DEHN + SOEHNE BLITZDUCTOR XT BXT ML4 BD 24 Combined Arrester Module 920344

The DEHN + SOEHNE BLITZDUCTOR XT BXT ML4 BD 24 stands apart from conventional surge protectors by integrating lightning and surge protection into a single pluggable module, purpose-built for 4-wire balanced data interfaces like RS 485, PROFIBUS DP, and KNX. Unlike generic SPDs, it delivers precise voltage limiting without compromising signal integrity, thanks to its low series resistance and high cut-off frequency.

Highlights

• Combined lightning and surge protection for 4-wire balanced data systems
• Nominal voltage 24 V DC, max continuous operating voltage 28 V DC
• High discharge capacity: 10 kA per line (8/20 µs), 20 kA total
• Low voltage protection level: ≤150 V line-line, ≤500 V line-PG
• Wide operating temperature range: -40 °C to +80 °C
• Pluggable module for BXT BAS base part with screw terminals

In daily use

Installed on a BXT BAS base part, the BXT ML4 BD 24 protects sensitive bus systems from transient overvoltages without interrupting data flow. Its >10 MHz cut-off frequency and <100 pF capacitance ensure transparent signal transmission, while the 0.8 Ohm series resistance minimizes insertion loss. The module's pluggable design allows quick replacement during maintenance, reducing downtime in industrial and building automation environments.

Full specifications

• Product type: Combined arrester module
• Number of protected conductors: 4
• Nominal voltage (UN): 24 V DC
• Max. continuous operating voltage (UC): 28 V DC
• Nominal discharge current (In) line-line: 10 kA (8/20 µs)
• Nominal discharge current (In) line-PG: 10 kA (8/20 µs)
• Total discharge current (Itotal): 20 kA (8/20 µs)
• Voltage protection level (UP) line-line: ≤150 V at In
• Voltage protection level (UP) line-PG: ≤500 V at In
• Cut-off frequency (fg) line-line: >10 MHz
• Series resistance per line: 0.8 Ohm
• Capacitance per line: <100 pF
• Operating temperature range: -40 °C to +80 °C
• Connection type: Screw terminals (requires BXT BAS base part)
• Mounting type: Pluggable module
• Protection degree: IP20 (with base part)
• Standards compliance: IEC 61643-21, EN 61643-21

Final note

For reliable protection of balanced data lines in harsh industrial environments, the DEHN + SOEHNE BXT ML4 BD 24 delivers proven performance and easy serviceability.