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. 312-3667
Mfr. Part No.GB2CB09
TWD789.00
Each
units
4A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 6 (ac) kA - - - - -
RS Stock No. 312-3651
Mfr. Part No.GB2CB08
TWD639.00
Each
units
3A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 10 (ac) kA - - - - -
RS Stock No. 272-937
Mfr. Part No.GV3P65
TWD7,959.00
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 830-3060
Mfr. Part No.GV3P32
TWD6,385.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 323-9021
Mfr. Part No.GB2CD09
TWD1,378.00
Each
units
4A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 3 (ac) kA - - - - -
RS Stock No. 175-1514
Mfr. Part No.GV4P80N6
TWD15,244.00
Each
units
80A 3 TeSys 690V ac 165mm GV4P - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 272-886
Mfr. Part No.GV3P13
TWD4,587.00
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -
RS Stock No. 175-1559
Mfr. Part No.GV4PEM02S6
TWD19,830.00
Each
units
2A 3 TeSys 690V ac 116mm GV4PEM - - 10 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1538
Mfr. Part No.GV4PE25B
TWD11,520.00
Each
units
25A 3 TeSys 690V ac 116mm GV4PE - - 10 kA @ 500 V ac - - - - -
RS Stock No. 175-1515
Mfr. Part No.GV4P80S
TWD19,245.00
Each
units
80A 3 TeSys 690V ac 165mm GV4P - - 10 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1486
Mfr. Part No.GV4LE80N
TWD12,740.00
Each
units
80A 3 TeSys 690V ac 116mm GV4LE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1445
Mfr. Part No.GV4L80B
TWD12,332.00
Each
units
80A 3 TeSys 690V ac 165mm GV4L - - 10 kA @ 500 V ac - - - - -
RS Stock No. 175-1560
Mfr. Part No.GV4PEM03N
TWD20,180.00
Each
units
3.5A 3 TeSys 690V ac 116mm GV4PEM - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1502
Mfr. Part No.GV4P12N6
TWD14,210.00
Each
units
12.5A 3 TeSys 690V ac 165mm GV4P - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1539
Mfr. Part No.GV4PE25B6
TWD11,377.00
Each
units
25A 3 TeSys 690V ac 116mm GV4PE - - 10 kA @ 500 V ac - - - - -
RS Stock No. 175-1563
Mfr. Part No.GV4PEM03S6
TWD19,830.00
Each
units
3.5A 3 TeSys 690V ac 116mm GV4PEM - - 10 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1487
Mfr. Part No.GV4LE80N6
TWD11,917.00
Each
units
80A 3 TeSys 690V ac 116mm GV4LE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 188-4745
Mfr. Part No.GV3P731
TWD11,107.00
Each
units
73A 3 TeSys 690V ac 136mm GV3P - - 6 kA @ 690 V ac - - - - -
RS Stock No. 312-3875
Mfr. Part No.GB2DB21
TWD1,979.00
Each
units
16A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1.5 kA - - - - -
RS Stock No. 272-892
Mfr. Part No.GV3P18
TWD5,036.00
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -