Surge arrester T1+T2 8/50 3P+N 412257

Electrical installation protection with Legrand ON300 surge limiters

This three-phase (3P+N) surge arrester from the ON300 series by Legrand is a key element in protecting electrical installations from the effects of lightning strikes and surges. The T1+T2 class device effectively protects electrical and electronic devices, minimizing the risk of failure and costly repairs. The use of built-in varistor and spark gap technology ensures a quick and effective response to sudden voltage increases.

Universal application and compliance with standards

This surge arrester is designed for mounting on a TH-35 mm DIN rail and finds application in a wide range of installations – both in residential and commercial buildings. It is compatible with TN, TT, TN-C, TN-C-S networks, making it a universal solution for different types of installations. It meets the requirements of IEC/EN 61643-11, guaranteeing high quality and reliability.

Key features and benefits

• High protection efficiency: Rated discharge current of 20 kA (8/20 µs) provides effective protection against strong surges.
• Versatility: Possibility of use in various network configurations (TN, TT, TN-C, TN-C-S) increases the range of applications.
• Fast response: Class T1+T2 guarantees a quick response to surges, minimizing the exposure time of devices to damage.
• Visual indication: Optical indication of operation facilitates identification of a damaged arrester and the need for replacement.
• Safety: Provides L-N protection up to 2 kV and N-PE protection up to 1.5 kV, protecting against various types of surges.
• Simple installation: Mounting on a standard TH-35 mm DIN rail simplifies installation and replacement.
• Large wire throughput: Supports wires with a cross-section of up to 35 mm² (multi-wire) and 25 mm² (flexible), ensuring compatibility with most installations.
• Compact size: Occupies only 4 modules on the DIN rail, saving space in the switchgear cabinet.

Technical parameters for professionals

The arrester is characterized by a rated AC voltage of 400 V and a maximum continuous operating AC voltage of 320 V. It has 4 poles (without grounding) and is designed to work with protective devices with a rated current of up to 40A (S 300 TX³/DX³ C recommended). The IP20 degree of protection provides basic protection against accidental contact. The device does not have a remote signaling contact or integrated backup protection.