DEHN DEHNrail M 2-Pole 255V Type 2 Surge Protective Device 953205

The DEHNrail M 2-pole surge protective device is a compact, DIN-rail mountable Type 2 SPD designed to protect low-voltage installations from transient overvoltages. Its 255 V maximum continuous operating voltage suits 230 V single-phase systems, while the visual fault indicator provides immediate status recognition without additional tools.

Highlights

• Type 2 surge protection per EN 61643-11 / IEC 61643-11
• 2-pole design for single-phase AC systems
• Nominal discharge current (In) of 20 kA (8/20 µs)
• Maximum discharge current (Imax) of 40 kA (8/20 µs)
• Voltage protection level (Up) ≤ 1.2 kV
• Visual fault indication: green = healthy, red = faulty
• Mounts on 35 mm DIN rail (EN 60715), 2 modules wide

In daily use

Installed in distribution boards, the DEHNrail M 2-pole 255 V protects connected equipment from surge damage. Its response time of ≤ 25 ns ensures fast clamping of transients, while the maximum back-up fuse rating of 125 A gG allows integration into standard circuits. The device operates across a wide temperature range from -40 °C to +80 °C and is rated IP20 for indoor use. Connection cross-sections up to 35 mm² solid or 25 mm² stranded accommodate typical wiring.

Full specifications

• SPD type: Type 2
• Number of poles: 2
• Nominal voltage AC (UN): 230 V
• Maximum continuous operating voltage AC (UC): 255 V
• Nominal discharge current (In) (8/20 µs): 20 kA
• Maximum discharge current (Imax) (8/20 µs): 40 kA
• Voltage protection level (Up): ≤ 1.2 kV
• Response time (tA): ≤ 25 ns
• Max. back-up fuse (L-L/L-N): 125 A gG
• Mounting type: 35 mm DIN rail (EN 60715)
• Fault indication: Visual (green = healthy, red = faulty)
• Operating temperature range: -40 °C to +80 °C
• Degree of protection: IP20
• Standards compliance: EN 61643-11 / IEC 61643-11
• Connection cross-section (max.): 35 mm² (solid) / 25 mm² (stranded)
• Width in DIN modules: 2 TE (36 mm)

Final note

The DEHNrail M 2-pole 255 V combines reliable surge protection with a compact footprint, making it a practical choice for residential and commercial distribution boards.