DEHN DSH ZP B2 TNC 255 Combined Lightning Current and Surge Arrester Type 1+2 DEHNshield ZP 909330

The DEHN DSH ZP B2 TNC 255 combines Type 1 and Type 2 surge protection in a single 4-module DIN-rail device for TN-C systems. Its spark gap technology handles lightning currents up to 25 kA per pole (10/350 µs) without an external backup fuse up to 315 A gG, simplifying installation and reducing component count.

Highlights

• Integrated backup fuse: no external fuse needed up to 315 A gG
• RADAX Flow spark gap technology for high follow current extinguishing capability (50 kA rms)
• Voltage protection level ≤ 1.5 kV for sensitive downstream equipment
• Fast response time ≤ 100 ns
• Wide operating temperature range: -40 °C to +80 °C

In daily use

Designed for main distribution boards, the DEHNshield ZP 909330 protects against both direct lightning strikes and switching overvoltages. Its screw terminals and 35 mm DIN-rail mounting allow quick replacement or retrofit in existing installations. The red thermoplastic enclosure provides clear identification in the cabinet.

Full specifications

• SPD type: Combined lightning current and surge arrester, Type 1 + Type 2
• Network configuration: TN-C
• Number of poles: 3-pole
• Maximum continuous operating voltage (Uc): 255 V AC
• Nominal voltage (Un): 230 V AC
• Max. lightning current (Iimp) (10/350 µs): 25 kA per pole
• Nominal discharge current (In) (8/20 µs): 25 kA per pole
• Voltage protection level (Up): ≤ 1.5 kV
• Follow current extinguishing capability (Ifi): 50 kA rms
• Response time (tA): ≤ 100 ns
• Integrated backup fuse: Yes (no external backup fuse required up to 315 A gG)
• Mounting type: 35 mm DIN rail
• Housing width: 4 modules (approx. 72 mm)
• Connection terminals: Screw terminals
• Enclosure material: Thermoplastic, red
• Operating temperature range: -40 °C to +80 °C
• Protection degree: IP20
• Standards compliance: IEC 61643-11 / EN 61643-11
• Technology: Spark gap (RADAX Flow)

Final note

With its integrated backup fuse and high follow current extinguishing capability, this arrester offers a compact and reliable solution for TN-C main distribution boards.