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. 286-4165
Mfr. Part No.3120-F551-H7T1-W02D-20A
BrandETA
$53.54
Each
units
20A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 729-2849
Mfr. Part No.3600-P10-Si-4A
BrandETA
$165.92
Each
units
4A 1 - - 11.5mm 3600 - - - - - - - -
RS Stock No. 782-7938
Mfr. Part No.W57-XB7A4A10-5
$3.15
Each
units
5A 1 - 250V ac 0.575in W57 - - - - - - - -
RS Stock No. 801-6915
Mfr. Part No.0712314
$22.26
Each
units
10A 1 - 65 V dc, 250 V ac 8.2mm TCP 10A - - - - - - - -
RS Stock No. 170-3790
Mfr. Part No.0712314
$21.318
Each (In a Box of 20)
units
10A 1 - 65 V dc, 250 V ac 8.2mm TCP 10A - - - - - - - -
RS Stock No. 286-4020
Mfr. Part No.3120-F551-H7T1-W02D-20A
BrandETA
$53.52
Each
units
20A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 782-6565
Mfr. Part No.W28-XT1A-15
$4.61
Each
units
15A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS Stock No. 782-7962
Mfr. Part No.W58-XB1A4A-12
$8.02
Each
units
12A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 150-085
Mfr. Part No.1610-21-30A
BrandETA
$12.82
Each
units
30A 1 - 32V dc 20mm 1610 - - - - - - - -
RS Stock No. 405-9208
Mfr. Part No.4130-G211-K4M1-30A
BrandETA
$107.53
Each
units
30A 1 - - 32mm 4130 - - - - - - - -
RS Stock No. 782-0892
Mfr. Part No.W58-XB1A4A-10
$8.02
Each
units
10A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 782-7830
Mfr. Part No.W57-XB1A7A10-20
$4.04
Each
units
20A 1 - 250V ac 0.575in W57 - - - - - - - -
RS Stock No. 712-7657
Mfr. Part No.3120-F551-H7T1-W14DR4-20A
BrandETA
$46.65
Each
units
20A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 631-9120
Mfr. Part No.ESS20-00-3-DC24V-3A/6A
BrandETA
$134.24
Each
units
3 A, 3 → 6 A 6 - - - ESS20 - - - - - - - -
RS Stock No. 284-5798
Mfr. Part No.4400.0008
BrandSchurter
$15.13
Each
units
1A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 782-8044
Mfr. Part No.W51-A122B1-10
$5.72
Each
units
10A 1 - 250V ac 0.598in W51 - - - - - - - -
RS Stock No. 782-8035
Mfr. Part No.W54-XB1A4A10-5
$4.52
Each
units
5A 1 - 250V ac 0.575in W54 - - - - - - - -
RS Stock No. 284-5849
Mfr. Part No.4400.0001
BrandSchurter
$15.76
Each
units
4A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 782-0882
Mfr. Part No.W23-X1A1G-50
$28.33
Each
units
50A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS Stock No. 312-3673
Mfr. Part No.GB2CB10
$26.40
Each
units
5A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 2 (ac) kA - - - - -
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