FUCHSBERG ELECTRIC Type 2 Surge Arrester for TN-C Busbar, 3-Pole, 255V, 20kA, with Remote Signalling 556622

In industrial and commercial electrical installations, protecting busbar systems from transient overvoltages is critical. The FUCHSBERG ELECTRIC HSA 255 TNC12,5U surge arrester is a Type 2 (Class II) device designed for TN-C networks, mounted directly on the busbar via a voltage tap. It safeguards connected equipment from surges caused by switching operations or indirect lightning strikes.

Key specifications

• Nominal voltage: 230/400 V AC
• Max. continuous operating voltage (Uc): 255 V AC
• Nominal discharge current (In): 20 kA (8/20 µs)
• Max. discharge current (Imax): 40 kA (8/20 µs)
• Voltage protection level (Up): < 1.2 kV
• Response time: < 25 ns
• Protection mode: L-PEN, 3-pole
• Integrated thermal disconnector with optical status indication (green/red)
• Remote signalling contact: potential-free changeover
• Short-circuit withstand capability: 50 kA
• Operating temperature range: -40°C to +80°C
• Protection class: IP20
• Enclosure material: thermoplastic, flame-retardant

Why choose it

This arrester combines high discharge capacity with a compact design for busbar mounting. The integrated thermal disconnector and clear status indication allow quick visual inspection, while the remote signalling contact enables integration into building management systems for proactive monitoring.

Ideal use cases

• Protection of busbar distribution systems in industrial facilities
• TN-C power supply networks in commercial buildings
• Installations requiring remote monitoring of surge protection status

Good to know

The device complies with IEC 61643-11 and EN 61643-11 standards. It is designed for indoor use (IP20) and should be installed by qualified personnel according to local regulations.