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. 312-3796
Mfr. Part No.GB2DB08
$91.91
Each
units
3A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 10 (ac) kA - - - - -
RS Stock No. 175-1487
Mfr. Part No.GV4LE80N6
$642.93
Each
units
80A 3 TeSys 690V ac 116mm GV4LE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 273-4610
Mfr. Part No.8340-F410-P1M1-A3H0-5A
BrandETA
$70.09
Each
units
5A 1 - 80V dc 50.8mm 8340 - - - - - - - -
RS Stock No. 801-6987
Mfr. Part No.0914125
$145.77
Each
units
4A 1 - 65 V dc, 250 V ac 12.5mm TMC 1 - - - - - - - -
RS Stock No. 284-6167
Mfr. Part No.4411.0132
BrandSchurter
$32.46
Each
units
5A 1 - 240V ac - T13 - - - - - - - -
RS Stock No. 712-7672
Mfr. Part No.3120-F551-H7T1-W19DG4-2.5A
BrandETA
$53.56
Each
units
2.5A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 212-1941
Mfr. Part No.3130-F120-P7T1-W02Q-3A
BrandETA
$105.64
Each
units
3A 2 - - 36mm 3130 - - - - - - - -
RS Stock No. 175-1524
Mfr. Part No.GV4PE07N
$743.49
Each
units
7A 3 TeSys 690V ac 116mm GV4PE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-0370
Mfr. Part No.REX12-TA2-107-DC24V-1A/1A
BrandETA
$68.92
Each
units
1A - - 24V dc 98.5mm REX12-T - - - - - - - -
RS Stock No. 212-2225
Mfr. Part No.3130-F110-P7T1-W19QY7-5A
BrandETA
$61.18
Each
units
5A 1 - - 36mm 3130 - - - - - - - -
RS Stock No. 175-1491
Mfr. Part No.GV4P02N6
$765.84
Each
units
2A 3 TeSys 690V ac 165mm GV4P - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 881-8193
Mfr. Part No.1688476
$14.54
1 Box of 5
Box(es)
- - - - - VS-09-TI-2EMV - - - - - - - -
RS Stock No. 868-9024
Mfr. Part No.4420.0675
BrandSchurter
$42.406
Each (In a Pack of 10)
units
15A 1 - - - AS168X - - - - - - - -
RS Stock No. 175-1587
Mfr. Part No.GV4PEM50N6
$914.11
Each
units
50A 3 TeSys 690V ac 116mm GV4PEM - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-0391
Mfr. Part No.3130-FA2A-P7T1-W01Q-8A-A040001M
BrandETA
$69.29
Each
units
8A 2 - 50 V dc, 240 V ac 26mm 3130 - - 2000 A @ 50 V dc, 3500 A @ 250 V ac - - 36mm 36 x 29.5mm 29.5mm
RS Stock No. 170-3785
Mfr. Part No.0712152
$27.251
Each (In a Box of 20)
units
500mA 1 - 65 V dc, 250 V ac 8.2mm TCP 0.5A - - - - - - - -
RS Stock No. 161-7244
Mfr. Part No.0712233
$27.251
Each (In a Box of 20)
units
- - - - - - - - - - - - - -
RS Stock No. 175-1575
Mfr. Part No.GV4PEM12N6
$895.40
Each
units
12.5A 3 TeSys 690V ac 116mm GV4PEM - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 409-794
Mfr. Part No.1410-L210-L2F1-S02-6.3A
BrandETA
$23.98
Each
units
6.3A 1 - - 33mm 1410-L - - - - - - - -
RS Stock No. 409-873
Mfr. Part No.1610-21-8A
BrandETA
$12.64
Each
units
8A 1 - 32V dc 20mm 1610 - - - - - - - -
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