DEHN DSH ZP 2 LSG A TT 25 Surge Arrester Combination Type 1+2 2-Pole 255V 909231

Electricians and panel builders install the DEHN DSH ZP 2 LSG A TT 25 in main distribution boards to protect TT and TN-S systems from lightning currents and surges. This 2-pole combination arrester uses spark gap technology to safely divert high-energy transients to earth.

Key specifications

• Type 1 + Type 2 (Class I + Class II) surge protective device
• Nominal voltage: 230 V AC (50/60 Hz)
• Max. continuous operating voltage: 255 V AC
• Lightning impulse current (10/350 µs): 7 kA per pole
• Nominal discharge current (8/20 µs): 20 kA
• Voltage protection level: ≤ 1.5 kV
• Follow current extinguishing capability: 100 A rms
• Response time: < 100 ns
• Protection paths: L-N, N-PE
• Mounting on 35 mm DIN rail
• Enclosure: thermoplastic, red, UL 94 V-0
• Operating temperature: -40 °C to +80 °C
• Degree of protection: IP20
• Max. backup fuse: 315 A gG
• Short-circuit withstand capability: 50 kA rms
• Connection cross-section: 1.5–35 mm² solid / 1.5–25 mm² stranded

Why choose it

The spark gap technology provides reliable protection against direct lightning strikes, with no follow current issues and a low voltage protection level. Its compact 2-pole design simplifies installation in TT systems where both L-N and N-PE protection are required.

Ideal use cases

• Main distribution boards in residential and commercial buildings
• TT and TN-S power supply systems
• Protection of sensitive electronic equipment from lightning surges

Good to know

The device complies with IEC 61643-11 and EN 61643-11. It does not require an external backup fuse up to 315 A gG, reducing installation complexity.