DEHN Surge Arrester Type 2 TNC 275V 40kA 3-Pole

Electrical surges from lightning or switching operations can damage sensitive equipment in three-phase TNC networks. This surge arrester diverts transient overvoltages safely to ground, protecting connected devices.

Who is it for

Electricians and panel builders installing surge protection in commercial and industrial three-phase TNC systems with a combined PEN conductor.

Main features

• Type 2 surge protection for TNC networks
• High discharge capacity: 20 kA nominal, 40 kA maximum
• Low voltage protection level ≤ 1.3 kV
• Fast response time under 25 ns
• Thermal disconnector and optical status indication
• Remote signaling contact for monitoring
• Compact 3-module DIN rail mount

Specifications

• SPD type: Type 2 / Class II
• Network configuration: TNC (3-phase, 4-wire, combined PEN)
• Nominal voltage (Un): 230 / 400 V AC
• Max. continuous operating voltage (Uc): 275 V AC
• Nominal discharge current (In) (8/20 µs): 20 kA
• Max. discharge current (Imax) (8/20 µs): 40 kA
• Voltage protection level (Up): ≤ 1.3 kV
• Response time (tA): < 25 ns
• Follow current extinguishing capability (Ifi): 100 A rms
• Operating temperature range: -40 °C to +80 °C
• Mounting: 35 mm DIN rail
• Number of modules: 3 TE
• Remote signaling contact: Yes (changeover contact)
• Status indication: Optical, mechanical
• Thermal disconnector: Yes
• Degree of protection: IP20
• Short-circuit withstand capability (Isccr): 50 kA rms
• Housing material: Thermoplastic, red, UL 94 V-0
• Protection mode: L-PEN

Tips

Install as close as possible to the incoming supply. Ensure proper grounding and use appropriate backup fuses as per local regulations.