Dehn DEHNventil M TNC 255 FM Surge Arrester Type 1+2 3P 25/75kA 1.5kV

The Dehn DEHNventil M TNC 255 FM is a high-performance combined lightning current and surge arrester designed for Type 1+2 protection in 3-pole TNC electrical systems. This robust device is engineered to safeguard sensitive electrical installations by effectively managing high-energy atmospheric discharges and transient switching surges. With its integrated remote signaling contact, it allows for proactive monitoring of the device's operational status, ensuring continuous protection for industrial and residential power grids.

Advantages

This surge arrester offers exceptional reliability through its coordinated spark-gap technology, which ensures high discharge capacity while maintaining a low voltage protection level. The modular design simplifies maintenance and replacement procedures without requiring a complete system shutdown. Its ability to handle both lightning currents and switching surges in a single compact unit makes it an efficient solution for comprehensive surge protection, reducing the risk of damage to connected equipment and improving overall system longevity.

Suitable for

• Industrial power distribution boards
• Residential main distribution panels
• TNC electrical network configurations
• Protection against direct and indirect lightning strikes

This device is not suitable for use in electrical systems other than 3-pole TNC configurations, such as TT or IT systems, where different wiring topologies are required. It is also not intended for installation in environments with extreme moisture or corrosive atmospheres unless housed in an appropriately rated protective enclosure.

Key specifications

• Type: 1+2 combined lightning current and surge arrester
• System compatibility: 3-pole TNC
• Discharge capacity: 25/75kA
• Voltage protection level: 1.5kV
• Remote signaling: Integrated FM contact

Installation should be performed by a qualified electrician in accordance with local safety regulations. The device is typically mounted on a standard DIN rail within the main distribution board. Ensure that the connection cables are kept as short as possible to maintain the effectiveness of the surge protection. The remote signaling contact can be wired to a monitoring system to provide real-time alerts regarding the status of the arrester modules.

What to consider before purchase

• Verify that your electrical system is a 3-pole TNC configuration
• Ensure sufficient space is available on the DIN rail within the distribution board
• Check that the voltage protection level meets the requirements of your sensitive equipment

Regularly inspect the status indicator on the device to ensure the protection modules are functioning correctly. If the indicator shows a fault, replace the affected module immediately to maintain system safety.