DEHN ylijännitesuoja tyyppi 1 4-napainen BXT ML4 BD HF 5

This Type 1+2 surge arrester provides lightning and surge protection for 230/400 V AC power systems, featuring spark gap technology and a 4-pole (3+1) configuration for TN-S and TT systems.

Advantages

Combined Type 1 and Type 2 protection in one device, high lightning impulse current discharge capability of 25 kA per pole (10/350 µs), and follow current extinguishing capability up to 100 kA rms ensure reliable protection for critical installations.

Suitable for

• Main distribution boards in residential and commercial buildings
• Industrial power supply systems requiring lightning equipotential bonding
• TN-S and TT earthing systems

Key specifications

• Nominal voltage: 230/400 V AC
• Max. continuous operating voltage: 255 V AC
• Lightning impulse current (10/350 µs): 25 kA per pole, 100 kA total
• Nominal discharge current (8/20 µs): 20 kA per pole
• Voltage protection level: ≤ 1.5 kV
• Mounting: 35 mm DIN rail
• Degree of protection: IP20
• Operating temperature: -40 °C to +80 °C

Recommendations

Install at the service entrance to protect downstream equipment from direct lightning strikes and switching surges.