FUCHSBERG ELECTRIC GMBH FUCHS Type 1+2 Surge Arrester HSA 255 TT 12.5, 4-Pole, Busbar Mount 556720

With an impulse current rating of 12.5 kA (10/350 µs) per pole, this combined Type 1+2 surge arrester provides robust protection for TT and TN-S systems. Its direct 40 mm busbar mounting and 4-pole configuration simplify installation in distribution boards.

Overview

The FUCHSBERG ELECTRIC HSA 255 TT 12.5 is a 4-pole surge protective device designed for use in TT and TN-S network systems. It combines Type 1 and Type 2 protection in a single unit, making it suitable for both lightning current and surge voltage protection. The device mounts directly onto a 40 mm busbar, saving space and reducing wiring effort.

What stands out

• High impulse current withstand: 12.5 kA per pole (10/350 µs)
• Nominal discharge current of 20 kA (8/20 µs) and maximum discharge current of 50 kA (8/20 µs)
• Low voltage protection level of less than 1.5 kV
• Visual status indication: green for OK, red for replacement needed
• Follow current extinguishing capability of 100 A

Technical details

• Surge protection type: Type 1+2 combined arrester
• Network system compatibility: TT, TN-S
• Number of poles: 4 (3+1 protection)
• Maximum continuous operating voltage (Uc): 255 V AC
• Response time: less than 25 ns
• Operating temperature range: -40°C to +80°C
• Enclosure protection rating: IP20
• Housing material: thermoplastic, flame retardant
• Standards compliance: IEC 61643-11, EN 61643-11

Our verdict

A reliable and compact surge protection solution for industrial and commercial electrical installations, offering combined Type 1+2 protection with high discharge capacity and easy busbar mounting.