Zener diode barriers

Turck has introduced MZB series Zener diode barriers, designed to effectively limit excess energy before it reaches a hazardous area. The MZB barriers provide removable terminals within an efficient and space-saving design - with channels as small as 6.3 mm wide - to consume minimal panel space. Additionally, the MZB series features a bussed power feed and offers both relay and solid-state switch models.

Each channel of the MZB Zener diode barriers is fitted with two stages of pulse-tested Zener diodes and a terminating resistor. If an electrical fault such as an overvoltage occurs in the non-hazardous area of the barrier, the Zener diodes limit the voltage available to hazardous area circuits, while the series resistance limits the current. Within this circuit is a fuse designed to immediately and safely rupture if the excess energy continuously applied to the barrier exceeds the design criteria for the loop.