Surge arrester DEHNguard SMP TNS 275 FM Type 2+Type 3 942407

Electrical installation protection with DEHNguard SMP TNS 275 FM

The DEHNguard SMP TNS 275 FM surge arrester is a multipolar device designed for effective protection of electrical installations against the effects of surges, both impulse (lightning strikes) and transient (e.g. switching of large loads). Classified as type 2+type 3 according to PN-EN 61643-11, it is a key element in the construction of a comprehensive lightning protection system. This is particularly important in residential, commercial and industrial buildings, where failures caused by surges can lead to significant financial losses and downtime.

This arrester is ideal for use in TN-S networks, providing protection at the transition between zones 0B – 1 and higher within the Zonal Lightning Protection Concept. Because it combines the functions of two types of arresters, it offers versatile protection and simplifies the design of protection systems.

Construction and functionality for professionals

The DEHNguard SMP TNS 275 FM is distinguished primarily by its modular design with a replaceable protective module. This allows for quick replacement of a damaged element without the need to disassemble the entire device – which translates to minimizing downtime and reducing operating costs. Double plug-in terminals ( "push-in" technology) significantly facilitate and speed up installation, both branched cabling and series connections. The use of this technology eliminates the need for additional terminal blocks, saving space in the distribution cabinet.

The built-in remote signaling contact informs about the status of the device – enabling a quick response in the event of a failure or the need to replace the protective module. In addition, the device is equipped with a "Thermo Dynamic Control" disconnect device, which ensures reliable operation even in extreme conditions. A voltage protection level below 1.75 kV and a rated discharge current of 20 kA guarantee effective protection against the effects of surges. Short-circuit strength at 25 kArms ensures the safety of the installation even in the event of a short circuit.

Key benefits for end users and installers

• Versatile protection: The combination of type 2 and type 3 provides comprehensive protection against various types of surges.
• Easy installation: "Push-in" technology and double terminals significantly speed up installation and reduce the risk of errors.
• Fast diagnostics: Remote signaling contact enables immediate detection of failure and the need for replacement.
• Reliability: The "Thermo Dynamic Control" disconnect device ensures long-lasting and stable operation of the device.
• Compact dimensions: A width of only 4 modules allows for easy adaptation to existing distribution cabinets.
• Compliance with standards: Meets the requirements of PN-EN 61643-11, guaranteeing safety and compliance with regulations.
• Energy coordination: The possibility of energy coordination according to DIN EN 62305-4 ensures optimal protection of the entire lightning protection system.
• Damage indicator: Allows visual assessment of the device's condition without the need for disassembly.

The DEHNguard SMP TNS 275 FM surge arrester is an investment in the safety of your electrical installation and peace of mind resulting from the certainty of its reliable operation.