FUCHSBERG ELECTRIC Type 2 Surge Protection Device HSA 255 TT12.5 U for Busbar System, 4-Pole, 230/400 V AC, 40 kA 556722

Protect your electrical installation from transient overvoltages caused by lightning strikes or switching operations. The FUCHSBERG ELECTRIC HSA 255 TT12.5 U is a Type 2 surge protection device designed for TT earthing systems, built to safeguard equipment connected to busbar systems.

Who is it for

This SPD is intended for electricians and panel builders who need reliable surge protection in low-voltage distribution boards. It suits commercial and industrial environments where busbar mounting is standard and where remote monitoring of protection status is required.

Main features

• Type 2 surge protection device according to EN 61643-11
• Designed for TT earthing systems
• Nominal voltage 230/400 V AC, maximum continuous operating voltage 255 V AC
• High discharge capacity: nominal 20 kA, maximum 40 kA (8/20 µs)
• Low voltage protection level ≤ 1.2 kV, fast response < 25 ns
• 4-pole configuration (3+1) with varistor technology
• Visual status indication (green/red flag) and remote signaling via potential-free changeover contact
• Mounts directly on busbar system (Sammelschiene)
• Operating temperature range -40 °C to +80 °C, IP20 protection

Specifications

• Product type: Surge Protection Device (SPD)
• SPD type: Type 2
• Earthing system: TT
• Nominal voltage (Un): 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 (tA): < 25 ns
• Mounting type: Busbar system
• Number of poles: 4 (3+1)
• Protection mode: L-N, N-PE
• Protection technology: Varistor (MOV)
• Status indication: Visual (green/red flag)
• Remote signaling: Yes (potential-free changeover contact)
• Degree of protection: IP20
• Operating temperature range: -40 °C to +80 °C
• Housing material: Thermoplastic
• Standards compliance: IEC 61643-11, EN 61643-11

Tips

Ensure the device is installed by a qualified electrician and that the busbar system is de-energized during installation. Periodically check the status indication to confirm the protection is active.