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. 782-0918
Mfr. Part No.W58-XB1A4A-30
SGD7.92
Each
units
30A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 405-9157
Mfr. Part No.2-5700-IG1-P10-DD-000040-15A
BrandETA
SGD24.15
Each
units
15A 1 - - 29mm 2-5700 - - - - - - - -
RS Stock No. 881-1025
Mfr. Part No.CA3-B0-34-630-121-C
SGD108.59
Each
units
30A 3 - - - C General Purpose Medium 5000 A @ 125/250 V dc, 10000 A @ 277 V ac MCCB - 57.9mm 57.91 x 52.37mm 52.4mm
RS Stock No. 458-8683
Mfr. Part No.1180-01-2A
BrandETA
SGD21.72
Each
units
2A 1 - - 24.4mm 1180 - - - - - - - -
RS Stock No. 405-9135
Mfr. Part No.2-5700-IG1-P10-DD-000040-7A
BrandETA
SGD19.85
Each
units
7A 1 - - 29mm 2-5700 - - - - - - - -
RS Stock No. 458-8712
Mfr. Part No.1180-01-4A
BrandETA
SGD21.72
Each
units
4A 1 - - 24.4mm 1180 - - - - - - - -
RS Stock No. 782-7969
Mfr. Part No.W54-XB1A4A10-10
SGD4.16
Each
units
10A 1 - 250V ac 0.575in W54 - - - - - - - -
RS Stock No. 608-8769
Mfr. Part No.GV3ME80
SGD479.33
Each
units
- 3 TeSys 690V ac 61mm GV3M - - 100 kA - - - - -
RS Stock No. 272-937
Mfr. Part No.GV3P65
SGD329.15
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 272-921
Mfr. Part No.GV3P40
SGD299.10
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 898-4751
Mfr. Part No.1CR1L
BrandAltech
SGD35.40
Each
units
1A 1 - 240V ac - L Control Circuit, Lighting, Low Inrush Motors, Receptacles, Resistive Loads, Wiring Protection Time Delayed 10 kA Miniature Molded Case - - - -
RS Stock No. 312-3623
Mfr. Part No.GB2CB05
SGD34.26
Each
units
500mA 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
RS Stock No. 312-3673
Mfr. Part No.GB2CB10
SGD28.22
Each
units
5A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 2 (ac) kA - - - - -
RS Stock No. 729-2764
Mfr. Part No.2-5700-IG2-P10-DD-16A
BrandETA
SGD35.43
Each
units
16A 1 - - - 2 5700 - - - - - - - -
RS Stock No. 458-8728
Mfr. Part No.1180-01-6A
BrandETA
SGD21.72
Each
units
6A 1 - - 24.4mm 1180 - - - - - - - -
RS Stock No. 272-943
Mfr. Part No.GV3P50
SGD326.24
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 782-7956
Mfr. Part No.W28-XQ1A-0.50
SGD8.42
Each
units
500mA 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS Stock No. 405-9286
Mfr. Part No.8340-F410-P1M1-A3H0-50A
BrandETA
SGD47.11
Each
units
50A 1 - 80V dc 50.8mm 8340 - - - - - - - -
RS Stock No. 898-4767
Mfr. Part No.1CR5L
BrandAltech
SGD35.40
Each
units
5A 1 - 240V ac - L Control Circuit, Lighting, Low Inrush Motors, Receptacles, Resistive Loads, Wiring Protection Time Delayed 10 kA Miniature Molded Case - - - -
RS Stock No. 323-9009
Mfr. Part No.GB2CD07
SGD57.87
Each
units
2A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 15 (ac) kA - - - - -
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