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. 868-8803
Mfr. Part No.4400.0290
BrandSchurter
SGD11.35
Each
units
4A 1 - - - - - - - MCB - - - -
RS Stock No. 869-2711
Mfr. Part No.4435.0056
BrandSchurter
SGD11.89
Each
units
10A 1 - 32 V dc, 240 V ac - TA35 Cleaning Equipment, Commercial and Household Kitchen Appliances, Equipment for Construction, Industrial Appliances, Power Tools - 2 kA MCB - 34mm 34 x 14.5mm 14.5mm
RS Stock No. 868-8796
Mfr. Part No.4400.0098
BrandSchurter
SGD9.584
Each (In a Pack of 100)
units
3 A, 300 mA 1 - 48 V dc, 240 V ac - T11 - - - - - - - -
RS Stock No. 173-9827
Mfr. Part No.4400.005
BrandSchurter
SGD9.177
Each (In a Box of 100)
units
6A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 868-9030
Mfr. Part No.4430.0022
BrandSchurter
SGD34.44
Each
units
10A 2 - 60 V dc, 240 V ac - TA45 - - - - - - - -
RS Stock No. 284-5855
Mfr. Part No.4400.005
BrandSchurter
SGD14.42
Each
units
6A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 868-8914
Mfr. Part No.4411.0011
BrandSchurter
SGD23.92
Each
units
10A 1 - 28 V dc, 240 V ac - T13 - - - - - - - -
RS Stock No. 868-8787
Mfr. Part No.4400.0063
BrandSchurter
SGD15.23
Each
units
1A 1 - 48 V dc, 240 V ac - T11 - - - - - - - -
RS Stock No. 173-9834
Mfr. Part No.4410.0076
BrandSchurter
SGD31.379
Each (In a Box of 20)
units
4A 1 - 240V ac - T12 - - - - - - - -
RS Stock No. 173-9830
Mfr. Part No.4400.0034
BrandSchurter
SGD8.753
Each (In a Box of 100)
units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 284-6117
Mfr. Part No.4410.0019
BrandSchurter
SGD34.52
Each
units
12A 1 - 240V ac - T12 - - - - - - - -
RS Stock No. 868-9355
Mfr. Part No.4435.0041
BrandSchurter
SGD31.29
Each
units
15A 2 - 60 V dc, 240 V ac - TA35 Cleaning Equipment, Commercial and Household Kitchen Appliances, Equipment for Construction, Industrial Appliances, Power Tools - 2 kA MCB - 34mm 34 x 26mm 26mm
RS Stock No. 173-9819
Mfr. Part No.4400.0029
BrandSchurter
SGD8.753
Each (In a Box of 100)
units
8A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 173-9835
Mfr. Part No.4410.0066
BrandSchurter
SGD26.915
Each (In a Box of 20)
units
6A 1 - 240V ac - T12 - - - - - - - -
RS Stock No. 868-9106
Mfr. Part No.4430.0990
BrandSchurter
SGD59.33
Each
units
6A 2 - 60 V dc, 240 V ac - TA45 - - - - - - - -
RS Stock No. 173-9821
Mfr. Part No.4400.0009
BrandSchurter
SGD8.753
Each (In a Box of 100)
units
2.5A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 173-9828
Mfr. Part No.4400.0015
BrandSchurter
SGD8.753
Each (In a Box of 100)
units
8A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 868-9175
Mfr. Part No.4430.2196
BrandSchurter
SGD45.04
Each
units
20A - - 125/250V - ABD - - - MCB - - - -
RS Stock No. 284-6123
Mfr. Part No.4410.0152
BrandSchurter
SGD35.04
Each
units
16A 1 - 240V ac - T12 - - - - - - - -
RS Stock No. 868-9169
Mfr. Part No.4430.2078
BrandSchurter
SGD40.78
Each
units
10A 2 - 60 V dc, 240 V ac - TA45 - - - - - - - -