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. 881-1081
Mfr. Part No.CLB-203-11B5N-W-A/20
R 106.535
Each (In a Pack of 50)
units
20A 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. 881-1088
Mfr. Part No.CLB-203-11A3N-B-A
R 58.359
Each (In a Pack of 10)
units
20A 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. 782-7855
Mfr. Part No.W68-X2Q12-15
R 913.83
Each
units
15A 2 - 277V ac 1.5in W68 - - - - - - - -
RS stock no. 272-842
Mfr. Part No.GV3L50
R 7,090.93
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS stock no. 333-287
Mfr. Part No.201-15A
BrandETA
R 836.99
Each
units
15A 1 - - 80mm 201 - - - - - - - -
RS stock no. 405-9214
Mfr. Part No.4130-G211-K4M1-35A
BrandETA
R 638.85
Each
units
35A 1 - - 18mm 4130 - - - - - - - -
RS stock no. 409-867
Mfr. Part No.1610-21-6A
BrandETA
R 249.62
Each
units
6A 1 - 32V dc 20mm 1610 - - - - - - - -
RS stock no. 782-7821
Mfr. Part No.W57-XB1A7A10-5
R 77.61
Each
units
5A 1 - 250V ac 0.575in W57 - - - - - - - -
RS stock no. 282-6545
Mfr. Part No.2210-T210-K0M1-H121-5A
BrandETA
R 767.06
Each
units
5A 1 - - 12.5mm 2210 - - - - - - - -
RS stock no. 870-1048
Mfr. Part No.TS-701-HT-8
BrandSchurter
R 47.977
Each (In a Pack of 100)
units
8A 1 - 50 V dc, 250 V ac - TS-701 - - 1000 A MCB 9.7mm 8.9mm 8.9 x 9.7 (Dia.)mm -
RS stock no. 782-7931
Mfr. Part No.W57-XB7A4A10-15
R 56.26
Each
units
15A 1 - 250V ac 0.575in W57 - - - - - - - -
RS stock no. 782-6565
Mfr. Part No.W28-XT1A-15
R 80.57
Each
units
15A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS stock no. 728-8610
Mfr. Part No.104-PR-4A
BrandETA
R 212.74
Each
units
4A 1 - - 11mm 104-PR - - - - - - - -
RS stock no. 849-5939
Mfr. Part No.CB187F-150
R 2,202.00
Each
units
150A 1 - 48V dc - CB187F - - - - - - - -
RS stock no. 782-6597
Mfr. Part No.W28-XQ1A-4
R 76.01
Each
units
4A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS stock no. 782-6569
Mfr. Part No.W33-T4B1Q-10
R 653.82
Each
units
10A 2 - 120V 21.59mm W33 - - - - - - - -
RS stock no. 881-8272
Mfr. Part No.1689569
R 32,106.12
1 Box of 10000
Box(es)
- - - - - VS-BU-CD-1.0/14.4/0.5-R - - - - - - - -
RS stock no. 284-6123
Mfr. Part No.4410.0152
BrandSchurter
R 398.99
Each
units
16A 1 - 240V ac - T12 - - - - - - - -
RS stock no. 729-2818
Mfr. Part No.3130-F130-P7T1-W02Q-10A
BrandETA
R 578.66
Each
units
10A 3 - - 41mm 3130 - - - - - - - -
RS stock no. 782-7972
Mfr. Part No.W58-XB1A4A-1
R 204.28
Each
units
1A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -