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. 768-0937
Mfr. Part No.2800862
$67.23
Each
units
5A 1 TRABTECH - 12.3mm CB TM1 5A F1 P - - - - - - - -
RS Stock No. 175-1463
Mfr. Part No.GV4LE115B6
$611.66
Each
units
115A 3 TeSys 690V ac 116mm GV4LE - - 10 kA @ 500 V ac - - - - -
RS Stock No. 729-2767
Mfr. Part No.2-5700-IG2-P10-DD-000040-12A
BrandETA
$43.91
Each
units
12A 1 - - - 2 5700 - - - - - - - -
RS Stock No. 175-1461
Mfr. Part No.GV4LE07S6
$711.05
Each
units
7A 3 TeSys 690V ac 116mm GV4LE - - 10 kA @ 660 → 690 V ac - - - - -
RS Stock No. 729-2704
Mfr. Part No.1410-G111-P2F1-S01-1A
BrandETA
$20.70
Each
units
1A 1 - - - 1410-G1 - - - - - - - -
RS Stock No. 175-1590
Mfr. Part No.GV4PEM80B
$790.38
Each
units
80A 3 TeSys 690V ac 116mm GV4PEM - - 10 kA @ 500 V ac - - - - -
RS Stock No. 405-9270
Mfr. Part No.8340-F410-P1M1-A3H0-40A
BrandETA
$70.86
Each
units
40A 1 - 80V dc 50.8mm 8340 - - - - - - - -
RS Stock No. 282-8787
Mfr. Part No.2210-T210-K0M1-H121-25A
BrandETA
$75.36
Each
units
25A 1 - - 83.5mm 2210 - - - - - - - -
RS Stock No. 175-1439
Mfr. Part No.GV4L25N
$668.18
Each
units
25A 3 TeSys 690V ac 165mm GV4L - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1556
Mfr. Part No.GV4PEM02N
$914.87
Each
units
2A 3 TeSys 690V ac 116mm GV4PEM - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 284-5827
Mfr. Part No.4400.0009
BrandSchurter
$16.75
Each
units
2.5A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 173-9832
Mfr. Part No.4400.0052
BrandSchurter
$10.496
Each (In a Box of 100)
units
12A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 728-8626
Mfr. Part No.105-P10-3A
BrandETA
$24.10
Each
units
3A 1 - - - 105 - - - - - - - -
RS Stock No. 801-6909
Mfr. Part No.0712259
$34.13
Each
units
4A 1 - 65 V dc, 250 V ac 8.2mm TCP 4A - - - - - - - -
RS Stock No. 175-1497
Mfr. Part No.GV4P115B6
$795.21
Each
units
115A 3 TeSys 690V ac 165mm GV4P - - 10 kA @ 500 V ac - - - - -
RS Stock No. 175-1534
Mfr. Part No.GV4PE12N
$736.79
Each
units
12.5A 3 TeSys 690V ac 116mm GV4PE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 801-6983
Mfr. Part No.0914099
$165.94
Each
units
2A 1 - 65 V dc, 250 V ac 12.5mm TMC 1 - - - - - - - -
RS Stock No. 175-1537
Mfr. Part No.GV4PE12S6
$852.85
Each
units
12.5A 3 TeSys 690V ac 116mm GV4PE - - 10 kA @ 660 → 690 V ac - - - - -
RS Stock No. 881-8247
Mfr. Part No.1688939
$6.36
Each (In a Box of 10)
units
- - - - - VS-15-ST-DSUB-CD-OG - - - - - - - -
RS Stock No. 409-895
Mfr. Part No.1610-21-15A
BrandETA
$24.71
Each
units
15A 1 - 32V dc 20mm 1610 - - - - - - - -
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