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. 336-012
Mfr. Part No.106-P30-000040-1A
BrandETA
$30.40
Each
units
1A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 782-7990
Mfr. Part No.W58-XB1A4A-25
$14.06
Each
units
25A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 284-5877
Mfr. Part No.4400.0003
BrandSchurter
$16.91
Each
units
10A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 416-944
Mfr. Part No.1110-F112-P1M1-0.5A
BrandETA
$77.49
Each
units
500mA 1 - - 19mm 1110 - - - - - - - -
RS Stock No. 284-5855
Mfr. Part No.4400.005
BrandSchurter
$15.86
Each
units
6A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 782-8038
Mfr. Part No.W58-XB1A4A-6
$10.18
Each
units
6A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 782-0892
Mfr. Part No.W58-XB1A4A-10
$10.18
Each
units
10A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 729-2782
Mfr. Part No.3120-F554-P7T1-W02D-16A
BrandETA
$53.91
Each
units
16A 2 - - - 3120-F - - - - - - - -
RS Stock No. 782-8022
Mfr. Part No.W58-XB1A4A-4
$10.46
Each
units
4A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 312-3667
Mfr. Part No.GB2CB09
$29.34
Each
units
4A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 6 (ac) kA - - - - -
RS Stock No. 212-1890
Mfr. Part No.3130-F110-P7T1-W02Q-10A
BrandETA
$67.22
Each
units
10A 1 - - 36mm 3130 - - - - - - - -
RS Stock No. 284-5962
Mfr. Part No.4400.0025
BrandSchurter
$16.91
Each
units
4A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 782-7953
Mfr. Part No.W23-X1A1G-40
$37.54
Each
units
40A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS Stock No. 405-9135
Mfr. Part No.2-5700-IG1-P10-DD-000040-7A
BrandETA
$37.61
Each
units
7A 1 - - 29mm 2-5700 - - - - - - - -
RS Stock No. 409-902
Mfr. Part No.1610-21-20A
BrandETA
$36.01
Each
units
20A 1 - 32V dc 20mm 1610 - - - - - - - -
RS Stock No. 774-0115
Mfr. Part No.FC67210
$5.35
Each
units
4A 2 - 250V ac 6mm AN - - - - - - - -
RS Stock No. 335-968
Mfr. Part No.106-P30-000040-5A
BrandETA
$23.60
Each
units
5A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 272-842
Mfr. Part No.GV3L50
$413.46
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 729-2843
Mfr. Part No.3600-P10-Si-6A
BrandETA
$186.68
Each
units
6A 1 - - 11.5mm 3600 - - - - - - - -
RS Stock No. 173-9840
Mfr. Part No.4400.0025
BrandSchurter
$9.701
Each (In a Box of 100)
units
4A 1 - 240V ac - T11 - - - - - - - -
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