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. 868-9030
Mfr. Part No.4430.0022
BrandSchurter
$30.78
Each
units
10A 2 - 60 V dc, 240 V ac - TA45 - - - - - - - -
RS Stock No. 284-5906
Mfr. Part No.4400.0017
BrandSchurter
$14.92
Each
units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 173-9833
Mfr. Part No.4400.0017
BrandSchurter
$8.563
Each (In a Box of 100)
units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 284-5877
Mfr. Part No.4400.0003
BrandSchurter
$14.92
Each
units
10A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 868-9106
Mfr. Part No.4430.0990
BrandSchurter
$56.00
Each
units
6A 2 - 60 V dc, 240 V ac - TA45 - - - - - - - -
RS Stock No. 871-5062
Mfr. Part No.4410.9003
BrandSchurter
$39.10
Each
units
10A 1 - 28 V dc, 240 V ac - T12 Household Appliances, Power Supplies, Power Tools, Uninterruptible Power Supply - 1 kA MCB 22mm - - -
RS Stock No. 173-8101
Mfr. Part No.4410.9003
BrandSchurter
$37.58
Each (In a Box of 10)
units
10A 1 - 28 V dc, 240 V ac - T12 Household Appliances, Power Supplies, Power Tools, Uninterruptible Power Supply - 1 kA MCB 22mm - - -
RS Stock No. 173-9812
Mfr. Part No.4400.0008
BrandSchurter
$8.563
Each (In a Box of 100)
units
1A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 284-5849
Mfr. Part No.4400.0001
BrandSchurter
$14.92
Each
units
4A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 284-5798
Mfr. Part No.4400.0008
BrandSchurter
$14.92
Each
units
1A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 284-6016
Mfr. Part No.4400.0034
BrandSchurter
$11.79
Each
units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 173-9830
Mfr. Part No.4400.0034
BrandSchurter
$8.563
Each (In a Box of 100)
units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 284-6218
Mfr. Part No.4411.0108
BrandSchurter
$31.27
Each
units
20A 1 - 240V ac - T13 - - - - - - - -
RS Stock No. 173-8102
Mfr. Part No.4410.9002
BrandSchurter
$46.30
Each (In a Box of 10)
units
16A 1 - 28 V dc, 240 V ac - T12 Household Appliances, Power Supplies, Power Tools, Uninterruptible Power Supply - 1 kA MCB 19mm - - -
RS Stock No. 871-5069
Mfr. Part No.4410.9002
BrandSchurter
$48.99
Each
units
16A 1 - 28 V dc, 240 V ac - T12 Household Appliances, Power Supplies, Power Tools, Uninterruptible Power Supply - 1 kA MCB 19mm - - -
RS Stock No. 173-9849
Mfr. Part No.4411.0108
BrandSchurter
$27.27
Each (In a Box of 20)
units
20A 1 - 240V ac - T13 - - - - - - - -
RS Stock No. 173-9841
Mfr. Part No.4410.0019
BrandSchurter
$28.634
Each (In a Box of 20)
units
12A 1 - 240V ac - T12 - - - - - - - -
RS Stock No. 173-9802
Mfr. Part No.4410.0126
BrandSchurter
$28.634
Each (In a Box of 20)
units
2 1 - 240V ac - T12 - - - - - - - -
RS Stock No. 284-6072
Mfr. Part No.4410.0126
BrandSchurter
$30.96
Each
units
2A 1 - 240V ac - T12 - - - - - - - -
RS Stock No. 284-6117
Mfr. Part No.4410.0019
BrandSchurter
$32.27
Each
units
12A 1 - 240V ac - T12 - - - - - - - -