DEHN DSH ZP B2 SG TNC 255 Combined Lightning Current and Surge Arrester Type 1+2 DEHNshield ZP 909430

The DEHN DSH ZP B2 SG TNC 255 is a combined lightning current and surge arrester Type 1+2 for TN-C systems, providing robust protection against direct lightning strikes and surges. Its key strength is a total lightning impulse current of 50 kA (10/350 µs) per phase, ensuring reliable protection for critical infrastructure.

Advantages

This arrester combines Type 1 and Type 2 protection in a single compact unit, saving space on the DIN rail. It features a high follow current extinguishing capability of 50 kA rms and a low voltage protection level of ≤1.5 kV, ensuring sensitive equipment remains safe. The thermoplastic housing is flame-retardant (UL 94 V-0) and designed for harsh environments with an operating temperature range of -40 °C to +80 °C.

Suitable for

• TN-C power supply systems
• Main distribution boards and sub-distribution boards
• Industrial facilities, commercial buildings, and infrastructure projects
• Protection of electrical installations against direct lightning strikes and surges

Key specifications

• SPD type: Combined lightning current and surge arrester Type 1+2
• Network system: TN-C
• Max. continuous operating voltage (Uc): 255 V AC
• Lightning impulse current (Iimp) per pole: 25 kA (10/350 µs)
• Total lightning impulse current (Iimp total): 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
• Max. backup fuse: 315 A gL/gG
• Short-circuit withstand capability: 50 kA rms
• Mounting: 35 mm DIN rail, 2.5 modules
• Degree of protection: IP20
• Housing material: Thermoplastic, red, UL 94 V-0
• Operating temperature range: -40 °C to +80 °C

Recommendations

For optimal protection, install the DEHNshield ZP at the service entrance of TN-C systems. Ensure proper coordination with downstream surge protective devices and verify that the backup fuse does not exceed 315 A.