When it comes to protecting loads at the 24 V level, conventional circuit breakers are steadily losing ground to electronic circuit breakers. Besides tighter tolerances and a more compact design, these offer further advantages that can really add value within a system if used correctly. When teamed with a higher-level control system, electronic circuit breakers support, via a digital input and output, active switching on or off of any output channel, resetting of tripped circuits and simultaneous reporting of current operating and error statuses. BLOCK multichannel circuit breakers only need up 5.25 mm per channel with all 8-channel modules and can be integrated into the overall control and monitoring process.

The tripping time depends on the level of overcurrent. In the event of a short circuit, the defective circuit will shut down within a few milliseconds. The level of the short circuit current depends on the current limiting of the feeding power supply as well as the line resistance.

The constant current limiting of 1.7 times the rated current enables especially high-capacity loads to be switched on reliably. Two switch-off points within the tripping characteristic allow a temporary increase in current fl ow caused by start-ups, breaking processes, speed and direction changes of DC motors.

The NEC Class 2 circuit breaker has a selfadjusting current limiting that prevents the output power from exceeding the 100 W limit.

Space requirement 8 channels

Space requirement 8 channels

Space requirement 8 channels



*    Due to optimized distribution of the inrush
**  Without current spikes for tripping of circuit breakers