DEHNrail DR M 4P 255 tyyppi 2 ylijännitesuoja 4-napainen 255V 953400

The DEHNrail DR M 4P 255 stands out among Type 2 surge arresters with its 4-pole protection for all three phases plus neutral-to-earth, ensuring comprehensive protection in TN-S and TT systems. Its thermally monitored varistors and clear optical status indication provide immediate visual confirmation of device health.

Highlights

• 4-pole protection: L1-N, L2-N, L3-N, N-PE
• Maximum continuous operating voltage: 255 V AC
• Nominal discharge current: 20 kA (8/20 µs)
• Maximum discharge current: 40 kA (8/20 µs)
• Voltage protection level: ≤ 1.2 kV
• Optical status indication (green/red)
• Mounts on 35 mm DIN rail, width 4 TE (70 mm)

In daily use

Installation is straightforward on standard 35 mm DIN rails. The device's compact 4-module width saves space in distribution boards. The green/red indicator allows quick status checks without additional tools, reducing maintenance time.

Full specifications

• Type: Type 2 surge arrester
• Nominal voltage: 230 / 400 V AC (50/60 Hz)
• Maximum continuous operating voltage: 255 V AC
• Nominal discharge current (In): 20 kA (8/20 µs)
• Maximum discharge current (Imax): 40 kA (8/20 µs)
• Voltage protection level (Up): ≤ 1.2 kV
• Number of poles: 4
• Protection paths: L1-N, L2-N, L3-N, N-PE
• Mounting type: 35 mm DIN rail
• Housing material: Thermoplastic
• Operating temperature range: -40 °C to +80 °C
• Degree of protection: IP20
• Short-circuit withstand capability: 50 kA (with max. backup fuse)
• Recommended backup fuse: 125 A (gL/gG)
• Disconnector: Thermally monitored varistor
• Status indication: Optical (green/red)
• Module width: 4 TE (70 mm)

Final note

DEHN's thermally monitored varistor technology ensures reliable disconnection at end of life, preventing potential fire hazards and maintaining system integrity.