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. 272-921
Mfr. Part No.GV3P40
MYR1,103.80
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 272-937
Mfr. Part No.GV3P65
MYR1,055.15
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 272-943
Mfr. Part No.GV3P50
MYR1,071.91
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 312-3881
Mfr. Part No.GB2DB22
MYR313.34
Each
units
20A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1.5 kA - - - - -
RS Stock No. 272-909
Mfr. Part No.GV3P25
MYR911.52
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -
RS Stock No. 610-0910
Mfr. Part No.GB2CD16
MYR214.81
Each
units
10A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 1.5 (ac) kA - - - - -
RS Stock No. 312-3645
Mfr. Part No.GB2CB07
MYR126.83
Each
units
2A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 15 (ac) kA - - - - -
RS Stock No. 323-9009
Mfr. Part No.GB2CD07
MYR216.56
Each
units
2A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 15 (ac) kA - - - - -
RS Stock No. 312-3803
Mfr. Part No.GB2DB09
MYR287.54
Each
units
4A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 3 (ac) kA - - - - -
RS Stock No. 830-3060
Mfr. Part No.GV3P32
MYR995.87
Each
units
- - - - - - - - - - - - - -
RS Stock No. 272-842
Mfr. Part No.GV3L50
MYR1,171.20
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 312-3651
Mfr. Part No.GB2CB08
MYR96.94
Each
units
3A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 10 (ac) kA - - - - -
RS Stock No. 312-3853
Mfr. Part No.GB2DB16
MYR291.97
Each
units
10A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1.5 kA - - - - -
RS Stock No. 312-3746
Mfr. Part No.GB2CB22
MYR120.97
Each
units
20A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1.5 kA - - - - -
RS Stock No. 272-892
Mfr. Part No.GV3P18
MYR811.83
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -
RS Stock No. 323-9043
Mfr. Part No.GB2CD12
MYR217.41
Each
units
6A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 1.5 (ac) kA - - - - -
RS Stock No. 312-3875
Mfr. Part No.GB2DB21
MYR320.46
Each
units
16A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1.5 kA - - - - -
RS Stock No. 312-3639
Mfr. Part No.GB2CB06
MYR96.94
Each
units
1A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
RS Stock No. 312-3780
Mfr. Part No.GB2DB07
MYR255.00
Each
units
2A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 15 (ac) kA - - - - -
RS Stock No. 175-1533
Mfr. Part No.GV4PE115S6
MYR3,034.99
Each
units
115A 3 TeSys 690V ac 116mm GV4PE - - 10 kA @ 660 → 690 V ac - - - - -