DEHN DEHNventil M2 TNC 255 FM Combined Lightning Current and Surge Arrester Type 1+2+3, 3-Pole, 255 V AC, 35 mm DIN Rail

For TN-C power systems, the DEHNventil M2 TNC 255 FM merges Type 1, Type 2, and Type 3 surge protection into a single compact module—no separate coordination needed. Its spark-gap-free design eliminates leakage current and ensures maintenance-free operation, while the integrated remote signaling contact keeps you informed of protection status. This 3-pole arrester handles direct lightning strikes and transient overvoltages with a high discharge capacity, making it ideal for service entrances and sub-distribution boards where space is limited but protection cannot be compromised.

Highlights

• Combined Type 1+2+3 surge protective device (SPD) per IEC 61643-11
• Designed specifically for TN-C network systems (3 poles, no neutral)
• High discharge capacity: 7 kA (10/350 µs) per pole, 21 kA total lightning impulse current
• Low voltage protection level ≤ 1.5 kV for sensitive equipment
• Potential-free changeover contact for remote monitoring (FM version)
• Compact 3-module width for 35 mm DIN rail mounting
• Thermoplastic enclosure in red, UL 94 V-0 flame retardant
• Follow current extinguishing capability up to 50 kA rms

In daily use

Installed at the service entrance or sub-distribution board, the DEHNventil M2 TNC 255 FM acts as the first line of defense. Its spark-gap-free technology ensures no leakage current and a long service life, even in harsh electrical environments. The remote signaling contact allows integration into building management systems for proactive monitoring, reducing downtime and maintenance costs.

Full specifications

• Arrester type: Combined lightning current and surge arrester
• SPD class: Type 1 + Type 2 + Type 3
• Network system: TN-C
• Number of poles: 3
• Max. continuous operating voltage (Uc): 255 V AC
• Nominal discharge current (In) (8/20 µs) per pole: 20 kA
• Lightning impulse current (Iimp) (10/350 µs) per pole: 7 kA
• Total lightning impulse current (Iimp total): 21 kA
• Voltage protection level (Up) at In: ≤ 1.5 kV
• Follow current extinguishing capability (Ifi): 50 kA rms
• Response time (tA): < 100 ns
• Operating temperature range: -40 °C to +80 °C
• Mounting: 35 mm DIN rail
• Remote monitoring: Yes, potential-free changeover contact
• Standards compliance: IEC 61643-11 / EN 61643-11
• Short-circuit withstand capability (Isccr): 50 kA rms
• Max. backup fuse (gL/gG): 160 A
• Enclosure material: Thermoplastic, red, UL 94 V-0

Final note

For reliable, all-in-one surge protection in TN-C systems, the DEHNventil M2 TNC 255 FM delivers uncompromising performance in a space-saving design.