Dehnventil M2 TNC FM 956305 Surge Arrester Type 1+2+3 75kA 3-Pole for TNC Networks

The Dehnventil M2 TNC FM 956305 is a high-performance combined surge arrester engineered specifically for TNC electrical network systems. This advanced device integrates Type 1, Type 2, and Type 3 protection into a single compact unit, providing a robust defense against both direct lightning strikes and transient switching surges. With a total discharge capacity of 75kA, it ensures that sensitive electronic equipment and critical infrastructure remain protected from dangerous overvoltages.

Advantages

This surge arrester stands out due to its comprehensive multi-stage protection capability, which eliminates the need for additional coordinated surge protection devices. The integrated remote signaling contact allows for seamless integration into building management systems, providing real-time status monitoring and immediate notification of any operational issues. Its durable construction and high discharge capacity make it an essential component for maintaining the longevity and reliability of electrical installations in demanding environments.

Suitable for

• TNC electrical network systems
• Industrial and commercial building power distribution boards
• Protection of sensitive electronic equipment against lightning and switching surges
• Installations requiring coordinated Type 1, 2, and 3 protection

When it may not be suitable

This device is specifically designed for TNC network configurations and is not compatible with other earthing systems such as TT or IT networks without appropriate modifications. It should not be installed in environments that exceed its specified voltage or temperature ratings.

Key specifications

• Protection type: Type 1+2+3 combined arrester
• Network compatibility: TNC systems
• Total discharge capacity: 75kA
• Number of poles: 3-pole
• Remote signaling: Integrated contacts included

How to use

The device should be installed by a qualified electrician within the main distribution board at the transition point between the external supply and the internal installation. It must be mounted on a standard DIN rail. Ensure that the connection cables are kept as short as possible to minimize inductive voltage drops during a surge event. The remote signaling contacts should be wired to a monitoring system or an alarm indicator to ensure timely maintenance alerts.

What to consider before purchase

• Verify that your electrical network is a TNC system
• Ensure there is sufficient space in the distribution board for the 3-pole unit
• Check that the local lightning protection zone requirements match the device specifications

Usage recommendations

Regularly inspect the status indicator on the device to ensure it is functioning correctly. If the remote signaling contact triggers an alarm, the surge arrester module should be replaced promptly to maintain continuous protection for your electrical system.