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. 868-8853
Mfr. Part No.4404.0028
BrandSchurter
MYR8.227
Each (In a Pack of 100)
units
15A 1 - - - T9-311 Household Appliances, HVAC, Industrial Appliances, Medical, Power Supplies, Power Tools, Uninterruptible Power Supply - 2 kA MCB 9.6mm 8.9mm 8.9 x 9.6 (Dia.)mm -
RS Stock No. 881-4740
Mfr. Part No.AC1-B0-34-630-1G1-C
MYR75.29
Each
units
30A 1 - - - A Generators, Marine Applications, Military, Renewable Energy Systems, Telecommunications, Welder Medium 5000 A @ 80 V dc - - 19.1mm 19.05 x 42.16mm 42.2mm
RS Stock No. 801-6918
Mfr. Part No.0712275
MYR71.98
Each
units
6A 1 - 65 V dc, 250 V ac 8.2mm TCP 6A - - - - - - - -
RS Stock No. 272-892
Mfr. Part No.GV3P18
MYR1,580.20
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -
RS Stock No. 122-9280
Mfr. Part No.3400-P10-H-SI-2A
BrandETA
MYR251.50
Each
units
2A 1 - - 42mm 3400 - - - - - - - -
RS Stock No. 409-873
Mfr. Part No.1610-21-8A
BrandETA
MYR30.47
Each
units
8A 1 - 32V dc 20mm 1610 - - - - - - - -
RS Stock No. 899-1667
Mfr. Part No.2DU30R
BrandAltech
MYR87.67
Each
units
30A 2 - 480Y/277V - R Appliance Circuit, Control Transformers, Power Supplies, Power Supplies and Reactive Loads, Sensitive Electronics, UL1077 Application Time Delay 10 kA MCCB - - - -
RS Stock No. 739-6878
Mfr. Part No.3120-F521-H7T1-W01D-5A-U0000M
BrandETA
MYR186.51
Each
units
5A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 898-1761
Mfr. Part No.1E1.6UM
BrandAltech
MYR72.47
Each
units
1.6A 1 - 42V dc - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, High Efficiency Motors, UL508 Application, Which have Exceedingly High Inrush Current Time Delay 10 kA MCCB - - - -
RS Stock No. 881-1319
Mfr. Part No.EA2-B0-26-680-32E-HB
MYR227.79
Each
units
80A 2 - - - E Generators, Ideal for Higher Current and Voltage Applications, Industrial Appliances, Military, Renewable Energy Systems Long 5000 A @ 125 V dc, 5000 A @ 240 Vac MCCB - 53.2mm 53.15 x 69.85mm 69.9mm
RS Stock No. 868-8885
Mfr. Part No.4404.0039
BrandSchurter
MYR2.833
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. 286-4222
Mfr. Part No.3120-F32F-H7T1-SGRX-15A
BrandETA
MYR146.02
Each
units
15A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 899-1705
Mfr. Part No.2DU60L
BrandAltech
MYR189.96
Each
units
60A 2 - 240V ac - L Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformer, UL489 Applications Time Delay 10 kA MCCB - - - -
RS Stock No. 284-6000
Mfr. Part No.4400.0031
BrandSchurter
MYR40.74
Each
units
12A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 782-8000
Mfr. Part No.W58-XC4C12A-2
MYR35.89
Each
units
2A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 881-4728
Mfr. Part No.AC1-A0-03-630-131-C
MYR62.17
Each
units
30A 1 - - - A Generators, Marine Applications, Military, Renewable Energy Systems, Telecommunications, Welder - 5000 A @ 80 V dc - - 19.1mm 19.05 x 42.16mm 42.2mm
RS Stock No. 405-9135
Mfr. Part No.2-5700-IG1-P10-DD-000040-7A
BrandETA
MYR66.70
Each
units
7A 1 - - 29mm 2-5700 - - - - - - - -
RS Stock No. 405-9214
Mfr. Part No.4130-G211-K4M1-35A
BrandETA
MYR113.17
Each
units
35A 1 - - 32mm 4130 - - - - - - - -
RS Stock No. 881-1123
Mfr. Part No.CM2-B0-34-610-201-C
MYR559.965
Each (In a Pack of 2)
units
10A 2 - - - C General Purpose Medium 10000 A @ 277 V ac, 5000 A @ 125/250 V dc MCCB 13.1mm - 13.09 (Dia.)mm -
RS Stock No. 879-8682
Mfr. Part No.AA2-B0-26-630-1B1-C
MYR154.14
Each
units
30A 2 - - - A Generators, Marine Applications, Military, Renewable Energy Systems, Telecommunications, Welder Long 5000 A @ 80 V dc - 16mm - - -
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