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 Stock No. 899-3240
Mfr. Part No.2CU13L
BrandAltech
£47.08
Each
Units
13A 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. 899-1803
Mfr. Part No.2E50UM
BrandAltech
£25.58
Each
Units
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 Stock No. 899-3433
Mfr. Part No.2D16UM
BrandAltech
£32.55
Each
Units
16A 2 - - - 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. 899-3124
Mfr. Part No.2C3UL
BrandAltech
£41.64
Each
Units
3A 2 - 480Y/277V - UL Lighting and Control Circuit Applications, Low Inrush Motors, Receptacles, Resistive Load, UL489 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS Stock No. 899-4486
Mfr. Part No.3BU32R
BrandAltech
£22.25
Each
Units
32A 3 - 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. 899-8905
Mfr. Part No.3DU63R
BrandAltech
£35.30
Each
Units
63A 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. 899-3155
Mfr. Part No.2C50UL
BrandAltech
£48.23
Each
Units
50A 2 - 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. 898-2509
Mfr. Part No.1BU3R
BrandAltech
£8.39
Each
Units
3A 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 Stock No. 898-4896
Mfr. Part No.1CU5L
BrandAltech
£16.78
Each
Units
5A 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. 898-4919
Mfr. Part No.1CU6L
BrandAltech
£16.78
Each
Units
6A 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. 899-3430
Mfr. Part No.2D1UL
BrandAltech
£51.00
Each
Units
1A 2 - 480Y/277V - UL Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformers Time Delay 10 kA MCCB - - - -
RS Stock No. 899-2893
Mfr. Part No.2B6UM
BrandAltech
£35.30
Each
Units
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 Stock No. 898-1641
Mfr. Part No.1DU16L
BrandAltech
£17.12
Each
Units
16A 1 - 240V ac - L Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformer, UL489 Applications Time Delay 10 kA MCCB - - - -
RS Stock No. 899-2944
Mfr. Part No.2BU20R
BrandAltech
£19.61
Each
Units
20A 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. 899-3348
Mfr. Part No.2CU60L
BrandAltech
£51.00
Each
Units
60A 2 - 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. 898-4947
Mfr. Part No.1D10UM
BrandAltech
£12.59
Each
Units
10A 1 - 42 V dc, 277 V ac - V-EA Heaters, High Inrush Motors, Power Supplies, Reactive Loads, Transformers Time Delayed 10 kA MCB - - - -
RS Stock No. 898-2644
Mfr. Part No.1C30UM
BrandAltech
£12.59
Each
Units
30A 1 - 24 V dc, 277 V ac - V-EA Appliances, Business Equipment, Control Circuit, Lighting, Low Inrush Motors, Wiring Protection Time Delayed 10 kA MCB - - - -
RS Stock No. 898-4767
Mfr. Part No.1CR5L
BrandAltech
£18.16
Each
Units
5A 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. 899-2875
Mfr. Part No.2B50UM
BrandAltech
£40.60
Each
Units
50A 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 Stock No. 898-4745
Mfr. Part No.1CR02L
BrandAltech
£18.16
Each
Units
200mA 1 - 240V ac - L Control Circuit, Lighting, Low Inrush Motors, Receptacles, Resistive Loads, Wiring Protection Time Delayed 10 kA Miniature Molded Case - - - -