DEHN SET 3 DSH ZP B2 LSG 909657 Combined Lightning Current and Surge Arrester Set Type 1+2, 3+1 Poles, TT/TN-S, 230/400 V

The DEHN SET 3 DSH ZP B2 LSG 909657 is a combined lightning current and surge arrester set for main power supply systems, pre-metering areas, and metering panels. It combines Type 1 and Type 2 protection in a single spark-gap-based device, suitable for TT and TN-S earthing systems.

Highlights

• Combined Type 1 + Type 2 (Class I + II) protection per IEC/EN 61643-11
• 3+1 pole configuration (3 phase + neutral) for 230/400 V AC systems
• High discharge capacity: Iimp 7 kA (10/350 µs) per pole, Imax 50 kA (8/20 µs) per pole
• Low voltage protection level Up ≤ 1.5 kV
• Follow current extinguishing capability 50 kA rms
• Mounts on 35 mm DIN rail, IP20, operating temperature -40 °C to +80 °C

In daily use

This set is installed in the main power supply system, typically before the meter, to protect downstream equipment from lightning currents and surges. It requires an external upstream fuse; no integrated fuse or status indication is provided.

Full specifications

• Earthing system: TT, TN-S
• Nominal voltage: 230 / 400 V AC
• Max. continuous operating voltage (Uc): 255 V AC
• Nominal discharge current (In): 20 kA per pole (8/20 µs)
• Max. discharge current (Imax): 50 kA per pole (8/20 µs)
• Impulse current (Iimp): 7 kA per pole (10/350 µs)
• Voltage protection level (Up): ≤ 1.5 kV
• Follow current extinguishing capability (Ifi): 50 kA rms
• Short-circuit withstand capability (Isccr): 50 kA rms (with suitable upstream fuse)
• Number of poles: 3+1
• Mounting: 35 mm DIN rail
• Operating temperature: -40 °C to +80 °C
• Degree of protection: IP20
• Standards: IEC 61643-11, EN 61643-11
• Technology: Spark-gap-based
• Integrated fuse: No
• Status indication: No

Final note

DEHN SET 3 DSH ZP B2 LSG 909657 is a robust solution for lightning and surge protection in TT and TN-S systems, ensuring reliable protection for electrical installations.