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.


...
Read more Read less

Filters

Viewing 241 - 260 of 762 products
Results per page
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. 284-5811
Mfr. Part No.4400.0047
BrandSchurter
$14.59
Each
units
2A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 728-8670
Mfr. Part No.1140-F111-P1M1-8A
BrandETA
$21.13
Each
units
8A 1 - - - 1140-F - - - - - - - -
New
RS Stock No. 201-5504
Mfr. Part No.2800856
$51.77
Each
units
16A 1 Trabtech 50V dc 12.3mm CB TM1 - - - - - - - -
RS Stock No. 286-4092
Mfr. Part No.3120-F521-H7T1-W01D-1A
BrandETA
$71.27
Each
units
1A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 175-1511
Mfr. Part No.GV4P80B
$1,596.37
Each
units
80A 3 TeSys 690V ac 165mm GV4P - - 10 kA @ 500 V ac - - - - -
RS Stock No. 830-4303
Mfr. Part No.4404.0103
BrandSchurter
$6.11
Each
units
12A 1 - 48 V dc, 240 V ac 19mm T9 - - - - - - - -
RS Stock No. 729-2868
Mfr. Part No.3600-P10-Si-16A
BrandETA
$189.48
Each
units
16A 1 - - 11.5mm 3600 - - - - - - - -
RS Stock No. 801-6895
Mfr. Part No.0712123
$34.94
Each
units
250mA 1 - 65 V dc, 250 V ac 8.2mm TCP 0.25A - - - - - - - -
RS Stock No. 173-9831
Mfr. Part No.4410.0039
BrandSchurter
$34.788
Each (In a Box of 20)
units
600mA 1 - 240V ac - T12 - - - - - - - -
RS Stock No. 125-1367
Mfr. Part No.A9C64416
$658.28
Each
units
16A 4 Acti 9 - - iC60H Commercial, Residential - 15 kA @ 380 → 415 V ac, 30 kA @ 220 → 240 V ac MCB - - - -
RS Stock No. 175-1441
Mfr. Part No.GV4L50B
$870.83
Each
units
50A 3 TeSys 690V ac 165mm GV4L - - 10 kA @ 500 V ac - - - - -
RS Stock No. 175-1466
Mfr. Part No.GV4LE115S
$885.29
Each
units
115A 3 TeSys 690V ac 116mm GV4LE - - 10 kA @ 660 → 690 V ac - - - - -
RS Stock No. 175-0381
Mfr. Part No.3120-F521-P7T1-W01D-1A-A04010111M
BrandETA
$96.39
Each
units
1A 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
RS Stock No. 855-7368
Mfr. Part No.0912033
$1,137.31
1 Box of 5
Box(es)
- - - - - - - - - - - - - -
RS Stock No. 333-243
Mfr. Part No.201-2A
BrandETA
$57.47
Each
units
2A 1 - - 80mm 201 - - - - - - - -
New
RS Stock No. 201-6351
Mfr. Part No.2800835
$51.77
Each
units
500mA 1 Trabtech 50V dc 12.3mm CB TM1 - - - - - - - -
RS Stock No. 175-1590
Mfr. Part No.GV4PEM80B
$789.60
Each
units
80A 3 TeSys 690V ac 116mm GV4PEM - - 10 kA @ 500 V ac - - - - -
RS Stock No. 175-1546
Mfr. Part No.GV4PE50N
$702.71
Each
units
50A 3 TeSys 690V ac 116mm GV4PE - - 8 kA @ 660 → 690 V ac - - - - -
RS Stock No. 173-9834
Mfr. Part No.4410.0076
BrandSchurter
$34.788
Each (In a Box of 20)
units
4A 1 - 240V ac - T12 - - - - - - - -
RS Stock No. 782-6604
Mfr. Part No.W33-T2N1Q-20
$82.11
Each
units
20A 2 - 250V ac 21.59mm W33 - - - - - - - -
Related Products
MEM 250V DIN rail mount RCD’s and MCB’s ...
Description:
MEM 250V DIN rail mount RCD’s and MCB’s etc, for use as spares and replacements in Memera consumer units. Complies with BS EN 60898Accept cable up to 25mm²Thermal/magnetic operation. Positive contact indication (red-on, green-off)1, 2 or 3 pole.
All-current-sensitive FI circuit breaker for detection of residual ...
Description:
All-current-sensitive FI circuit breaker for detection of residual AC currents, pulsating and smooth residual DC currents. Increased operating reliability in networks with capacitive impedances based on adapted actuation characteristic. Switch handle and test button may be locked via handle lock. ...
Typical applications include protection of electrical systems of ...
Description:
Typical applications include protection of electrical systems of passenger cars, trucks, buses, watercraft and extra-low voltage wiring systems. Particularly suitable for installation in difficult-to-access locations. With reset button and manual release facility. Service short-circuit breaking capacity 300 ...
PCB mounting. Solder terminals. Ultra-miniature, fast-action. High speed ...
Description:
PCB mounting. Solder terminals. Ultra-miniature, fast-action. High speed tripping characteristic (typically less than 1 second at twice nominal current rating)White pushbutton, manual reset for enhanced PCB safety. Single in-line PCB layout for simplicity. Typical life 300 operations at twice nominal ...