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. 881-5106
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. 782-7931
Mfr. Part No.W57-XB7A4A10-15
€2.87
Each
units
15A 1 - 250V ac 0.575in W57 - - - - - - - -
RS Stock No. 899-3231
Mfr. Part No.2CU10R
BrandAltech
€26.47
Each
units
10A 2 - 480Y/277V - R Appliance Circuit, Appliances, Business Equipment, Control Circuit Application, Lighting, Power Supplies, Sensitive Electronics, UL1077 Application, Wiring Protection Time Delay 10 kA MCCB - - - -
RS Stock No. 899-1705
Mfr. Part No.2DU60L
BrandAltech
€44.36
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. 323-9043
Mfr. Part No.GB2CD12
€28.79
Each
units
6A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 1.5 (ac) kA - - - - -
RS Stock No. 335-980
Mfr. Part No.106-P30-000040-3A
BrandETA
€9.63
Each
units
3A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 282-6545
Mfr. Part No.2210-T210-K0M1-H121-5A
BrandETA
€44.47
Each
units
5A 1 - - 12.5mm 2210 - - - - - - - -
RS Stock No. 885-6261
Mfr. Part No.3000763
€452.21
1 Box of 6
Box(es)
- - - - - - - - - - - - - -
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. 881-4927
Mfr. Part No.C1005B-3B151BR3
€2.939
Each (In a Pack of 10)
units
15A - - - - C1005B Audio Visual Equipment, Commercial Applications, Generators, Household Appliances, Marine Applications, Medical Equipment, Power Strips, Power Supplies, Telecommunications, Transportation Time Delayed 1000 A - - 14mm 14 x 28.6mm 28.6mm
RS Stock No. 881-4920
Mfr. Part No.C1005B-3B101BR3
€2.014
Each (In a Pack of 10)
units
10A - - - - C1005B Audio Visual Equipment, Commercial Applications, Generators, Household Appliances, Marine Applications, Medical Equipment, Power Strips, Power Supplies, Telecommunications, Transportation Time Delayed 1000 A - - 14mm 14 x 28.6mm 28.6mm
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. 284-6016
Mfr. Part No.4400.0034
BrandSchurter
€9.66
Each
units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 173-9840
Mfr. Part No.4400.0025
BrandSchurter
€5.595
Each (In a Box of 100)
units
4A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 170-3786
Mfr. Part No.0712217
€16.558
Each (In a Box of 20)
units
2A 1 - 65 V dc, 250 V ac 8.2mm TCP 2A - - - - - - - -
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. 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. 284-5811
Mfr. Part No.4400.0047
BrandSchurter
€9.74
Each
units
2A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 170-3783
Mfr. Part No.0712194
€16.558
Each (In a Box of 20)
units
1A 1 - 65 V dc, 250 V ac 8.2mm TCP1A - - - - - - - -
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
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