DEHN DSH TNC 255 FM scaricatore combinato di corrente da fulmine e sovratensione Tipo 1+2 per sistemi TN-C trifase 941305

With a total lightning impulse current rating of 25 kA (10/350 µs), the DEHN DSH TNC 255 FM provides robust protection for 3-phase TN-C power systems against direct lightning strikes and surges.

Overview

The DEHN DSH TNC 255 FM is a Type 1+2 combined arrester designed for 3-phase TN-C systems. It offers a maximum continuous operating voltage of 255 V AC and a voltage protection level of ≤ 1.5 kV, ensuring reliable protection for downstream equipment.

What stands out

• Combined Type 1+2 protection per EN 61643-11
• High follow current extinguishing capability of 50 kA rms
• Remote monitoring via potential-free changeover contact
• Compact 4-module DIN rail mounting
• Wide operating temperature range from -40 °C to +80 °C

Technical details

• Nominal discharge current (8/20 µs): 20 kA
• Lightning impulse current per pole (10/350 µs): 7 kA
• Short-circuit withstand capability: 50 kA rms
• Response time: < 100 ns
• Connection: screw terminals, max 35 mm² stranded
• Enclosure: thermoplastic, red, UL 94 V-0
• Protection degree: IP20

Our verdict

A high-performance surge protective device for industrial and commercial TN-C installations, offering reliable lightning protection and easy integration.