Surge arrester DEHNshield TNS 255 "DSH TNS 255" 941400

Surge protection for TN-S systems

The DEHNshield TNS 255 surge arrester, catalog number 941400, is an advanced device designed for comprehensive protection of electrical installations against the effects of atmospheric and switching surges. It is a combined Type 1 and Type 2 arrester, based on spark gap technology, which ensures high efficiency and reliability. The device is specifically designed for TN-S network systems, offering optimal safety for connected devices.

Design and characteristic features

DEHNshield TNS 255 is distinguished by its compact design, occupying only 4 modules on a TH-35 mm DIN rail. This feature is particularly important when space in the distribution board is limited. The use of a non-fused spark gap technology translates into a longer service life and lower maintenance requirements. The device has a visual status indicator (green/red), which facilitates quick identification of any failures. Importantly, this arrester enables equipotential bonding, providing an additional layer of protection for end devices.

Parameters and application

The arrester is characterized by high technical parameters, such as an impulse current of 50 kA (10/350 µs) and a residual current extinguishing capability of 25 kA RMS. The L-PE and N-PE protection level is 1.5 kV. The maximum permissible conductor cross-section is 35 mm², which allows connection to a wide range of installations. The device is designed for mounting on a TH-35 mm DIN rail and meets the requirements of EN 61643-11. Thanks to energy coordination with end devices (up to 10m), it ensures comprehensive protection of the entire electrical system. The use of the DEHNshield TNS 255 arrester is particularly recommended in residential, commercial and industrial buildings, where surge protection is crucial for ensuring continuity of operation and safety of the installation.