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. 173-9840
Mfr. Part No.4400.0025
BrandSchurter
$9.701
Each (In a Box of 100)
units
4A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 782-0876
Mfr. Part No.W23-X1A1G-30
$54.26
Each
units
30A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS Stock No. 286-4008
Mfr. Part No.3120-F551-H7T1-W02D-5A
BrandETA
$37.45
Each
units
5A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 273-0854
Mfr. Part No.1658-G21-02-P10-5A
BrandETA
$9.17
Each
units
5A 1 - - 32mm 1658 - - - - - - - -
RS Stock No. 273-0860
Mfr. Part No.1658-G21-02-P10-10A
BrandETA
$9.17
Each
units
10A 1 - - 32mm 1658 - - - - - - - -
RS Stock No. 272-820
Mfr. Part No.GV3L32
$337.31
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -
RS Stock No. 782-7887
Mfr. Part No.W67-X2Q12-30
$41.72
Each
units
30A 1 - 277V ac 0.75in W67 - - - - - - - -
RS Stock No. 782-8000
Mfr. Part No.W58-XC4C12A-2
$14.25
Each
units
2A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 729-2708
Mfr. Part No.1410-G111-P2F1-S01-1.5A
BrandETA
$21.09
Each
units
1.5A 1 - - - 1410-G1 - - - - - - - -
RS Stock No. 335-996
Mfr. Part No.106-P30-000040-2A
BrandETA
$25.74
Each
units
2A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 284-5782
Mfr. Part No.4400.0059
BrandSchurter
$16.91
Each
units
500mA 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 312-3853
Mfr. Part No.GB2DB16
$91.91
Each
units
10A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1.5 kA - - - - -
RS Stock No. 284-5833
Mfr. Part No.4400.001
BrandSchurter
$16.91
Each
units
3A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 173-8078
Mfr. Part No.4404.0102
BrandSchurter
$4.085
Each (In a Box of 100)
units
10A 1 - 48 V dc, 240 V ac 19mm T9 - - - - - - - -
RS Stock No. 284-5906
Mfr. Part No.4400.0017
BrandSchurter
$16.91
Each
units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 173-9833
Mfr. Part No.4400.0017
BrandSchurter
$9.701
Each (In a Box of 100)
units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 405-9179
Mfr. Part No.2-5700-IG1-P10-DD-000040-20A
BrandETA
$33.28
Each
units
20A 1 - - 29mm 2-5700 - - - - - - - -
RS Stock No. 458-8728
Mfr. Part No.1180-01-6A
BrandETA
$40.02
Each
units
6A 1 - - 24.4mm 1180 - - - - - - - -
RS Stock No. 273-0882
Mfr. Part No.1658-G21-02-P10-15A
BrandETA
$9.17
Each
units
15A 1 - - 32mm 1658 - - - - - - - -
RS Stock No. 782-0915
Mfr. Part No.W58-XB1A4A-5
$11.51
Each
units
5A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
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