DEHN BCO ML2 BD 24 Modular Combined Arrester for 1 Pair, 24 V DC, Screw Terminals 927244

Telecommunication and data lines are often exposed to transient overvoltages caused by lightning strikes or switching operations. The DEHN BCO ML2 BD 24 is a modular combined arrester designed to protect a single balanced pair (2-pole) in 24 V DC systems, ensuring reliable operation of connected equipment.

Who is it for

This surge protective device is intended for installers, system integrators, and maintenance personnel who need to safeguard telecommunication interfaces, data lines, or signal circuits in industrial or commercial environments. It is suitable for junction box mounting or DIN rail installation with an adapter.

Main features

• Protects one balanced pair (2-pole) for data or signal lines.
• Nominal voltage 24 V DC, maximum continuous operating voltage 28 V DC.
• High discharge capacity: nominal discharge current 1 kA per line (8/20 µs), total 2 kA; impulse current 0.5 kA per line (10/350 µs), total 1 kA.
• Low voltage protection level: ≤ 60 V line-line and line-PG at nominal discharge current.
• Wide operating temperature range from -40 °C to +80 °C.
• Screw terminals for secure connection.
• Housing made of UV-resistant thermoplastic.
• Compliant with IEC 61643-21 / EN 61643-21.

Specifications

• Product type: Combined arrester (SPD)
• Application: Telecommunication interfaces / data lines
• Number of protected pairs: 1 (2-pole)
• Nominal voltage (Un): 24 V DC
• Max. continuous operating voltage (Uc): 28 V DC
• Nominal discharge current (In) (8/20 µs) per line: 1 kA
• Total nominal discharge current (In) (8/20 µs): 2 kA
• Impulse current (Iimp) (10/350 µs) per line: 0.5 kA
• Total impulse current (Iimp) (10/350 µs): 1 kA
• Voltage protection level (Up) line-line at In: ≤ 60 V
• Voltage protection level (Up) line-PG at In: ≤ 60 V
• Cut-off frequency (fG) (50 Ω): > 10 MHz
• Operating temperature range: -40 °C to +80 °C
• Connection type: Screw terminals
• Mounting type: Junction box / DIN rail (with adapter)
• Housing material: Thermoplastic, UV resistant
• Protection class: IP65 (when installed in appropriate housing)
• Standards compliance: IEC 61643-21 / EN 61643-21

Tips

For optimal protection, install the arrester as close as possible to the equipment to be protected. Ensure proper grounding and follow the manufacturer's installation instructions. When used in outdoor applications, install in a suitable enclosure to achieve the specified IP rating.