Thermomagnetic circuit breakers - function and design
Thermomagnetic circuit breakers are triggered both thermally and magnetically. Both mechanisms, a bimetal and a solenoid, work independent of each other. That means: in the event of short circuit, thermomagnetic circuit breakers trigger faster than thermal circuit breakers.
Therefore, in the event of a short circuit, the trigger mechanism is actuated within 3 - 5 ms. The devices can be switched on again at any time.
The new thermomagnetic circuit breakers are all available in plug-in versions.
- A monitoring and remote signaling concept that is independent of the location
- Maximum overcurrent protection even over long cable distances - thanks to SFB trigger characteristic
- Maximum system availability due to the compact design with precise nominal current levels
- Bridgeable circuit breakers (in the base element)
- Easy installation, thanks to uniform plug-in housing concept
Areas of application
Thanks to the various trigger characteristics, the circuit breakers can be used in a wide range of applications.
For example, they are ideal for protecting programmable controllers, valves, motors, and frequency inverters.
SFB trigger characteristic
The characteristic prevents unnecessary prior switch-off in the event of brief current increases such as starting currents
Furthermore, the SFB trigger characteristic prevents undesirably long overcurrents since they can cause dangerous heating-up in the equipment.