DEHN DSH ZP B TT 255 Combined Arrester Type 1+2 DEHNshield ZP Basic for TN-S / TT Systems, 230/400 V AC, 255 V UC, 3+1 Circuit, DIN Rail Mount, Red

Electrical surges from lightning strikes and switching operations can destroy sensitive equipment in residential and commercial installations. The DEHN DSH ZP B TT 255 combined arrester Type 1+2 provides robust protection for TN-S and TT systems, ensuring continuous operation of your electrical infrastructure. This DEHNshield ZP Basic unit is engineered to divert high-energy lightning currents and limit overvoltages, safeguarding your investment.

Who is it for

This surge protective device is ideal for electricians, panel builders, and facility managers who need reliable protection for main distribution boards in buildings with TN-S or TT earthing systems. It suits applications where space is limited and a compact, DIN-rail mountable solution is required.

Main features

• Combined Type 1+2 lightning and surge protection for TN-S / TT systems
• High lightning impulse current: 7 kA (10/350 µs) per pole L-N/PE, 14 kA N-PE
• Nominal discharge current 20 kA (8/20 µs), max discharge 40 kA per path
• Low voltage protection level < 1.5 kV for both L-N and N-PE
• Visual fault indication with green/red flag for quick status check
• Compact 2 TE (36 mm) width, mounts on 35 mm DIN rail (EN 60715)
• Complies with EN 61643-11 / IEC 61643-11 standards

Specifications

• Nominal voltage: 230 / 400 V AC
• Max continuous operating voltage (UC): 255 V AC
• Short-circuit withstand capability: 50 kArms with max backup fuse 160 A gG
• Operating temperature range: -40 °C to +80 °C
• Protection degree: IP20
• Number of poles: 3-pole + NPE

Tips

Install this arrester as close as possible to the incoming supply of the distribution board to maximize protection. Ensure proper earthing and follow local regulations. The green/red flag indicator allows for quick visual inspection; replace the unit if the flag shows red.