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. 409-889
Mfr. Part No.1610-21-10A
BrandETA
$24.16
Each
units
10A 1 - 32V dc 20mm 1610 - - - - - - - -
RS Stock No. 782-8048
Mfr. Part No.W51-A152A1-10
$8.08
Each
units
10A 1 - 250V ac 0.598in W51 - - - - - - - -
RS Stock No. 284-5827
Mfr. Part No.4400.0009
BrandSchurter
$16.91
Each
units
2.5A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 161-7244
Mfr. Part No.0712233
$27.251
Each (In a Box of 20)
units
- - - - - - - - - - - - - -
RS Stock No. 458-8627
Mfr. Part No.3120-F72N-P7T1-A20Q-10A
BrandETA
$54.81
Each
units
10A 2 - - 25mm 3120-F7 - - - - - - - -
RS Stock No. 286-4200
Mfr. Part No.3120-F32F-H7T1-SGRX-8A
BrandETA
$48.34
Each
units
8A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 782-0905
Mfr. Part No.W28-XQ1A-1
$11.29
Each
units
1A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS Stock No. 173-9820
Mfr. Part No.4400.003
BrandSchurter
$9.701
Each (In a Box of 100)
units
10A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 174-5489
Mfr. Part No.3-104-513
BrandSchurter
$4.584
Each (In a Bag of 5)
units
100mA - - 60V dc 6.5mm RTS - - 400 A - - - - -
RS Stock No. 728-8642
Mfr. Part No.106-P10-000040-6A
BrandETA
$27.71
Each
units
6A 1 - - - 106 - - - - - - - -
RS Stock No. 173-9829
Mfr. Part No.4400.0031
BrandSchurter
$9.701
Each (In a Box of 100)
units
12A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 728-8667
Mfr. Part No.1140-E211-P1M1-5A
BrandETA
$21.06
Each
units
5A 1 - - - 1140-E - - - - - - - -
RS Stock No. 712-7632
Mfr. Part No.3120-F551-H7T1-W14DR4-1A
BrandETA
$55.03
Each
units
1A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 458-8683
Mfr. Part No.1180-01-2A
BrandETA
$40.02
Each
units
2A 1 - - 24.4mm 1180 - - - - - - - -
RS Stock No. 125-1367
Mfr. Part No.A9C64416
$664.27
Each
units
16A 4 Acti 9 - - iC60H Commercial, Residential - 15 kA @ 380 → 415 V ac, 30 kA @ 220 → 240 V ac MCB - - - -
RS Stock No. 170-3786
Mfr. Part No.0712217
$27.273
Each (In a Box of 20)
units
2A 1 - 65 V dc, 250 V ac 8.2mm TCP 2A - - - - - - - -
RS Stock No. 284-5883
Mfr. Part No.4400.0052
BrandSchurter
$16.91
Each
units
12A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 782-8079
Mfr. Part No.W51-A122B1-5
$8.45
Each
units
5A 1 - 250V ac 0.598in W51 - - - - - - - -
RS Stock No. 175-1541
Mfr. Part No.GV4PE25N6
$721.41
Each
units
25A 3 TeSys 690V ac 116mm GV4PE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 173-9801
Mfr. Part No.4410.0172
BrandSchurter
$30.27
Each (In a Box of 20)
units
1A 1 - 240V ac - T12 - - - - - - - -
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