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. 774-0039
BrandRS PRO
$13.47
Each
units
16A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 774-0036
BrandRS PRO
$13.67
Each
units
13A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 774-0042
BrandRS PRO
$9.72
Each
units
5A - - - 14.1mm A-0709 - - - - - - - -
RS Stock No. 774-0045
BrandRS PRO
$10.75
Each
units
6A - - 32 V dc, 240 V ac 14.1mm A-0709 - - - - - - - -
RS Stock No. 774-0020
BrandRS PRO
$13.73
Each
units
8A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 774-0099
BrandRS PRO
$5.69
Each
units
2.2A 2 - 250V ac 6mm AN - - - - - - - -
RS Stock No. 273-0854
Mfr. Part No.1658-G21-02-P10-5A
BrandETA
$17.15
Each
units
5A 1 - - 14mm 1658 - - - - - - - -
RS Stock No. 405-9141
Mfr. Part No.2-5700-IG1-P10-DD-000040-10A
BrandETA
$33.87
Each
units
10A 1 - - 15.7mm 2-5700 - - - - - - - -
RS Stock No. 782-7947
Mfr. Part No.W23-X1A1G-10
$39.27
Each
units
10A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS Stock No. 782-0864
Mfr. Part No.W23-X1A1G-20
$39.19
Each
units
20A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS Stock No. 312-3689
Mfr. Part No.GB2CB12
$38.65
Each
units
6A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 1.5 (ac) kA - - - - -
RS Stock No. 405-9179
Mfr. Part No.2-5700-IG1-P10-DD-000040-20A
BrandETA
$30.73
Each
units
20A 1 - - 15.7mm 2-5700 - - - - - - - -
RS Stock No. 782-0886
Mfr. Part No.W23-X1A1G-5
$39.27
Each
units
5A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS Stock No. 868-9030
Mfr. Part No.4430.0022
BrandSchurter
$33.36
Each
units
10A 2 - 60 V dc, 240 V ac - TA45 - - - - - - - -
RS Stock No. 782-7975
Mfr. Part No.W54-XB1A4A10-15
$5.84
Each
units
15A 1 - 250V ac 0.575in W54 - - - - - - - -
RS Stock No. 782-7931
Mfr. Part No.W57-XB7A4A10-15
$3.69
Each
units
15A 1 - 250V ac 0.575in W57 - - - - - - - -
RS Stock No. 284-5906
Mfr. Part No.4400.0017
BrandSchurter
$15.76
Each
units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 173-9833
Mfr. Part No.4400.0017
BrandSchurter
$8.58
Each (In a Box of 100)
units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 409-895
Mfr. Part No.1610-21-15A
BrandETA
$22.80
Each
units
15A 1 - 32V dc 20mm 1610 - - - - - - - -
RS Stock No. 405-9157
Mfr. Part No.2-5700-IG1-P10-DD-000040-15A
BrandETA
$33.48
Each
units
15A 1 - - 15.7mm 2-5700 - - - - - - - -
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