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 Breaking Capacity at Maximum Voltage Rating Circuit Breaker Type Mounting Hole Diameter Mounting Hole Length Mounting Hole Size Mounting Hole Width Mounting Style
RS Stock No. 175-0394
Mfr. Part No.3130-FA2A-P7T1-W01Q-15A-A040001M
BrandETA
$67.18
Each
units
15A 2 - 50 V dc, 240 V ac 36.5mm 3130 - 2000 A @ 50 V dc, 3500 A @ 250 V ac - - 36mm 36 x 29.5mm 29.5mm Snap In
RS Stock No. 175-1550
Mfr. Part No.GV4PE80B
$532.13
Each
units
80A 3 TeSys 690V ac 116mm GV4PE - 10 kA @ 500 V ac - - - - - -
RS Stock No. 885-6258
Mfr. Part No.3000761
$909.05
1 Box of 10
Box(es)
- - - - - - - - - - - - - -
RS Stock No. 774-0137
Mfr. Part No.FC67216
$6.01
Each
units
10A 2 - 250V ac 6mm AN - - - - - - - -
RS Stock No. 175-1498
Mfr. Part No.GV4P115N
$1,480.91
Each
units
115A 3 TeSys 690V ac 165mm GV4P - 8 kA @ 660 → 690 V ac - - - - - -
RS Stock No. 830-3060
Mfr. Part No.GV3P32
$523.43
Each
units
32A - - 690V ac 55mm GV3 - - - - - - - -
RS Stock No. 175-1452
Mfr. Part No.GV4LE02S
$659.91
Each
units
2A 3 TeSys 690V ac 116mm GV4LE - 10 kA @ 660 → 690 V ac - - - - - -
New
RS Stock No. 210-2112
Mfr. Part No.3120-N554-P7T1-W19DG4-12A
BrandETA
$50.74
Each
units
12A 5 - 50 V DC, 240 V AC 28mm 3120-N - - - - - - - -
New
RS Stock No. 210-2107
Mfr. Part No.3120-N554-P7T1-W02D-16A
BrandETA
$45.12
Each
units
16A 5 - 50 V DC, 240 V AC 28mm 3120-N - - - - - - - -
RS Stock No. 175-1574
Mfr. Part No.GV4PEM12N
$786.94
Each
units
12.5A 3 TeSys 690V ac 116mm GV4PEM - 8 kA @ 660 → 690 V ac - - - - - -
RS Stock No. 774-0118
Mfr. Part No.FC67211
$4.29
Each
units
5A 2 - 250V ac 6mm AN - - - - - - - -
RS Stock No. 175-1532
Mfr. Part No.GV4PE115S
$1,060.05
Each
units
115A 3 TeSys 690V ac 116mm GV4PE - 10 kA @ 660 → 690 V ac - - - - - -
New
RS Stock No. 210-2069
Mfr. Part No.3120-N521-H7T1-W01D-1A
BrandETA
$67.75
Each
units
1A 2 - 50 V DC, 240 V AC 25mm 3120-N - - - - - - - -
New
RS Stock No. 210-2104
Mfr. Part No.3120-N551-H7T1-W19DG4-20A
BrandETA
$46.20
Each
units
20A 5 - 50 V DC, 240 V AC 25mm 3120-N - - - - - - - -
RS Stock No. 175-1581
Mfr. Part No.GV4PEM25N6
$1,659.96
Each
units
25A 3 TeSys 690V ac 116mm GV4PEM - 8 kA @ 660 → 690 V ac - - - - - -
RS Stock No. 175-1570
Mfr. Part No.GV4PEM115N
$979.81
Each
units
115A 3 TeSys 690V ac 116mm GV4PEM - 8 kA @ 660 → 690 V ac - - - - - -
RS Stock No. 175-1588
Mfr. Part No.GV4PEM50S
$1,043.98
Each
units
50A 3 TeSys 690V ac 116mm GV4PEM - 10 kA @ 660 → 690 V ac - - - - - -
RS Stock No. 175-1455
Mfr. Part No.GV4LE03N6
$800.87
Each
units
3.5A 3 TeSys 690V ac 116mm GV4LE - 8 kA @ 660 → 690 V ac - - - - - -
RS Stock No. 684-3601
Mfr. Part No.0916608
$20.58
Each
units
- - - - - - - - - - - - - -
RS Stock No. 209-5328
Mfr. Part No.GV4PB80N
$774.55
Each
units
80A 3 TeSys 690V ac 81mm GV4PB - - - - - - - -