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. 768-0906
Mfr. Part No.2800852
€35.65
Each
units
6A 1 TRABTECH - 12.3mm CB TM1 6A M1 P - - - - - - - -
RS Stock No. 344-5327
Mfr. Part No.1658-G21-02-P10-6A
BrandETA
€8.21
Each
units
6A 1 - - 32mm 1658 - - - - - - - -
RS Stock No. 782-0911
Mfr. Part No.W28-XQ1A-3
€3.35
Each
units
3A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS Stock No. 868-8914
Mfr. Part No.4411.0011
BrandSchurter
€15.29
Each
units
10A 1 - 28 V dc, 240 V ac - T13 - - - - - - - -
RS Stock No. 881-1079
Mfr. Part No.CLB-153-11A3N-B-A
€2.739
Each (In a Pack of 10)
units
15A 1 - - - CLB Audio Visual Equipment, Household Appliances, Marine Applications, Medical Equipment, Power Strips, Power Supplies, Transportation Time Delayed 2500 A @ 32 V dc - - 10mm 10 x 11.2mm 11.2mm
RS Stock No. 881-1145
Mfr. Part No.CMB-073-11C3N-B-A
€1.968
Each (In a Pack of 10)
units
7A 1 - - - CMB Audio Visual Equipment, Household Appliances, Marine Applications, Medical Equipment, Power Strips, Power Supplies, Transportation Time Delayed 2500 A @ 32 V dc - - 10mm 10 x 11.2mm 11.2mm
RS Stock No. 394-9166
Mfr. Part No.LXD1B7
€22.78
Each
units
- - - - - - - - - - - - - -
RS Stock No. 284-5849
Mfr. Part No.4400.0001
BrandSchurter
€9.74
Each
units
4A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 409-895
Mfr. Part No.1610-21-15A
BrandETA
€14.34
Each
units
15A 1 - 32V dc 20mm 1610 - - - - - - - -
RS Stock No. 782-7969
Mfr. Part No.W54-XB1A4A10-10
€4.29
Each
units
10A 1 - 250V ac 0.575in W54 - - - - - - - -
RS Stock No. 881-1148
Mfr. Part No.CMB-123-11C3N-B-A
€1.89
Each (In a Pack of 10)
units
12A 1 - - - CMB Audio Visual Equipment, Household Appliances, Marine Applications, Medical Equipment, Power Strips, Power Supplies, Transportation Time Delayed 2500 A @ 32 V dc - - 10mm 10 x 11.2mm 11.2mm
RS Stock No. 782-7962
Mfr. Part No.W58-XB1A4A-12
€7.00
Each
units
12A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 212-1941
Mfr. Part No.3130-F120-P7T1-W02Q-3A
BrandETA
€31.57
Each
units
3A 2 - - 36mm 3130 - - - - - - - -
RS Stock No. 729-2760
Mfr. Part No.2-5700-IG2-P10-DD-000040-15A
BrandETA
€23.41
Each
units
15A 1 - - - 2 5700 - - - - - - - -
RS Stock No. 273-0854
Mfr. Part No.1658-G21-02-P10-5A
BrandETA
€8.21
Each
units
5A 1 - - 32mm 1658 - - - - - - - -
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. 273-4626
Mfr. Part No.8340-F410-P1M1-A3H0-8A
BrandETA
€44.36
Each
units
8A 1 - 80V dc 50.8mm 8340 - - - - - - - -
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. 881-1075
Mfr. Part No.CLB-103-11A3N-B-A
€2.854
Each (In a Pack of 10)
units
10A 1 - - - CLB Audio Visual Equipment, Household Appliances, Marine Applications, Medical Equipment, Power Strips, Power Supplies, Transportation Time Delayed 2500 A @ 32 V dc - - 10mm 10 x 11.2mm 11.2mm
RS Stock No. 286-4165
Mfr. Part No.3120-F521-H7T1-W01D-20A
BrandETA
€36.55
Each
units
20A 2 - - 25mm 3120 - - - - - - - -
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