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 Breaking Capacity at Maximum Voltage Rating Circuit Breaker Type Mounting Hole Diameter Mounting Hole Length Mounting Hole Size Mounting Hole Width Mounting Style
RS Stock No. 273-0854
Mfr. Part No.1658-G21-02-P10-5A
BrandETA
$18.01
Each
units
5A 1 - - 14mm 1658 - - - - - - - Panel Mount
RS Stock No. 405-9141
Mfr. Part No.2-5700-IG1-P10-DD-000040-10A
BrandETA
$36.28
Each
units
10A 1 - - 15.7mm 2-5700 - - - - - - - Panel Mount
RS Stock No. 782-7947
Mfr. Part No.W23-X1A1G-10
$59.11
Each
units
10A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS Stock No. 782-0864
Mfr. Part No.W23-X1A1G-20
$64.99
Each
units
20A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS Stock No. 312-3689
Mfr. Part No.GB2CB12
$40.60
Each
units
6A 1 - 277 V ac, 415 V ac 15mm GB2 - 1 (dc) kA, 1.5 (ac) kA - - - - - DIN Rail Mount
RS Stock No. 405-9179
Mfr. Part No.2-5700-IG1-P10-DD-000040-20A
BrandETA
$32.91
Each
units
20A 1 - - 15.7mm 2-5700 - - - - - - - Panel Mount
RS Stock No. 782-0886
Mfr. Part No.W23-X1A1G-5
$47.06
Each
units
5A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS Stock No. 868-9030
Mfr. Part No.4430.0022
BrandSchurter
$35.05
Each
units
10A 2 - 60 V dc, 240 V ac - TA45 - - - - - - - Panel Mount
RS Stock No. 782-7931
Mfr. Part No.W57-XB7A4A10-15
$5.61
Each
units
15A 1 - 250V ac 0.575in W57 - - - - - - - -
RS Stock No. 782-7975
Mfr. Part No.W54-XB1A4A10-15
$6.37
Each
units
15A 1 - 250V ac 0.575in W54 - - - - - - - -
RS Stock No. 284-5906
Mfr. Part No.4400.0017
BrandSchurter
$16.56
Each
units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 173-9833
Mfr. Part No.4400.0017
BrandSchurter
$9.28
Each (In a Box of 100)
units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 273-0860
Mfr. Part No.1658-G21-02-P10-10A
BrandETA
$9.97
Each
units
10A 1 - - 14mm 1658 - - - - - - - Panel Mount
RS Stock No. 801-6892
Mfr. Part No.0712194
$31.73
Each
units
1A 1 - 65 V dc, 250 V ac 8.2mm TCP 1A - - - - - - - -
RS Stock No. 405-9157
Mfr. Part No.2-5700-IG1-P10-DD-000040-15A
BrandETA
$35.86
Each
units
15A 1 - - 15.7mm 2-5700 - - - - - - - Panel Mount
RS Stock No. 170-3783
Mfr. Part No.0712194
$27.464
Each (In a Box of 20)
units
1A 1 - 65 V dc, 250 V ac 8.2mm TCP1A - - - - - - - -
RS Stock No. 409-895
Mfr. Part No.1610-21-15A
BrandETA
$23.48
Each
units
15A 1 - 32V dc 20mm 1610 - - - - - - - -
RS Stock No. 312-3667
Mfr. Part No.GB2CB09
$41.82
Each
units
4A 1 - 277 V ac, 415 V ac 15mm GB2 - 1 (dc) kA, 6 (ac) kA - - - - - DIN Rail Mount
RS Stock No. 782-0918
Mfr. Part No.W58-XB1A4A-30
$13.47
Each
units
30A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 405-9214
Mfr. Part No.4130-G211-K4M1-35A
BrandETA
$124.51
Each
units
35A 1 - - 18mm 4130 - - - - - - - Panel Mount