FUCHSBERG ELECTRIC Type 2 Surge Arrester HSA 255 TNC 7.5 for Busbar Mounting, 3-Pole + PEN, 255 V AC, 40 kA Imax, Plug-in Module 556610

With a maximum discharge current of 40 kA and a voltage protection level below 1.5 kV, the FUCHSBERG ELECTRIC HSA 255 TNC 7.5 surge arrester provides robust protection for TN-C networks. This Type 2 SPD is engineered for busbar mounting in main and sub-distribution boards, offering reliable defense against transient overvoltages.

Overview

The HSA 255 TNC 7.5 is a 3-pole + PEN surge protective device designed for TN-C network configurations. It features a nominal voltage of 230/400 V AC and a maximum continuous operating voltage of 255 V AC, making it suitable for standard low-voltage installations. The integrated thermal disconnector and optical status indication ensure safe operation and easy monitoring.

What stands out

• High discharge capacity: 20 kA nominal and 40 kA maximum discharge current (8/20 µs)
• Fast response time of less than 25 ns
• Plug-in module design for quick replacement without disconnecting wiring
• Compact busbar mounting on 12x5 mm or 12x10 mm busbars
• Wide operating temperature range from -40°C to +80°C

Technical details

• SPD Type: Type 2
• Network Configuration: TN-C
• Nominal Voltage (Un): 230/400 V AC
• Max Continuous Operating Voltage (Uc): 255 V AC
• Nominal Discharge Current (In) (8/20 µs): 20 kA
• Max Discharge Current (Imax) (8/20 µs): 40 kA
• Voltage Protection Level (Up): < 1.5 kV
• Response Time (tA): < 25 ns
• Number of Poles: 3-pole + PEN
• Mounting Type: Busbar (12x5 mm or 12x10 mm)
• Protection Class (IP): IP20
• Operating Temperature Range: -40°C to +80°C
• Status Indication: Optical (Green/Red)
• Housing Material: Thermoplastic
• Disconnector: Integrated thermal disconnector
• Connection Type: Plug-in module for base part
• Application: Main distribution boards, sub-distribution boards
• Energy Coordination: With Type 1 and Type 3 SPDs

Our verdict

For electricians and panel builders seeking a reliable Type 2 surge arrester for TN-C systems, the HSA 255 TNC 7.5 delivers high discharge capacity and easy maintenance in a compact busbar-mounted design.