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. 312-3881
Mfr. Part No.GB2DB22
$65.66
Each
units
20A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1.5 kA - - - - -
RS Stock No. 273-4648
Mfr. Part No.8340-F410-P1M1-A3H0-15A
BrandETA
$75.83
Each
units
15A 1 - 80V dc 50.8mm 8340 - - - - - - - -
RS Stock No. 173-8076
Mfr. Part No.4404.0098
BrandSchurter
$3.941
Each (In a Box of 100)
units
5A 1 - 48 V dc, 240 V ac 19mm T9 - - - - - - - -
RS Stock No. 286-4014
Mfr. Part No.3120-F551-H7T1-W02D-10A
BrandETA
$38.42
Each
units
10A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 782-7912
Mfr. Part No.W93-X112-50
$132.20
Each
units
50A 3 - 277V ac 2.25in W93 - - - - - - - -
RS Stock No. 161-7244
Mfr. Part No.0712233
$24.031
Each (In a Box of 20)
units
- - - - - - - - - - - - - -
RS Stock No. 782-7953
Mfr. Part No.W23-X1A1G-40
$26.42
Each
units
40A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS Stock No. 212-1890
Mfr. Part No.3130-F110-P7T1-W02Q-10A
BrandETA
$42.36
Each
units
10A 1 - - 36mm 3130 - - - - - - - -
RS Stock No. 782-0930
Mfr. Part No.W31-X2M1G-10
$47.95
Each
units
10A 1 - 50 V dc, 240 V ac 0.69in W31 - - - - - - - -
RS Stock No. 323-8983
Mfr. Part No.GB2CD05
$90.58
Each
units
500mA 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
RS Stock No. 801-6905
Mfr. Part No.0712233
$26.32
Each
units
3A 1 - 65 V dc, 250 V ac 8.2mm TCP 3A - - - - - - - -
RS Stock No. 173-9827
Mfr. Part No.4400.005
BrandSchurter
$9.755
Each (In a Box of 100)
units
6A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 122-9296
Mfr. Part No.3400-P10-H-SI-5A
BrandETA
$139.35
Each
units
5A 1 - - 42mm 3400 - - - - - - - -
RS Stock No. 723-4853
Mfr. Part No.ESX10-TB101-DC24V 10A
BrandETA
$231.60
Each
units
10A - - - - ESX10-T - - - - - - - -
RS Stock No. 407-0750
Mfr. Part No.8340-F410-P1M1-A3H0-2.5A
BrandETA
$49.65
Each
units
2.5A 1 - 80V dc 50.8mm 8340 - - - - - - - -
RS Stock No. 768-0880
Mfr. Part No.2800848
$71.45
Each
units
2A 1 TRABTECH - 12.3mm CB TM1 2A M1 P - - - - - - - -
RS Stock No. 830-4293
Mfr. Part No.4404.0098
BrandSchurter
$3.61
Each
units
5A 1 - 48 V dc, 240 V ac 19mm T9 - - - - - - - -
RS Stock No. 406-9485
Mfr. Part No.8340-F410-P1M1-A3H0-25A
BrandETA
$49.81
Each
units
25A 1 - 80V dc 50.8mm 8340 - - - - - - - -
RS Stock No. 173-9842
Mfr. Part No.4410.0152
BrandSchurter
$26.736
Each (In a Box of 20)
units
16A 1 - 240V ac - T12 - - - - - - - -
RS Stock No. 173-8075
Mfr. Part No.4404.0101
BrandSchurter
$3.941
Each (In a Box of 100)
units
8A 1 - 48 V dc, 240 V ac 19mm T9 - - - - - - - -
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