniature Molded Case - - - -
RS Stock No. 899-4818
Mfr. Part No.3CU40L
BrandAltech
TWD2,160.00
Each
units
40A 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 Stock No. 899-8784
Mfr. Part No.3DU10L
BrandAltech
TWD2,788.00
Each
units
10A 3 - - - L Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformer, UL489 Applications Time Delay 10 kA MCCB - - - -
RS Stock No. 899-1658
Mfr. Part No.2DU30L
BrandAltech
TWD1,330.00
Each
units
30A 2 - - - L Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformer, UL489 Applications Time Delay 10 kA MCCB - - - -
RS Stock No. 899-1881
Mfr. Part No.2G20UM
BrandAltech
TWD997.00
Each
units
20A 2 - - - V-EA - Time Delay 10 kA MCCB - - - -
RS Stock No. 899-8902
Mfr. Part No.3DU6R
BrandAltech
TWD1,322.00
Each
units
6A 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 Stock No. 899-1670
Mfr. Part No.2DU40L
BrandAltech
TWD1,440.00
Each
units
40A 2 - 240V ac - L Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformer, UL489 Applications Time Delay 10 kA MCCB - - - -
RS Stock No. 899-3571
Mfr. Part No.2Z30UM
BrandAltech
TWD2,127.00
Each
units
30A 2 - - - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, Components which Fail-Short, Components/Devices with Low Surge Current and Short Circuit Withstand Capabilities, Semiconductors, UL508 Application Time Delay 10 kA MCCB - - - -
RS Stock No. 899-4672
Mfr. Part No.3C5UM
BrandAltech
TWD1,495.00
Each
units
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 Stock No. 899-8728
Mfr. Part No.3D5UM
BrandAltech
TWD2,382.00
Each
units
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, Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformers, UL508 Application Time Delay 10 kA MCCB - - - -
RS Stock No. 899-3326
Mfr. Part No.2CU4L
BrandAltech
TWD1,952.00
Each
units
4A 2 - - - L Lighting and Control Circuit Applications, Low Inrush Motors, Receptacles, Resistive Load, UL489 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS Stock No. 899-3048
Mfr. Part No.2C15UM
BrandAltech
TWD1,587.00
Each
units
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 Stock No. 899-9107
Mfr. Part No.3P16UL3/12
BrandAltech
TWD980.00
Each
units
115A - - - - 3P16 - - - - - - - -
RS Stock No. 899-8731
Mfr. Part No.3D60UL
BrandAltech
TWD3,156.00
Each
units
60A 3 - 240V ac - UL Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformers Time Delay 10 kA MCCB - - - -
RS Stock No. 899-2991
Mfr. Part No.2BU8R
BrandAltech
TWD1,059.00
Each
units
8A 2 - 480Y/277V - R Appliance Circuit, Appliances, Business Equipment, Control Circuits and Some Electronic Applications, Lighting, Power Supplies, Sensitive Electronics, UL1077 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS Stock No. 899-4657
Mfr. Part No.3C50UL
BrandAltech
TWD2,326.00
Each
units
50A 3 - 240V ac - UL Lighting and Control Circuit Applications, Low Inrush Motors, Receptacles, Resistive Load, UL489 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS Stock No. 899-4786
Mfr. Part No.3CU30L
BrandAltech
TWD1,994.00
Each
units
30A 3 - - - L Lighting and Control Circuit Applications, Low Inrush Motors, Receptacles, Resistive Load, UL489 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS Stock No. 898-1944
Mfr. Part No.1P16UL3/18
BrandAltech
TWD845.00
Each
units
115A - - - - IP16 - - - - - - - -
RS Stock No. 899-3329
Mfr. Part No.2CU4R
BrandAltech
TWD882.00
Each
units
4A 2 - 480Y/277V - R Appliance Circuit, Appliances, Business Equipment, Control Circuit Application, Lighting, Power Supplies, Sensitive Electronics, UL1077 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS Stock No. 898-1604
Mfr. Part No.1DR15L
BrandAltech
TWD833.00
Each
units
15A 1 - 240V ac - L Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformer, UL489 Applications Time Delay 10 kA MCCB - - - -