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. 409-889
Mfr. Part No.1610-21-10A
BrandETA
HK$65.16
Each
units
10A 1 - 32V dc 20mm 1610 - - - - - - - -
RS Stock No. 335-980
Mfr. Part No.106-P30-000040-3A
BrandETA
HK$85.15
Each
units
3A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 782-8098
Mfr. Part No.W31-X2M1G-50
HK$273.20
Each
units
50A 1 - 50 V dc, 240 V ac 0.69in W31 - - - - - - - -
RS Stock No. 323-8999
Mfr. Part No.GB2CD06
HK$536.36
Each
units
1A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
RS Stock No. 273-0854
Mfr. Part No.1658-G21-02-P10-5A
BrandETA
HK$46.21
Each
units
5A 1 - - 32mm 1658 - - - - - - - -
RS Stock No. 286-4137
Mfr. Part No.3120-F521-H7T1-W01D-10A
BrandETA
HK$298.70
Each
units
10A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 458-8728
Mfr. Part No.1180-01-6A
BrandETA
HK$126.76
Each
units
6A 1 - - 24.4mm 1180 - - - - - - - -
RS Stock No. 122-9319
Mfr. Part No.3400-P10-H-SI-15A
BrandETA
HK$568.22
Each
units
15A 1 - - 42mm 3400 - - - - - - - -
RS Stock No. 286-4159
Mfr. Part No.3120-F521-H7T1-W01D-16A
BrandETA
HK$298.70
Each
units
16A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 405-9157
Mfr. Part No.2-5700-IG1-P10-DD-000040-15A
BrandETA
HK$130.44
Each
units
15A 1 - - 29mm 2-5700 - - - - - - - -
RS Stock No. 286-4014
Mfr. Part No.3120-F551-H7T1-W02D-10A
BrandETA
HK$186.47
Each
units
10A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 344-5361
Mfr. Part No.3140-F130-P7T1-SGRX-5A
BrandETA
HK$518.58
Each
units
5A 3 - - 61.6mm 3140 - - - - - - - -
RS Stock No. 729-2782
Mfr. Part No.3120-F554-P7T1-W02D-16A
BrandETA
HK$251.38
Each
units
16A 2 - - - 3120-F - - - - - - - -
RS Stock No. 273-0882
Mfr. Part No.1658-G21-02-P10-15A
BrandETA
HK$46.23
Each
units
15A 1 - - 32mm 1658 - - - - - - - -
RS Stock No. 335-968
Mfr. Part No.106-P30-000040-5A
BrandETA
HK$85.43
Each
units
5A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 409-867
Mfr. Part No.1610-21-6A
BrandETA
HK$63.75
Each
units
6A 1 - 32V dc 20mm 1610 - - - - - - - -
RS Stock No. 312-3780
Mfr. Part No.GB2DB07
HK$300.06
Each
units
2A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 15 (ac) kA - - - - -
RS Stock No. 881-1328
Mfr. Part No.EA3-B0-24-810-22A-DC
HK$1,038.52
Each
units
100A 3 - - - E Generators, Ideal for Higher Current and Voltage Applications, Industrial Appliances, Military, Renewable Energy Systems Medium 5000 A @ 125 V dc, 5000 A @ 240 Vac MCCB - 79.7mm 79.7 x 69.85mm 69.9mm
RS Stock No. 729-2764
Mfr. Part No.2-5700-IG2-P10-DD-000040-16A
BrandETA
HK$206.03
Each
units
16A 1 - - - 2 5700 - - - - - - - -
RS Stock No. 409-851
Mfr. Part No.1410-F110-P1F1-W14QB4-8A
BrandETA
HK$157.33
Each
units
8A 1 - - 17mm 1410-F - - - - - - - -
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