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. 899-1869
Mfr. Part No.2G12UM
BrandAltech
PHP1,673.37
Each
units
12A 2 - - - V-EA - Time Delay 10 kA MCCB - - - -
RS Stock No. 899-8882
Mfr. Part No.3DU50R
BrandAltech
PHP1,776.24
Each
units
50A 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. 898-1727
Mfr. Part No.1DU5R
BrandAltech
PHP574.52
Each
units
5A 1 - - - R Appliance Circuit, Control Transformers, Power Supplies, Power Supplies and Reactive Loads, Sensitive Electronics, UL1077 Application Time Delay 10 kA MCCB - - - -
RS Stock No. 899-8747
Mfr. Part No.3D63UL
BrandAltech
PHP4,143.60
Each
units
63A 3 - 240V ac - UL Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformers Time Delay 10 kA MCCB - - - -
RS Stock No. 899-1664
Mfr. Part No.2DU32R
BrandAltech
PHP1,115.58
Each
units
32A 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 Stock No. 899-1591
Mfr. Part No.2DU10R
BrandAltech
PHP1,115.58
Each
units
10A 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 Stock No. 899-4499
Mfr. Part No.3BU5R
BrandAltech
PHP1,673.37
Each
units
5A 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. 899-4742
Mfr. Part No.3CU15L
BrandAltech
PHP3,346.75
Each
units
15A 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. 899-2944
Mfr. Part No.2BU20R
BrandAltech
PHP1,302.52
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. 898-1673
Mfr. Part No.1DU30L
BrandAltech
PHP1,034.14
Each
units
30A 1 - 240V ac - L Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformer, UL489 Applications Time Delay 10 kA MCCB - - - -
RS Stock No. 898-2503
Mfr. Part No.1BU40R
BrandAltech
PHP574.52
Each
units
40A 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. 899-1626
Mfr. Part No.2DU16R
BrandAltech
PHP1,115.58
Each
units
16A 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 Stock No. 898-3240
Mfr. Part No.15.904U
BrandAltech
PHP4,261.36
Each
units
630mA 3 - 480Y/277V - MA 3 Phase Transformers, Motors, Power Supplies Time Delayed 42 kA MCB - - - -
RS Stock No. 899-8797
Mfr. Part No.3DU12L
BrandAltech
PHP3,552.68
Each
units
12A 3 - - - L Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformer, UL489 Applications Time Delay 10 kA MCCB - - - -
RS Stock No. 898-1569
Mfr. Part No.1D5UM
BrandAltech
PHP861.79
Each
units
5A 1 - 42V dc - 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. 899-4798
Mfr. Part No.3CU32L
BrandAltech
PHP3,346.75
Each
units
32A 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. 899-2856
Mfr. Part No.2B30UM
BrandAltech
PHP1,776.24
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, Appliances, Business Equipment, Control Circuits, Electronic Applications, Lighting, Motors, UL508 Applications, Wiring Protection Time Delay 10 kA MCCB - - - -
RS Stock No. 898-2010
Mfr. Part No.1Z1UM
BrandAltech
PHP1,640.03
Each
units
1A 1 - 42V dc - 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. 899-3363
Mfr. Part No.2CU8R
BrandAltech
PHP1,183.67
Each
units
8A 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. 899-4650
Mfr. Part No.3C4UM
BrandAltech
PHP2,510.06
Each
units
4A 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 - - - -