DEHN DSH ZP B2 TT 255 Type 1+2 Combined Surge Arrester 3+1 255V 909331

This Type 1+2 combined surge arrester from DEHN provides lightning and surge protection for low-voltage systems, featuring a high discharge capacity and a compact 3+1 configuration for TT and TN-S earthing systems.

Advantages

Combines lightning current and surge protection in one device, offering a total lightning impulse current of 50 kA and a voltage protection level of ≤1.5 kV. The 3+1 circuit with NPE module ensures safe operation in TT systems, while the follow current extinguishing capability of 50 kA rms ensures reliable interruption of power follow currents.

Suitable for

• TT and TN-S earthing systems
• Main distribution boards and sub-distribution boards
• Protection of sensitive electronic equipment

Key specifications

• SPD type: Type 1 + Type 2
• Max. continuous operating voltage (Uc): 255 V AC
• Lightning impulse current (Iimp) per pole: 12.5 kA (10/350 µs)
• Total lightning impulse current (Itotal): 50 kA (10/350 µs)
• Nominal discharge current (In): 20 kA (8/20 µs)
• Voltage protection level (Up): ≤1.5 kV
• Follow current extinguishing capability (Ifi): 50 kA rms
• Response time (tA): ≤100 ns
• Number of poles: 3-pole + NPE (3+1 configuration)
• Mounting type: 35 mm DIN rail
• Connection cross-section: 1.5 - 35 mm² solid / 1.5 - 25 mm² stranded
• Operating temperature range: -40 °C to +80 °C
• Housing material: Thermoplastic, red, UL 94 V-0

Recommendations

Install in main distribution boards to protect against direct lightning strikes and surges, ensuring compliance with EN 61643-11.