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. 323-8999
Mfr. Part No.GB2CD06
HK$433.94
Each
units
1A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
RS Stock No. 312-3774
Mfr. Part No.GB2DB06
HK$295.00
Each
units
1A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
RS Stock No. 312-3780
Mfr. Part No.GB2DB07
HK$356.66
Each
units
2A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 15 (ac) kA - - - - -
RS Stock No. 312-3768
Mfr. Part No.GB2DB05
HK$295.00
Each
units
500mA 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
RS Stock No. 272-814
Mfr. Part No.GV3L25
HK$978.50
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -
RS Stock No. 323-9009
Mfr. Part No.GB2CD07
HK$295.00
Each
units
2A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 15 (ac) kA - - - - -
RS Stock No. 272-909
Mfr. Part No.GV3P25
HK$1,092.50
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -
RS Stock No. 608-8769
Mfr. Part No.GV3ME80
HK$2,509.88
Each
units
- 3 TeSys 690V ac 61mm GV3M - - 100 kA - - - - -
RS Stock No. 272-937
Mfr. Part No.GV3P65
HK$1,361.25
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 272-858
Mfr. Part No.GV3L65
HK$1,704.53
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 175-1583
Mfr. Part No.GV4PEM25S6
HK$5,066.87
Each
units
25A 3 TeSys 690V ac 116mm GV4PEM - - 10 kA @ 660 → 690 V ac - - - - -
RS Stock No. 312-3651
Mfr. Part No.GB2CB08
HK$191.75
Each
units
3A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 10 (ac) kA - - - - -
RS Stock No. 175-1584
Mfr. Part No.GV4PEM50B
HK$3,704.04
Each
units
50A 3 TeSys 690V ac 116mm GV4PEM - - 10 kA @ 500 V ac - - - - -
New
RS Stock No. 188-4740
Mfr. Part No.GV3P80
HK$3,427.88
Each
units
80A 3 TeSys 690V ac 136mm GV3P - - 6 kA @ 690 V ac - - - - -
RS Stock No. 175-1593
Mfr. Part No.GV4PEM80N6
HK$4,552.68
Each
units
80A 3 TeSys 690V ac 116mm GV4PEM - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 312-3667
Mfr. Part No.GB2CB09
HK$147.50
Each
units
4A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 6 (ac) kA - - - - -
RS Stock No. 175-1505
Mfr. Part No.GV4P25N
HK$3,839.10
Each
units
25A 3 TeSys 690V ac 165mm GV4P - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1473
Mfr. Part No.GV4LE25B6
HK$2,266.38
Each
units
25A 3 TeSys 690V ac 116mm GV4LE - - 10 kA @ 500 V ac - - - - -
RS Stock No. 312-3831
Mfr. Part No.GB2DB12
HK$248.00
Each
units
6A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 1.5 (ac) kA - - - - -
RS Stock No. 175-1440
Mfr. Part No.GV4L25N6
HK$3,013.88
Each
units
25A 3 TeSys 690V ac 165mm GV4L - - 8 kA @ 660 → 690 V ac - - - - -