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. 284-5906
Mfr. Part No.4400.0017
BrandSchurter
R 135.27
Each
units
16A 1 - 240V ac - T11 - - - - - - - -
RS stock no. 173-9830
Mfr. Part No.4400.0034
BrandSchurter
R 100.719
Each (In a Box of 100)
units
16A 1 - 240V ac - T11 - - - - - - - -
RS stock no. 782-7988
Mfr. Part No.W54-XB1A4A10-20
R 62.63
Each
units
20A 1 - 250V ac 0.575in W54 - - - - - - - -
RS stock no. 286-0832
Mfr. Part No.3120-F521-H7T1-W01D-5A
BrandETA
R 470.89
Each
units
5A 2 - - 25mm 3120 - - - - - - - -
RS stock no. 782-7962
Mfr. Part No.W58-XB1A4A-12
R 126.85
Each
units
12A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS stock no. 782-7990
Mfr. Part No.W58-XB1A4A-25
R 106.81
Each
units
25A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS stock no. 899-1771
Mfr. Part No.2E2UM
BrandAltech
R 500.32
Each
units
2A 2 - - - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, High Efficiency Motors, UL508 Application, Which have Exceedingly High Inrush Current Time Delay 10 kA MCCB - - - -
RS stock no. 173-9819
Mfr. Part No.4400.0029
BrandSchurter
R 100.542
Each (In a Box of 100)
units
8A 1 - 240V ac - T11 - - - - - - - -
RS stock no. 416-944
Mfr. Part No.1110-F112-P1M1-0.5A
BrandETA
R 378.12
Each
units
500mA 1 - - 19mm 1110 - - - - - - - -
RS stock no. 782-0864
Mfr. Part No.W23-X1A1G-20
R 515.35
Each
units
20A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS stock no. 170-3784
Mfr. Part No.0712123
R 419.40
Each (In a Box of 20)
units
250mA 1 - 65 V dc, 250 V ac 8.2mm TCP 0.25A - - - - - - - -
RS stock no. 405-9129
Mfr. Part No.2-5700-IG1-P10-DD-000040-2.5A
BrandETA
R 307.73
Each
units
2.5A 1 - - 15.7mm 2-5700 - - - - - - - -
RS stock no. 284-6016
Mfr. Part No.4400.0034
BrandSchurter
R 167.90
Each
units
16A 1 - 240V ac - T11 - - - - - - - -
RS stock no. 312-3869
Mfr. Part No.GB2DB20
R 935.88
Each
units
12A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1.5 kA - - - - -
RS stock no. 729-2758
Mfr. Part No.2-5700-IG2-P10-DD-000040-10A
BrandETA
R 400.42
Each
units
10A 1 - - 15.7mm 2 5700 - - - - - - - -
RS stock no. 409-873
Mfr. Part No.1610-21-8A
BrandETA
R 236.24
Each
units
8A 1 - 32V dc 20mm 1610 - - - - - - - -
RS stock no. 774-0020
BrandRS PRO
R 138.49
Each
units
8A - - - 11mm A-0709 - - - - - - - -
RS stock no. 782-7997
Mfr. Part No.W28-XQ1A-20
R 56.65
Each
units
20A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS stock no. 122-9268
Mfr. Part No.3400-P10-H-SI-0.5A
BrandETA
R 1,046.31
Each
units
500mA 1 - - 14.5mm 3400 - - - - - - - -
RS stock no. 782-8041
Mfr. Part No.W58-XB1A4A-8
R 135.36
Each
units
8A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -