DEHN 918422 BLITZDUCTOR VT Combined Lightning Current and Surge Arrester for DC Power Supply Systems, 24 V DC, Type 1+2 SPD

Protect DC power supply systems from lightning currents and surges with the DEHN 918422 BLITZDUCTOR VT. This combined lightning current and surge arrester is engineered for 24 V DC applications, diverting dangerous transient overvoltages to ground and preventing damage to sensitive equipment. With a nominal discharge current of 10 kA (8/20 µs) and a lightning impulse current of 2.5 kA (10/350 µs) per line, it offers robust protection for two-wire DC lines. The low voltage protection level of ≤150 V at In ensures that connected devices see minimal residual voltage. Designed for DIN rail mounting, it features screw terminals for secure wiring and operates reliably from -40 °C to +80 °C. The thermoplastic flame-retardant housing provides durability, while the gas discharge tube and varistor/diode technology delivers a response time of less than 1 ns. Compliant with IEC 61643-21 and EN 61643-21, this arrester is a dependable choice for industrial and commercial DC power distribution.

Who is it for

This arrester is ideal for electrical engineers, panel builders, and facility managers who need to safeguard DC power supply systems in industrial environments, telecommunications, or renewable energy installations. It suits applications where 24 V DC circuits are exposed to lightning-induced surges or switching transients.

Main features

• Combined lightning current and surge arrester for DC power supply systems
• Nominal voltage: 24 V DC, max. continuous operating voltage: 28 V DC
• High discharge capacity: In 10 kA (8/20 µs), Itotal 20 kA, Iimp 2.5 kA per line (10/350 µs)
• Low voltage protection level: ≤150 V at In, ≤100 V at 1 kV/µs
• Fast response time: <1 ns
• Series resistance per line: <0.5 Ω
• Wide operating temperature range: -40 °C to +80 °C
• Protection degree: IP20
• Mounts on 35 mm DIN rail, screw terminal connection
• Protects 2 wires (e.g., L+/L- to PE)
• Housing: flame-retardant thermoplastic
• Complies with IEC 61643-21 and EN 61643-21

Specifications

• Product type: Combined lightning current and surge arrester
• Application: DC power supply systems
• Nominal voltage (UN): 24 V DC
• Max. continuous operating voltage (UC): 28 V DC
• Nominal discharge current (In) (8/20 µs): 10 kA
• Total discharge current (Itotal) (8/20 µs): 20 kA
• Lightning impulse current (Iimp) (10/350 µs) per line: 2.5 kA
• Voltage protection level (UP) at In: ≤150 V
• Voltage protection level (UP) at 1 kV/µs: ≤100 V
• Series resistance per line: <0.5 Ω
• Operating temperature range: -40 °C to +80 °C
• Protection degree: IP20
• Mounting type: 35 mm DIN rail
• Connection type: Screw terminals
• Number of protected wires: 2
• Protection technology: Gas discharge tube (GDT) and varistor/diode combination
• Standards compliance: IEC 61643-21, EN 61643-21
• Housing material: Thermoplastic, flame-retardant
• Response time: <1 ns

Tips

Install the BLITZDUCTOR VT as close as possible to the power supply input of the equipment to be protected. Ensure proper grounding and use short, straight conductors to minimize let-through voltage. For optimal performance, coordinate with upstream and downstream surge protective devices according to the manufacturer's guidelines.