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. 122-9268
Mfr. Part No.3400-P10-H-SI-0.5A
BrandETA
$70.62
Each
units
500mA 1 - - 42mm 3400 - - - - - - - -
RS Stock No. 175-1520
Mfr. Part No.GV4PE03N
$743.49
Each
units
3.5A 3 TeSys 690V ac 116mm GV4PE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1443
Mfr. Part No.GV4L50N
$688.76
Each
units
50A 3 TeSys 690V ac 165mm GV4L - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 882-2293
Mfr. Part No.0915768
$879.91
1 Box of 6
Box(es)
2A 2 - 65 V dc, 250 V ac 12.5mm TMCP 1 M1 300 2A - - - - - - - -
RS Stock No. 458-8627
Mfr. Part No.3120-F72N-P7T1-A20Q-10A
BrandETA
$54.81
Each
units
10A 2 - - 25mm 3120-F7 - - - - - - - -
RS Stock No. 175-1529
Mfr. Part No.GV4PE115B6
$774.42
Each
units
115A 3 TeSys 690V ac 116mm GV4PE - - 10 kA @ 500 V ac - - - - -
RS Stock No. 282-8721
Mfr. Part No.2210-T210-K0M1-H121-0.5A
BrandETA
$57.08
Each
units
500mA 1 - - 83.5mm 2210 - - - - - - - -
RS Stock No. 882-2322
Mfr. Part No.0915852
$880.40
1 Box of 6
Box(es)
- - - - - - - - - - - - - -
RS Stock No. 881-8244
Mfr. Part No.1689006
$14.39
Each (In a Box of 10)
units
- - - - - VS-09-ST-DSUB-1P-4S - - - - - - - -
RS Stock No. 409-873
Mfr. Part No.1610-21-8A
BrandETA
$12.64
Each
units
8A 1 - 32V dc 20mm 1610 - - - - - - - -
RS Stock No. 212-2130
Mfr. Part No.3130-F110-P7T1-W14QR7-5A
BrandETA
$36.22
Each
units
5A 1 - 50 V dc, 250 V ac 36mm 3130 - - - - - - - -
RS Stock No. 212-1929
Mfr. Part No.3130-F120-P7T1-W02Q-1A
BrandETA
$120.24
Each
units
1A 2 - - 36mm 3130 - - - - - - - -
RS Stock No. 175-1451
Mfr. Part No.GV4LE02N6
$597.93
Each
units
2A 3 TeSys 690V ac 116mm GV4LE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1474
Mfr. Part No.GV4LE25N
$617.53
Each
units
25A 3 TeSys 690V ac 116mm GV4LE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 728-8676
Mfr. Part No.1140-F111-P1M1-4A
BrandETA
$24.18
Each
units
4A 1 - - - 1140-F - - - - - - - -
RS Stock No. 175-1482
Mfr. Part No.GV4LE50S
$756.96
Each
units
50A 3 TeSys 690V ac 116mm GV4LE - - 10 kA @ 660 → 690 V ac - - - - -
RS Stock No. 284-6218
Mfr. Part No.4411.0108
BrandSchurter
$34.94
Each
units
20A 1 - 240V ac - T13 - - - - - - - -
RS Stock No. 175-1580
Mfr. Part No.GV4PEM25N
$923.19
Each
units
25A 3 TeSys 690V ac 116mm GV4PEM - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 801-7003
Mfr. Part No.0914183
$127.39
Each
units
16A 1 - 65 V dc, 250 V ac 12.5mm TMC 1 - - - - - - - -
RS Stock No. 175-1542
Mfr. Part No.GV4PE25S
$887.22
Each
units
25A 3 TeSys 690V ac 116mm GV4PE - - 10 kA @ 660 → 690 V ac - - - - -
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