In automation technology and process control, different communication technologies are used between the control system and sensors/actuators. DEHN has now developed a new surge protection module which is specifically suited for digital signals (DI/DO).

The BXT ML4 BPD 24 combined arrester protects 24 V DC interfaces with earthed negative pole.

In case of a fault, high short-circuit currents flow through battery-backed 24 V DC systems for supplying digital outputs. This may overload the arrester.

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.