DEHN DV M2 TNS 255 FM Combined Arrester Type 1+2+3, 4-Pole, TN-S, 255 V 956405

Combined surge protective device (SPD) providing Type 1, Type 2, and Type 3 protection in a single unit. Designed for TN-S earthing systems, this 4-pole arrester safeguards low-voltage installations against lightning currents and transient overvoltages, ensuring reliable protection for sensitive equipment.

Advantages

Integrates three protection stages, simplifying installation and reducing space requirements on the DIN rail. The device offers a high follow current extinguishing capability of 50 kA rms and a low voltage protection level of ≤1.5 kV, ensuring effective protection even under severe surge conditions. Remote signaling via a potential-free changeover contact enables integration into building management systems for status monitoring.

Suitable for

• Main distribution boards in residential and commercial buildings
• Industrial installations with TN-S earthing systems
• Protection of sensitive electronic equipment against lightning and switching surges

Key specifications

• Maximum continuous operating voltage: 255 V AC
• Nominal discharge current (8/20 µs): 20 kA
• Impulse current (10/350 µs): 12.5 kA per pole
• Voltage protection level: ≤1.5 kV
• Follow current extinguishing capability: 50 kA rms
• Response time: <100 ns
• Operating temperature range: -40 °C to +80 °C
• Mounting: 35 mm DIN rail
• Protection degree: IP20
• Housing material: Thermoplastic, UL 94 V-0
• Terminal cross-section (max. solid): 35 mm²
• Short-circuit withstand capability: 50 kA rms

Recommendations

Install at the service entrance to provide comprehensive protection for the entire electrical installation. Ensure proper coordination with downstream surge protective devices for optimal performance.