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. 881-0909
Mfr. Part No.CA2-B0-26-460-422-D
€119.78
Each (In a Pack of 2)
units
6A 2 - - - C General Purpose Long 10000 A @ 277 V ac, 5000 A @ 125/250 V dc MCCB - 38.6mm 38.61 x 52.37mm 52.4mm
RS Stock No. 881-1328
Mfr. Part No.EA3-B0-24-810-22A-DC
€141.62
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. 336-012
Mfr. Part No.106-P30-000040-1A
BrandETA
€9.63
Each
units
1A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 881-1344
Mfr. Part No.EA4-X0-03-204-52E-GB
€271.80
Each
units
100A 4 - - - E Generators, Ideal for Higher Current and Voltage Applications, Industrial Appliances, Military, Renewable Energy Systems - 5000 A @ 125 V dc, 5000 A @ 240 Vac MCCB - 106.3mm 106.3 x 69.85mm 69.9mm
RS Stock No. 312-3831
Mfr. Part No.GB2DB12
€35.52
Each
units
6A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 1.5 (ac) kA - - - - -
RS Stock No. 284-6016
Mfr. Part No.4400.0034
BrandSchurter
€9.66
Each
units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 729-2786
Mfr. Part No.3120-F554-P7T1-W02D-20A
BrandETA
€27.48
Each
units
20A 2 - - 25mm 3120-F - - - - - - - -
RS Stock No. 881-5100
Mfr. Part No.MU1-B-34-615-1-A21-B-D
€14.70
Each
units
15A 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. 801-6892
Mfr. Part No.0712194
€18.21
Each
units
1A 1 - 65 V dc, 250 V ac 8.2mm TCP 1A - - - - - - - -
RS Stock No. 899-2922
Mfr. Part No.2BU10R
BrandAltech
€26.47
Each
units
10A 2 - 480Y/277V - R Appliance Circuit, Appliances, Business Equipment, Control Circuits and Some Electronic Applications, Lighting, Power Supplies, Sensitive Electronics, UL1077 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS Stock No. 728-8642
Mfr. Part No.106-P10-000040-6A
BrandETA
€15.15
Each
units
6A 1 - - 15.7mm 106 - - - - - - - -
RS Stock No. 282-8721
Mfr. Part No.2210-T210-K0M1-H121-0.5A
BrandETA
€46.05
Each
units
500mA 1 - - 12.5mm 2210 - - - - - - - -
RS Stock No. 881-5106
Mfr. Part No.MU1-B-34-610-1-A21-B-D
€16.06
Each (In a Pack of 13)
units
10A 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. 610-0904
Mfr. Part No.GB2CD14
€26.66
Each
units
8A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 1.5 (ac) kA - - - - -
RS Stock No. 323-9021
Mfr. Part No.GB2CD09
€28.79
Each
units
4A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 3 (ac) kA - - - - -
RS Stock No. 712-7663
Mfr. Part No.3120-F551-H7T1-W19DG4-10A
BrandETA
€24.30
Each
units
10A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 312-3730
Mfr. Part No.GB2CB21
€19.35
Each
units
16A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1.5 kA - - - - -
RS Stock No. 729-2824
Mfr. Part No.3140-F230-P7T1-SGRX-2.5A
BrandETA
€58.69
Each
units
2.5A 3 - - 54.5mm 3140 - - - - - - - -
RS Stock No. 782-7981
Mfr. Part No.W58-XC4C12A-20
€6.54
Each
units
7 A, 20 A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 899-3433
Mfr. Part No.2D16UM
BrandAltech
€41.51
Each
units
16A 2 - - - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformers, UL508 Application Time Delay 10 kA MCCB - - - -
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