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. 284-6202
Mfr. Part No.4411.0134
BrandSchurter
R 241.83
Each
units
15A 1 - 240V ac - T13 - - - - - - - -
RS stock no. 323-8999
Mfr. Part No.GB2CD06
R 451.67
Each
units
1A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
RS stock no. 868-8885
Mfr. Part No.4404.0039
BrandSchurter
R 13.624
Each (In a Pack of 50)
units
- 1 - - - T9-711 Household Appliances, HVAC, Industrial Appliances, Medical, Power Supplies, Power Tools, Uninterruptible Power Supply - 2 kA - - - - -
RS stock no. 881-1148
Mfr. Part No.CMB-123-11C3N-B-A
R 32.356
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. 881-5018
Mfr. Part No.MD2-B-24-630-1-A36-B-C
R 683.83
Each (In a Pack of 6)
units
30A 2 - - - M Automotive, Communication Equipment, Generators, Marine Applications, Medical Equipment, Power Supplies Medium 600 A @ 80 V dc MCB - 33.8mm 33.76 x 37.08mm 37.1mm
RS stock no. 870-1023
Mfr. Part No.TS-701-HT-35
BrandSchurter
R 48.578
Each (In a Pack of 100)
units
35A 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. 881-4939
Mfr. Part No.C22-P0-D4-820-31E-MT
R 3,120.325
Each (In a Pack of 2)
units
200A 2 - - - C General Purpose Medium 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - - - -
RS stock no. 336-012
Mfr. Part No.106-P30-000040-1A
BrandETA
R 178.45
Each
units
1A 1 - - 19mm 106-P30 - - - - - - - -
RS stock no. 782-0860
Mfr. Part No.W23-X1A1G-15
R 515.40
Each
units
15A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS stock no. 782-0870
Mfr. Part No.W23-X1A1G-35
R 566.06
Each
units
35A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS stock no. 881-1328
Mfr. Part No.EA3-B0-24-810-22A-DC
R 2,744.58
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. 868-8875
Mfr. Part No.4404.0034
BrandSchurter
R 39.146
Each (In a Pack of 100)
units
16A 1 - - - T9-711 Household Appliances, HVAC, Industrial Appliances, Medical, Power Supplies, Power Tools, Uninterruptible Power Supply - 2 kA MCB 15.9mm 13.9mm 13.9 x 15.9 (Dia.)mm -
RS stock no. 881-1079
Mfr. Part No.CLB-153-11A3N-B-A
R 46.991
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. 881-5112
Mfr. Part No.MU1-B-34-625-1-A21-B-C
R 263.15
Each
units
25A 1 - - - M Automotive, Communication Equipment, Generators, Marine Applications, Medical Equipment, Power Supplies Medium 600 A @ 80 V dc MCB 9.5mm - 9.53 (Dia.)mm -
RS stock no. 333-259
Mfr. Part No.201-3A
BrandETA
R 836.45
Each
units
3A 1 - - 80mm 201 - - - - - - - -
RS stock no. 782-8038
Mfr. Part No.W58-XB1A4A-6
R 150.13
Each
units
6A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS stock no. 729-2704
Mfr. Part No.1410-G111-P2F1-S01-1A
BrandETA
R 202.68
Each
units
1A 1 - - 15.7mm 1410-G1 - - - - - - - -
RS stock no. 868-8910
Mfr. Part No.4411.0010
BrandSchurter
R 270.813
Each (In a Pack of 20)
units
20A 1 - - - T13-211 Household Appliances, Power Supplies, Power Tools, Uninterruptible Power Supply - 1 kA MCB 9.6mm - 9.6 (Dia.)mm -
RS stock no. 881-1085
Mfr. Part No.CLB-253-11A3N-B-A
R 73.59
Each
units
25A 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. 782-0886
Mfr. Part No.W23-X1A1G-5
R 542.77
Each
units
5A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -