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.

Additional advantages

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

Thermomagnetic circuit breaker with push-in connection technology

Areas of application

Machine control cabinet

Thermomagnetic device circuit breakers are used primarily in information and communication technology as well as process control.

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

Thermomagnetic device circuit breakers with the SFB (Selective Fuse Breaking) trigger characteristic provide maximum overcurrent protection - even in large systems with long cable paths.

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.