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. 170-9405
Mfr. Part No.W28-XQ1A-10
£1.97
Each (In a Bag of 100)
Units
10A 1 - 32 V dc, 250 V ac - W28 - - 1000 A - - - - -
RS Stock No. 284-5906
Mfr. Part No.4400.0017
BrandSchurter
£4.90
Each
Units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 173-9833
Mfr. Part No.4400.0017
BrandSchurter
£4.456
Each (In a Box of 100)
Units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 782-0911
Mfr. Part No.W28-XQ1A-3
£1.89
Each
Units
3A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS Stock No. 333-237
Mfr. Part No.201-1A
BrandETA
£36.36
Each
Units
1A 1 - - 80mm 201 - - - - - - - -
RS Stock No. 417-010
Mfr. Part No.1110-F112-P1M1-10A
BrandETA
£13.88
Each
Units
10A 1 - - 19mm 1110 - - - - - - - -
RS Stock No. 782-0892
Mfr. Part No.W58-XB1A4A-10
£3.37
Each
Units
10A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 323-8983
Mfr. Part No.GB2CD05
£30.63
Each
Units
500mA 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
RS Stock No. 416-972
Mfr. Part No.1110-F112-P1M1-3A
BrandETA
£14.46
Each
Units
3A 1 - - 19mm 1110 - - - - - - - -
RS Stock No. 881-1132
Mfr. Part No.CMB-033-11C3N-B-A
£2.83
Each
Units
3A 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. 282-8765
Mfr. Part No.2210-T210-K0M1-H121-10A
BrandETA
£30.26
Each
Units
10A 1 - - 83.5mm 2210 - - - - - - - -
RS Stock No. 286-4222
Mfr. Part No.3120-F32F-H7T1-SGRX-15A
BrandETA
£21.69
Each
Units
15A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 122-9296
Mfr. Part No.3400-P10-H-SI-5A
BrandETA
£45.34
Each
Units
5A 1 - - 42mm 3400 - - - - - - - -
RS Stock No. 312-3673
Mfr. Part No.GB2CB10
£17.55
Each
Units
5A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 2 (ac) kA - - - - -
RS Stock No. 405-9242
Mfr. Part No.4130-G211-K4M1-50A
BrandETA
£21.80
Each
Units
50A 1 - - 32mm 4130 - - - - - - - -
RS Stock No. 729-2833
Mfr. Part No.3600-P10-Si-1A
BrandETA
£54.06
Each
Units
1A 1 - - 11.5mm 3600 - - - - - - - -
RS Stock No. 272-892
Mfr. Part No.GV3P18
£112.00
Each
Units
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -
RS Stock No. 282-8743
Mfr. Part No.2210-T210-K0M1-H121-1A
BrandETA
£30.26
Each
Units
1A 1 - - 83.5mm 2210 - - - - - - - -
RS Stock No. 782-0915
Mfr. Part No.W58-XB1A4A-5
£4.19
Each
Units
5A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 782-7969
Mfr. Part No.W54-XB1A4A10-10
£2.78
Each
Units
10A 1 - 250V ac 0.575in W54 - - - - - - - -
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