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. 830-3060
Mfr. Part No.GV3P32
€439.34
Each
units
- - - - - - - - - - - - - -
RS Stock No. 868-8803
Mfr. Part No.4400.0290
BrandSchurter
€7.25
Each
units
4A 1 - - - - - - - MCB - - - -
RS Stock No. 150-085
Mfr. Part No.1610-21-30A
BrandETA
€14.34
Each
units
30A 1 - 32V dc 20mm 1610 - - - - - - - -
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. 782-7966
Mfr. Part No.W58-XC4C12A-15
€8.19
Each
units
15A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
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. 881-1081
Mfr. Part No.CLB-203-11B5N-W-A/20
€6.272
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. 899-1591
Mfr. Part No.2DU10R
BrandAltech
€20.47
Each
units
10A 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. 729-2773
Mfr. Part No.2-5700-IG2-P10-DD-000040-20A
BrandETA
€23.41
Each
units
20A 1 - - 15.7mm 2 5700 - - - - - - - -
RS Stock No. 272-937
Mfr. Part No.GV3P65
€154.95
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 782-6571
Mfr. Part No.W28-XQ1A-16
€3.42
Each
units
16A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS Stock No. 881-1091
Mfr. Part No.CLB-603-12C3N-B-F/60
€18.998
Each (In a Pack of 50)
units
60A 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. 782-8000
Mfr. Part No.W58-XC4C12A-2
€10.99
Each
units
2A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
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. 885-6261
Mfr. Part No.3000763
€452.21
1 Box of 6
Box(es)
- - - - - - - - - - - - - -
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. 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. 801-6902
Mfr. Part No.0712217
€18.21
Each
units
2A 1 - 65 V dc, 250 V ac 8.2mm TCP 2A - - - - - - - -
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. 801-6892
Mfr. Part No.0712194
€18.21
Each
units
1A 1 - 65 V dc, 250 V ac 8.2mm TCP 1A - - - - - - - -
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