FUCHSBERG ELECTRIC GMBH Surge Protection Device HSA 255 TNC 7.5 for Busbar Mounting, 1-Pole, Type 2 SPD, 255 V AC 556612

This surge protection device is engineered for direct busbar mounting in TN-C systems, offering a compact 1-pole solution that integrates seamlessly into distribution boards without additional wiring. Unlike typical DIN-rail devices, it clamps directly onto 10x3 mm to 30x5 mm busbars, saving space and simplifying installation.

Highlights

• Type 2 surge protection for TN-C networks
• Busbar mounting (10x3 mm to 30x5 mm)
• Nominal discharge current 20 kA, max 40 kA
• Voltage protection level < 1.5 kV
• Visual status indication (green/red)

In daily use

The HSA 255 TNC 7.5 provides reliable protection against transient overvoltages in industrial and commercial installations. Its thermal disconnector ensures safe isolation in case of overload, while the clear visual indicator allows quick status checks during routine maintenance.

Full specifications

• Product type: Surge Protection Device (SPD)
• SPD class: Type 2 (T2) / Class II
• System configuration: TN-C
• Mounting type: Busbar mounting
• Nominal voltage (Un): 230 V AC
• Maximum continuous operating voltage (Uc): 255 V AC
• Nominal discharge current (In) (8/20 µs): 20 kA
• Maximum discharge current (Imax) (8/20 µs): 40 kA
• Voltage protection level (Up) at In: < 1.5 kV
• Response time (tA): < 25 ns
• Integrated thermal disconnector: Yes
• Status indication: Visual (Green/Red)
• Degree of protection: IP20
• Operating temperature range: -40°C to +80°C
• Busbar compatibility: 10x3 mm to 30x5 mm
• Number of poles: 1-pole
• Short-circuit withstand capability (Isccr): 50 kA

Final note

Designed for reliable surge protection in busbar-based distribution systems, this SPD meets IEC 61643-11 and EN 61643-11 standards.