DEHN DSH ZP 2 TNS 255 Combined Lightning Current and Surge Arrester Type 1+2 DEHNshield ZP 2 909540

Electrical contractors and panel builders install the DEHN DSH ZP 2 TNS 255 in three-phase TNS power distribution boards to protect downstream equipment from direct lightning strikes and switching surges. This combined Type 1+2 arrester handles lightning impulse currents up to 7 kA per pole (10/350 µs) and nominal discharge currents of 20 kA (8/20 µs), with a total impulse current rating of 21 kA.

Key specifications

• SPD type: Combined lightning current and surge arrester
• SPD class: Type 1 + Type 2
• Network configuration: TNS (3-phase + Neutral + Earth)
• Max. continuous operating voltage (Uc): 255 V AC
• Nominal discharge current (In) (8/20 µs): 20 kA (L-N, N-PE)
• Lightning impulse current (Iimp) (10/350 µs): 7 kA (L-N, N-PE)
• Total lightning impulse current (Iimp total): 21 kA
• Voltage protection level (Up): ≤ 1.5 kV
• Follow current extinguishing capability (Ifi): 50 kA rms
• Short-circuit withstand capability (Isccr): 50 kA rms
• Response time (tA): < 100 ns
• Number of poles: 4-pole (3+1 configuration)
• Mounting type: 35 mm DIN rail
• Module width: 4 TE (72 mm)
• Operating temperature range: -40 °C to +80 °C
• Degree of protection: IP20
• Standards compliance: IEC 61643-11 / EN 61643-11
• Technology: Spark-gap based (RADAX Flow)
• Integrated backup fuse: No (requires external)

Why choose it

The DEHNshield ZP 2 combines high discharge capacity with a compact 4-module width, simplifying installation in space-constrained distribution boards. Its spark-gap technology ensures reliable follow current extinguishing without the need for an integrated fuse, reducing maintenance requirements.

Ideal use cases

• Protection of main distribution boards in residential and commercial buildings
• Surge protection for industrial control systems and machinery
• Lightning protection for photovoltaic installations and EV charging infrastructure

Good to know

The arrester is designed for 35 mm DIN rail mounting and operates within a temperature range of -40 °C to +80 °C. It complies with IEC 61643-11 and EN 61643-11 standards.