The Pepperl+Fuchs Z728 Zener Barrier is a single-channel, positive-polarity DC barrier that safeguards intrinsically safe circuits by limiting energy transfer from safe to hazardous areas.

It uses reverse-connected zener diodes to clamp overvoltage conditions; if voltage exceeds safe limits, the diodes conduct and the internal fuse isolates the hazardous-area circuit.

This reliable protection makes the Z728 ideal for sensors, switches, and low-power field devices in Zone 0, 1, and 2 hazardous locations.

Its slim DIN-rail design, robust construction, and global hazardous-area approvals make it suitable for industrial control, fire protection, process automation, and safety-critical signalling applications.

• Single-channel DC zener barrier with positive polarity

• Prevents transfer of excessive energy into hazardous areas

• Suitable for Zone 0, Zone 1 and Zone 2 installations

• Reverse-connected zener diodes with integrated fuse protection

• DIN rail mountable slim terminal housing

• Designed for intrinsically safe sensor and signal circuits

• Global hazardous-area approvals including ATEX, IECEx, FM and UL

• Compact design ideal for high-density control panels