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. 739-6884
Mfr. Part No.3120-F521-H7T1-W01D-15A-U0000M
BrandETA
$96.80
Each
units
15A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 173-9823
Mfr. Part No.4400.001
BrandSchurter
$9.703
Each (In a Box of 100)
units
3A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 830-4300
Mfr. Part No.4404.0102
BrandSchurter
$6.25
Each
units
10A 1 - 48 V dc, 240 V ac 19mm T9 - - - - - - - -
RS Stock No. 782-0886
Mfr. Part No.W23-X1A1G-5
$48.42
Each
units
5A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS Stock No. 729-2789
Mfr. Part No.3120-F554-P7T1-W02D-10A
BrandETA
$56.44
Each
units
10A 2 - - - 3120-F - - - - - - - -
RS Stock No. 286-0832
Mfr. Part No.3120-F521-H7T1-W01D-5A
BrandETA
$50.83
Each
units
5A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 782-7969
Mfr. Part No.W54-XB1A4A10-10
$6.99
Each
units
10A 1 - 250V ac 0.575in W54 - - - - - - - -
RS Stock No. 774-0033
Mfr. Part No.FC6624
$9.41
Each
units
4A - - - 14.1mm A-0709 - - - - - - - -
RS Stock No. 416-691
Mfr. Part No.AF1X0038021F2D
$36.33
Each
units
- - - - - - - - - - - - - -
RS Stock No. 409-750
Mfr. Part No.1410-L210-L2F1-S02-0.63A
BrandETA
$23.29
Each
units
630mA 1 - - 33mm 1410-L - - - - - - - -
RS Stock No. 335-974
Mfr. Part No.106-P30-000040-4A
BrandETA
$23.52
Each
units
4A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 782-7846
Mfr. Part No.W68-X2Q12-10
$84.47
Each
units
10A 2 - 277V ac 1.5in W68 - - - - - - - -
RS Stock No. 122-9319
Mfr. Part No.3400-P10-H-SI-15A
BrandETA
$97.02
Each
units
15A 1 - - 42mm 3400 - - - - - - - -
RS Stock No. 417-026
Mfr. Part No.1110-F112-P1M1-16A
BrandETA
$69.70
Each
units
16A 1 - - 19mm 1110 - - - - - - - -
RS Stock No. 344-5327
Mfr. Part No.1658-G21-02-P10-6A
BrandETA
$9.18
Each
units
6A 1 - - 32mm 1658 - - - - - - - -
RS Stock No. 458-8712
Mfr. Part No.1180-01-4A
BrandETA
$40.02
Each
units
4A 1 - - 24.4mm 1180 - - - - - - - -
RS Stock No. 150-085
Mfr. Part No.1610-21-30A
BrandETA
$15.10
Each
units
30A 1 - 32V dc 20mm 1610 - - - - - - - -
RS Stock No. 782-7997
Mfr. Part No.W28-XQ1A-20
$7.13
Each
units
20A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS Stock No. 782-7947
Mfr. Part No.W23-X1A1G-10
$47.73
Each
units
10A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS Stock No. 272-943
Mfr. Part No.GV3P50
$383.93
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
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