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
New
RS Stock No. 201-5736
Mfr. Part No.2800886
$87.80
Each
units
8A 2 Trabtech 80V dc 24.6mm CB TM2 - - - - - - - -
RS Stock No. 782-8082
Mfr. Part No.W31-X2M1G-35
$60.20
Each
units
35A 1 - 50 V dc, 240 V ac 0.69in W31 - - - - - - - -
RS Stock No. 175-1498
Mfr. Part No.GV4P115N
$1,508.71
Each
units
115A 3 TeSys 690V ac 165mm GV4P - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 282-6523
Mfr. Part No.2210-T210-K0M1-H121-2A
BrandETA
$64.59
Each
units
2A 1 - - 83.5mm 2210 - - - - - - - -
RS Stock No. 175-1595
Mfr. Part No.GV4PEM80S6
$1,582.12
Each
units
80A 3 TeSys 690V ac 116mm GV4PEM - - 10 kA @ 660 → 690 V ac - - - - -
RS Stock No. 173-9832
Mfr. Part No.4400.0052
BrandSchurter
$9.542
Each (In a Box of 100)
units
12A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 712-7650
Mfr. Part No.3120-F551-H7T1-W14DR4-2.5A
BrandETA
$49.55
Each
units
2.5A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 175-1580
Mfr. Part No.GV4PEM25N
$823.39
Each
units
25A 3 TeSys 690V ac 116mm GV4PEM - - 8 kA @ 660 → 690 V ac - - - - -
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. 175-1530
Mfr. Part No.GV4PE115N
$874.75
Each
units
115A 3 TeSys 690V ac 116mm GV4PE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1434
Mfr. Part No.GV4L115S
$921.82
Each
units
115A 3 TeSys 690V ac 165mm GV4L - - 10 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-1515
Mfr. Part No.GV4P80S
$1,585.58
Each
units
80A 3 TeSys 690V ac 165mm GV4P - - 10 kA @ 660 → 690 V ac - - - - -
RS Stock No. 173-9829
Mfr. Part No.4400.0031
BrandSchurter
$9.542
Each (In a Box of 100)
units
12A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 284-6224
Mfr. Part No.4411.0027
BrandSchurter
$31.42
Each
units
30A 1 - 240V ac 11.5mm T13 - - - - - - - -
RS Stock No. 175-1440
Mfr. Part No.GV4L25N6
$786.91
Each
units
25A 3 TeSys 690V ac 165mm GV4L - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 774-0089
Mfr. Part No.FC67202
$5.47
Each
units
1.4A 2 - 250V ac 6mm AN - - - - - - - -
RS Stock No. 173-9843
Mfr. Part No.4411.0129
BrandSchurter
$29.606
Each (In a Box of 20)
units
1A 1 - 240V ac - T13 - - - - - - - -
RS Stock No. 175-1536
Mfr. Part No.GV4PE12S
$791.31
Each
units
12.5A 3 TeSys 690V ac 116mm GV4PE - - 10 kA @ 660 → 690 V ac - - - - -
RS Stock No. 728-8632
Mfr. Part No.105-P10-10A
BrandETA
$39.18
Each
units
10A 1 - - - 105 - - - - - - - -
RS Stock No. 175-1465
Mfr. Part No.GV4LE115N6
$782.14
Each
units
115A 3 TeSys 690V ac 116mm GV4LE - - 8 kA @ 660 → 690 V ac - - - - -
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