DEHNguard Modular Surge Arrester for TN-C Systems Type 1 25kA 1-Pole IP20

Type 1 lightning current arrester with spark gap technology delivers robust protection for TN-C power systems against direct lightning strikes and high-energy surges. With a discharge capacity of 25 kA per pole (10/350 µs) and 50 kA total impulse current, it forms a reliable first line of defense in main distribution boards.

Advantages

The DEHNguard 952300 combines high discharge capacity with a compact 1-module design, saving valuable space on the DIN rail without compromising performance. The mechanical green/red fault indicator allows quick status checks at a glance, while the thermoplastic housing ensures durability in demanding environments. With a voltage protection level of ≤1.5 kV and response time under 100 ns, sensitive downstream equipment receives reliable protection.

Suitable for

• Main distribution boards in residential and commercial buildings with TN-C earthing systems
• Industrial facilities requiring Type 1 lightning protection per IEC 61643-11
• Installations where follow current extinguishing capability up to 50 kA rms is essential
• Compact electrical panels where every module width counts

Key specifications

• SPD type: Type 1 lightning current arrester
• System compatibility: TN-C systems
• Nominal voltage: 230/400 V AC
• Max. continuous operating voltage: 255 V AC
• Lightning impulse current (10/350 µs): 25 kA per pole, 50 kA total
• Voltage protection level: ≤1.5 kV
• Follow current extinguishing capability: 50 kA rms
• Response time: ≤100 ns
• Mounting: 35 mm DIN rail, 1 module (18 mm)
• Enclosure rating: IP20

Recommendations

For optimal protection, install the DEHNguard 952300 at the service entrance of TN-C systems. Combine with downstream Type 2 surge arresters for a complete protection concept. Regular inspection of the fault indicator ensures continued reliability.