In automation technology and process control, different communication technologies are used between the control system and sensors/actuators. DEHN has now developed a new surgeprotection module which is specifically suited for digital signals (DI/DO).
The BXT ML4 BPD 24 combined arrester1 protects 24 V d.c. interfaces with earthed negative pole.
In case of a fault, high short-circuit currents flow through battery-backed 24 V d.c. systems for supplying digital outputs. This may overload the arrester.
Signal short-circuits and system faults – Prevent arrester failure
To prevent overload and failure of the arrester, the potential short-circuit current is limited by PTC resistors in the circuit. Thus, the BXT ML4 BPD 24 is ideally suited for circuits with short-circuit currents as high as 40 A in case of a fault.
Arrester testing during operation
Arresters can be easily tested without disconnecting the signal loop by means of the LifeCheck® monitoring system.
1 SPD class