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. 312-3780
Mfr. Part No.GB2DB07
$72.34
Each
units
2A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 15 (ac) kA - - - - -
RS Stock No. 416-972
Mfr. Part No.1110-F112-P1M1-3A
BrandETA
$57.42
Each
units
3A 1 - - 19mm 1110 - - - - - - - -
RS Stock No. 335-974
Mfr. Part No.106-P30-000040-4A
BrandETA
$22.64
Each
units
4A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 170-3791
Mfr. Part No.0712275
$21.318
Each (In a Box of 20)
units
6A 1 - 65 V dc, 250 V ac 8.2mm TCP 6A - - - - - - - -
RS Stock No. 782-0927
Mfr. Part No.W58-XB1A4A-7
$8.02
Each
units
7A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 782-0915
Mfr. Part No.W58-XB1A4A-5
$7.57
Each
units
5A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 782-8088
Mfr. Part No.W31-X2M1G-30
$48.94
Each
units
30A 1 - 50 V dc, 240 V ac 0.69in W31 - - - - - - - -
RS Stock No. 344-5327
Mfr. Part No.1658-G21-02-P10-6A
BrandETA
$19.77
Each
units
6A 1 - - 32mm 1658 - - - - - - - -
RS Stock No. 782-8016
Mfr. Part No.W54-XB1A4A10-30
$5.00
Each
units
30A 1 - 250V ac 0.575in W58 - - - - - - - -
RS Stock No. 409-889
Mfr. Part No.1610-21-10A
BrandETA
$21.14
Each
units
10A 1 - 32V dc 20mm 1610 - - - - - - - -
RS Stock No. 272-921
Mfr. Part No.GV3P40
$504.29
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 405-9113
Mfr. Part No.2-5700-IG1-P10-DD-000040-1A
BrandETA
$31.47
Each
units
1A 1 - - 29mm 2-5700 - - - - - - - -
RS Stock No. 868-9106
Mfr. Part No.4430.0990
BrandSchurter
$54.90
Each
units
6A 2 - 60 V dc, 240 V ac - TA45 - - - - - - - -
RS Stock No. 284-5877
Mfr. Part No.4400.0003
BrandSchurter
$15.65
Each
units
10A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 212-1884
Mfr. Part No.3130-F110-P7T1-W02Q-8A
BrandETA
$17.83
Each
units
8A 1 - - 36mm 3130 - - - - - - - -
RS Stock No. 312-3718
Mfr. Part No.GB2CB16
$25.37
Each
units
10A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1.5 kA - - - - -
RS Stock No. 170-3786
Mfr. Part No.0712217
$21.318
Each (In a Box of 20)
units
2A 1 - 65 V dc, 250 V ac 8.2mm TCP 2A - - - - - - - -
RS Stock No. 409-902
Mfr. Part No.1610-21-20A
BrandETA
$31.96
Each
units
20A 1 - 32V dc 20mm 1610 - - - - - - - -
RS Stock No. 416-691
Mfr. Part No.AF1X0038021F2D
$30.79
Each
units
- - - - - - - - - - - - - -
RS Stock No. 871-5062
Mfr. Part No.4410.9003
BrandSchurter
$39.49
Each
units
10A 1 - 28 V dc, 240 V ac - T12 Household Appliances, Power Supplies, Power Tools, Uninterruptible Power Supply - 1 kA MCB 22mm - - -
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