Surge arrester T1+T2 8/50 4P 412253

Surge protection in electrical installations

This four-pole T1+T2 surge arrester is a key element in protecting electrical installations from the effects of lightning strikes and overvoltages originating from the grid. The device effectively protects connected devices, minimizing the risk of failure and costly repairs. This is particularly important in residential, commercial buildings, and installations sensitive to interference.

This arrester, catalog number 412253, is designed for mounting on a TH-35 mm DIN rail and occupies 4 module spaces. Its construction based on varistor technology ensures a fast response and effective suppression of surges. Its use in TT, TN-C, TN-S and TN-C-S systems makes it a universal solution for different types of installations.

Key features and parameters

• Type of protection: T1+T2 (formerly class B+C) – provides comprehensive protection against both atmospheric and switching surges. This means the device reacts to both direct lightning strikes and disturbances generated within the network.
• Rated discharge current (8/20 µs): 20 kA – a high value guarantees effective protection even with strong current pulses. The higher the value, the better the arrester copes with large surges.
• Maximum voltage (Uc): 320 V AC – permissible operating voltage of the device. This value determines the maximum voltage the arrester can withstand without damage.
• Protection level (Up): 1.7 kV – determines the maximum voltage that can pass to the protected devices during a surge. A lower value means better protection.
• Number of poles: 4P – designed to protect three-phase or single-phase circuits with a neutral conductor. This provides complete protection for the entire circuit.
• Optical indication: An optical indicator informs about the operation of the arrester, making it easier to identify the need for replacement. This allows for a quick response and avoids further problems.
• Compliance with standards: IEC/EN 61643-11 – confirms compliance with applicable safety and performance standards. This guarantees high quality and reliability of the device.

Installation and application

This arrester is intended for installation in main distribution boards, providing protection for the entire electrical installation. It is recommended to use it in conjunction with appropriate overcurrent protection (S 300 TX³/DX³ C 40A), which further increases system safety. The replaceable design with status indicators (green - working, orange - to be replaced) facilitates maintenance and allows for a quick response in the event of a failure. The maximum conductor cross-section is 35 mm² for single- and multi-strand conductors and 25 mm² for flexible conductors.