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. 774-0106
Mfr. Part No.FC67209
$4.41
Each
units
3A 2 - 250V ac 6mm AN - - - - - - - -
RS Stock No. 175-0373
Mfr. Part No.REX12-TA2-107-DC24V-6A/6A
BrandETA
$90.13
Each
units
6A - - 24V dc 98.5mm REX12-T - - - - - - - -
RS Stock No. 175-1453
Mfr. Part No.GV4LE02S6
$729.39
Each
units
2A 3 TeSys 690V ac 116mm GV4LE - - 10 kA @ 660 → 690 V ac - - - - -
RS Stock No. 284-5990
Mfr. Part No.4400.003
BrandSchurter
$16.04
Each
units
10A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 175-0363
Mfr. Part No.REX12-TA1-107-DC24V-1A
BrandETA
$62.88
Each
units
1A - - 24V dc 98.5mm REX12-T - - - - - - - -
RS Stock No. 175-1555
Mfr. Part No.GV4PE80S6
$1,412.61
Each
units
80A 3 TeSys 690V ac 116mm GV4PE - - 10 kA @ 660 → 690 V ac - - - - -
RS Stock No. 881-8262
Mfr. Part No.1689336
$5.945
Each (In a Box of 10)
units
- - - - - VS-PSC 1.5/3-M PE - - - - - - - -
RS Stock No. 175-1564
Mfr. Part No.GV4PEM07N
$823.39
Each
units
7A 3 TeSys 690V ac 116mm GV4PEM - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1480
Mfr. Part No.GV4LE50N
$562.61
Each
units
50A 3 TeSys 690V ac 116mm GV4LE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1511
Mfr. Part No.GV4P80B
$1,438.17
Each
units
80A 3 TeSys 690V ac 165mm GV4P - - 10 kA @ 500 V ac - - - - -
RS Stock No. 712-7663
Mfr. Part No.3120-F551-H7T1-W19DG4-10A
BrandETA
$51.52
Each
units
10A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 284-6038
Mfr. Part No.4410.0039
BrandSchurter
$32.95
Each
units
600mA 1 - 240V ac - T12 - - - - - - - -
RS Stock No. 173-8072
Mfr. Part No.4404.0096
BrandSchurter
$4.376
Each (In a Box of 100)
units
3A 1 - 48 V dc, 240 V ac 19mm T9 - - - - - - - -
RS Stock No. 782-7821
Mfr. Part No.W57-XB1A7A10-5
$6.86
Each
units
5A 1 - 250V ac 0.575in W57 - - - - - - - -
RS Stock No. 801-6983
Mfr. Part No.0914099
$145.88
Each
units
2A 1 - 65 V dc, 250 V ac 12.5mm TMC 1 - - - - - - - -
RS Stock No. 333-265
Mfr. Part No.201-5A
BrandETA
$78.04
Each
units
5A 1 - - 80mm 201 - - - - - - - -
New
RS Stock No. 201-6352
Mfr. Part No.2800875
$87.80
Each
units
8A 2 Trabtech 80V dc 24.6mm CB TM2 - - - - - - - -
RS Stock No. 286-3960
Mfr. Part No.3120-F551-H7T1-W02D-1A
BrandETA
$39.06
Each
units
1A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 882-2322
Mfr. Part No.0915852
$683.42
1 Box of 6
Box(es)
- - - - - - - - - - - - - -
RS Stock No. 175-0383
Mfr. Part No.3120-F521-P7T1-W01D-6A-A04010611M
BrandETA
$81.38
Each
units
6A 2 - 50 V dc, 240 V ac 25mm 3120 - - 1000 A @ 50 V dc, 5000 A @ 250 V ac - - 44.5mm 44.5 x 22mm 22mm
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