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. 855-7399
Mfr. Part No.2800913
HK$345.14
Each
units
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RS Stock No. 855-7403
Mfr. Part No.2800927
HK$376.38
Each
units
- - - - - - - - - - - - - -
RS Stock No. 768-0852
Mfr. Part No.2800839
HK$321.44
Each
units
4A 1 TRABTECH - 12.3mm CB TM1 4A SFB P - - - - - - - -
RS Stock No. 855-7393
Mfr. Part No.2800914
HK$345.14
Each
units
- - - - - - - - - - - - - -
RS Stock No. 170-3791
Mfr. Part No.0712275
HK$137.43
Each (In a Box of 20)
units
6A 1 - 65 V dc, 250 V ac 8.2mm TCP 6A - - - - - - - -
RS Stock No. 768-0864
Mfr. Part No.2800841
HK$313.68
Each
units
6A 1 TRABTECH - 12.3mm CB TM1 6A SFB P - - - - - - - -
RS Stock No. 768-0880
Mfr. Part No.2800848
HK$313.68
Each
units
2A 1 TRABTECH - 12.3mm CB TM1 2A M1 P - - - - - - - -
RS Stock No. 161-7244
Mfr. Part No.0712233
HK$151.346
Each (In a Box of 20)
units
- - - - - - - - - - - - - -
RS Stock No. 801-6983
Mfr. Part No.0914099
HK$735.05
Each
units
2A 1 - 65 V dc, 250 V ac 12.5mm TMC 1 - - - - - - - -
RS Stock No. 170-3784
Mfr. Part No.0712123
HK$151.346
Each (In a Box of 20)
units
250mA 1 - 65 V dc, 250 V ac 8.2mm TCP 0.25A - - - - - - - -
RS Stock No. 881-8146
Mfr. Part No.1687273
HK$171.783
Each (In a Box of 10)
units
- - - - - HC-B 16-SD-FQT/FS - - - - - - - -
RS Stock No. 801-6905
Mfr. Part No.0712233
HK$150.60
Each
units
3A 1 - 65 V dc, 250 V ac 8.2mm TCP 3A - - - - - - - -
RS Stock No. 881-0372
Mfr. Part No.1656657
HK$94.49
Each
units
- - - - - VS-SI-FP-BP - - - - - - - -
RS Stock No. 801-7028
Mfr. Part No.0914439
HK$735.05
Each
units
1A 1 - 65 V dc, 250 V ac 12.5mm TMC M1 - - - - - - - -
RS Stock No. 881-8278
Mfr. Part No.1689556
HK$11,200.00
1 Box of 10000
Box(es)
- - - - - VS-ST-CD-1.0/14.8/0.5-R - - - - - - - -
RS Stock No. 855-7368
Mfr. Part No.0912033
HK$5,734.90
1 Box of 5
Box(es)
- - - - - - - - - - - - - -
RS Stock No. 768-1025
Mfr. Part No.2800889
HK$627.48
Each
units
16A 2 TRABTECH - 24.6mm CB TM2 16A M1 P - - - - - - - -
RS Stock No. 881-8228
Mfr. Part No.1688887
HK$64.777
Each (In a Box of 10)
units
- - - - - VS-15-BU-DSUB-EG - - - - - - - -
RS Stock No. 882-2322
Mfr. Part No.0915852
HK$3,844.74
1 Box of 6
Box(es)
- - - - - - - - - - - - - -
RS Stock No. 881-8272
Mfr. Part No.1689569
HK$12,000.00
1 Box of 10000
Box(es)
- - - - - VS-BU-CD-1.0/14.4/0.5-R - - - - - - - -