Surge arrester DEHNrail M 2P 255 FM, 2-pole for 230 V AC network 953205

Protection of installations and devices with DEHNrail M surge protectors

The DEHNrail M 2P 255 FM surge protector is a two-pole device designed to protect electrical installations and connected receivers in a 230 V AC network. It belongs to type 3 surge protector class, which means it provides final protection against the effects of overvoltages that have passed through earlier stages of protection. This is a key element ensuring the safety and reliability of electronic devices in residential and commercial buildings.

Construction and application

The construction of the DEHNrail M is based on a modular design, which facilitates mounting on a DIN TH-35 mm mounting rail. The device is ready for connection, which significantly reduces installation time. Optical indication of the device status informs about its operation or damage – this is useful for both the installer during system start-up and the end user in the event of a failure. This surge protector finds application wherever protection against overvoltages is required, especially in places exposed to lightning strikes or frequent voltage fluctuations.

Key features and benefits

• High protection efficiency: Rated discharge current (8/20) at 3 kA (L-N) and 5 kA (L+N-PE) guarantees effective protection against the effects of overvoltages.
• Safe operation: It has a built-in contact for remote status signaling, which allows monitoring the device's operation and quick response in the event of a failure.
• Universal mounting: Mounting on a standard DIN TH-35 mm rail ensures compatibility with most electrical distribution boards.
• Overload protection: Maximum overcurrent protection at 25 A (both series and parallel) protects the circuit from damage caused by overload.
• Wide range of wires: Supports wires with a cross-section from 2.5 mm² (flexible) to 4 mm² (single-/multi-strand), providing flexibility in choosing power cables.
• Protection levels: Provides L-N protection level at 1.25 kV and L-PE/N-PE at 1.5 kV, minimizing the risk of damage to connected devices.
• Status indicator: Optical status indicator facilitates quick identification of a damaged module and the need for replacement.

The DEHNrail M 2P 255 FM surge protector is a solid and reliable solution for professionals and users looking for effective protection of their electrical installations against overvoltages. Its compact size and ease of installation make it an ideal choice for both new and modernized installations.