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. 712-7657
Mfr. Part No.3120-F551-H7T1-W14DR4-20A
BrandETA
€24.34
Each
units
20A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 344-5361
Mfr. Part No.3140-F130-P7T1-SGRX-5A
BrandETA
€58.93
Each
units
5A 3 - - 61.6mm 3140 - - - - - - - -
RS Stock No. 729-2754
Mfr. Part No.2-5700-IG2-P10-DD-000040-6A
BrandETA
€23.41
Each
units
6A 1 - - - 2 5700 - - - - - - - -
RS Stock No. 173-9827
Mfr. Part No.4400.005
BrandSchurter
€5.866
Each (In a Box of 100)
units
6A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 729-2815
Mfr. Part No.3130-F130-P7T1-W02Q-16A
BrandETA
€33.44
Each
units
16A 3 - - - 3130 - - - - - - - -
RS Stock No. 855-7359
Mfr. Part No.0912020
€731.71
1 Box of 5
Box(es)
- - - - - - - - - - - - - -
RS Stock No. 782-7984
Mfr. Part No.W58-XB1A4A-20
€7.74
Each
units
20A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 286-4165
Mfr. Part No.3120-F521-H7T1-W01D-20A
BrandETA
€36.55
Each
units
20A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 273-0882
Mfr. Part No.1658-G21-02-P10-15A
BrandETA
€7.10
Each
units
15A 1 - - 32mm 1658 - - - - - - - -
RS Stock No. 405-9208
Mfr. Part No.4130-G211-K4M1-30A
BrandETA
€34.44
Each
units
30A 1 - - 32mm 4130 - - - - - - - -
RS Stock No. 286-3982
Mfr. Part No.3120-F551-H7T1-W02D-3A
BrandETA
€20.37
Each
units
3A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 830-3060
Mfr. Part No.GV3P32
€439.34
Each
units
- - - - - - - - - - - - - -
RS Stock No. 286-4020
Mfr. Part No.3120-F551-H7T1-W02D-20A
BrandETA
€26.18
Each
units
20A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 284-6016
Mfr. Part No.4400.0034
BrandSchurter
€9.66
Each
units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 729-2786
Mfr. Part No.3120-F554-P7T1-W02D-20A
BrandETA
€27.48
Each
units
20A 2 - - - 3120-F - - - - - - - -
RS Stock No. 273-4597
Mfr. Part No.8340-F410-P1M1-A3H0-1A
BrandETA
€46.14
Each
units
1A 1 - 80V dc 50.8mm 8340 - - - - - - - -
RS Stock No. 282-8721
Mfr. Part No.2210-T210-K0M1-H121-0.5A
BrandETA
€46.05
Each
units
500mA 1 - - 83.5mm 2210 - - - - - - - -
RS Stock No. 881-1101
Mfr. Part No.CM1-B0-22-410-201-C
€76.297
Each (In a Pack of 3)
units
1A 1 - - - C General Purpose Short 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB 13.1mm - 13.09 (Dia.)mm -
RS Stock No. 729-2773
Mfr. Part No.2-5700-IG2-P10-DD-000040-20A
BrandETA
€23.41
Each
units
20A 1 - - - 2 5700 - - - - - - - -
RS Stock No. 782-6600
Mfr. Part No.W31-X2M1G-1
€44.24
Each
units
1A 1 - 50 V dc, 240 V ac 0.69in W31 - - - - - - - -
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