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. 273-0882
Mfr. Part No.1658-G21-02-P10-15A
BrandETA
R 121.44
Each
units
15A 1 - - 14mm 1658 - - - - - - - -
RS stock no. 272-921
Mfr. Part No.GV3P40
R 4,258.79
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS stock no. 405-9141
Mfr. Part No.2-5700-IG1-P10-DD-000040-10A
BrandETA
R 372.91
Each
units
10A 1 - - 15.7mm 2-5700 - - - - - - - -
RS stock no. 344-5333
Mfr. Part No.1658-G21-02-P10-16A
BrandETA
R 136.17
Each
units
16A 1 - - 14mm 1658 - - - - - - - -
RS stock no. 405-9179
Mfr. Part No.2-5700-IG1-P10-DD-000040-20A
BrandETA
R 356.21
Each
units
20A 1 - - 15.7mm 2-5700 - - - - - - - -
RS stock no. 405-9157
Mfr. Part No.2-5700-IG1-P10-DD-000040-15A
BrandETA
R 372.91
Each
units
15A 1 - - 15.7mm 2-5700 - - - - - - - -
RS stock no. 273-0860
Mfr. Part No.1658-G21-02-P10-10A
BrandETA
R 121.44
Each
units
10A 1 - - 14mm 1658 - - - - - - - -
RS stock no. 405-9208
Mfr. Part No.4130-G211-K4M1-30A
BrandETA
R 623.95
Each
units
30A 1 - - 18mm 4130 - - - - - - - -
RS stock no. 712-7663
Mfr. Part No.3120-F551-H7T1-W19DG4-10A
BrandETA
R 440.65
Each
units
10A 2 - - 25mm 3120 - - - - - - - -
RS stock no. 782-8029
Mfr. Part No.W58-XB1A4A-3
R 202.46
Each
units
3A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS stock no. 286-4165
Mfr. Part No.3120-F521-H7T1-W01D-20A
BrandETA
R 646.87
Each
units
20A 2 - - 25mm 3120 - - - - - - - -
RS stock no. 286-4020
Mfr. Part No.3120-F551-H7T1-W02D-20A
BrandETA
R 391.71
Each
units
20A 2 - - 25mm 3120 - - - - - - - -
RS stock no. 272-937
Mfr. Part No.GV3P65
R 4,970.02
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS stock no. 728-8648
Mfr. Part No.106-P10-000040-3A
BrandETA
R 260.51
Each
units
3A 1 - - 15.7mm 106 - - - - - - - -
RS stock no. 272-943
Mfr. Part No.GV3P50
R 4,790.03
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS stock no. 830-3060
Mfr. Part No.GV3P32
R 3,364.48
Each
units
32A - - 690V ac 55mm GV3 - - - - - - - -
RS stock no. 170-9405
Mfr. Part No.W28-XQ1A-10
R 50.987
Each (In a Bag of 100)
units
10A 1 - 32 V dc, 250 V ac - W28 - - 1000 A - - - - -
RS stock no. 167-5677
Mfr. Part No.W28-XQ1A-10
R 59.27
Each
units
10A 1 - 32 V dc, 250 V ac - W28 - - 1000 A - - - - -
RS stock no. 405-9135
Mfr. Part No.2-5700-IG1-P10-DD-000040-7A
BrandETA
R 356.57
Each
units
7A 1 - - 15.7mm 2-5700 - - - - - - - -
RS stock no. 729-2786
Mfr. Part No.3120-F554-P7T1-W02D-20A
BrandETA
R 483.16
Each
units
20A 2 - - 25mm 3120-F - - - - - - - -