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. 774-0115
Mfr. Part No.FC67210
PHP167.27
Each
units
4A 2 - 250V ac 6mm AN - - - - - - - -
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. 728-8686
Mfr. Part No.1140-F111-P1M1-16A
BrandETA
PHP667.34
Each
units
16A 1 - - - 1140-F - - - - - - - -
RS Stock No. 712-7650
Mfr. Part No.3120-F551-H7T1-W14DR4-2.5A
BrandETA
PHP1,238.67
Each
units
2.5A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 286-3960
Mfr. Part No.3120-F551-H7T1-W02D-1A
BrandETA
PHP947.53
Each
units
1A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 881-4876
Mfr. Part No.BA2-B0-34-450-121-C
PHP4,317.76
Each (In a Pack of 3)
units
5A 2 - - - B Control Panels, Generator and Welder Markets, Marine Applications, Medical Equipment, Military, Office Equipment, Power Supplies Medium 5000 A @ 120/240 V ac, 5000 A @ 80 V dc MCCB 16mm - - -
RS Stock No. 729-2773
Mfr. Part No.2-5700-IG2-P10-DD-000040-20A
BrandETA
PHP1,114.66
Each
units
20A 1 - - - 2 5700 - - - - - - - -
RS Stock No. 782-7950
Mfr. Part No.W58-XC4C12A-10
PHP315.43
Each
units
10A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
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. 729-2770
Mfr. Part No.3120-F554-P7T1-W02D-5A
BrandETA
PHP1,435.39
Each
units
5A 2 - - - 3120-F - - - - - - - -
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. 273-0882
Mfr. Part No.1658-G21-02-P10-15A
BrandETA
PHP387.60
Each
units
15A 1 - - 32mm 1658 - - - - - - - -
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. 344-5361
Mfr. Part No.3140-F130-P7T1-SGRX-5A
BrandETA
PHP2,462.83
Each
units
5A 3 - - 61.6mm 3140 - - - - - - - -
RS Stock No. 782-7984
Mfr. Part No.W58-XB1A4A-20
PHP303.49
Each
units
20A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
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. 881-4835
Mfr. Part No.BA1-B0-34-450-121-D
PHP753.96
Each
units
5A 1 - - - B Control Panels, Generator and Welder Markets, Marine Applications, Medical Equipment, Military, Office Equipment, Power Supplies Medium 5000 A @ 120 V ac, 5000 A @ 80 V dc MCCB 16mm - - -
RS Stock No. 870-1063
Mfr. Part No.TS-709-5H
BrandSchurter
PHP125.882
Each (In a Pack of 200)
units
5A 1 - 32 V dc, 250 V ac - TS-709 - - 1000 A MCB 11.1mm 10.3mm 10.3 x 11.1 (Dia.)mm -
RS Stock No. 286-0832
Mfr. Part No.3120-F521-H7T1-W01D-5A
BrandETA
PHP1,287.50
Each
units
5A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 712-7676
Mfr. Part No.3120-F551-H7T1-W14DR4-5A
BrandETA
PHP1,258.81
Each
units
5A 2 - - 25mm 3120 - - - - - - - -
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