DEHN BXT ML2 BDHFS5 Combined Lightning Current and Surge Arrester Module 920271

The DEHN BXT ML2 BDHFS5 920271 combines Type 1 and Type 2 surge protection in a single compact module, eliminating the need for separate lightning current and surge arresters. Its 5 kA lightning impulse current rating per pole and 50 kA maximum discharge current make it suitable for demanding applications where space is limited but performance cannot be compromised.

Highlights

• Combined Type 1 + Type 2 / Class I + II arrester for TN-S and TT systems
• Lightning impulse current (Iimp) of 5 kA per pole (10/350 µs)
• Maximum discharge current (Imax) of 50 kA (8/20 µs)
• Voltage protection level ≤ 1.5 kV for effective equipment protection
• Compact 1-module design for 35 mm DIN rail mounting
• Optical status indication with green/red flag

In daily use

This module is engineered for reliable protection in low-voltage power distribution systems. With a nominal voltage of 230/400 V AC and a maximum continuous operating voltage of 255 V AC, it handles standard mains conditions. The response time of less than 100 ns ensures fast reaction to transients, while the 315 A gG maximum backup fuse allows flexible integration. The red thermoplastic housing meets UL 94 V-0 and operates from -40 °C to +80 °C.

Full specifications

• Arrester type: Combined lightning current and surge arrester
• SPD class: Type 1 + Type 2 / Class I + II
• 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): 50 kA
• Lightning impulse current (Iimp) (10/350 µs): 5 kA per pole
• Voltage protection level (Up): ≤ 1.5 kV
• Response time (tA): < 100 ns
• Protection modes: L-N, N-PE
• System configuration: TN-S, TT
• Mounting type: 35 mm DIN rail
• Number of modules (TE): 1
• Short-circuit withstand capability (Isccr): 50 kA rms
• Max backup fuse: 315 A gG
• Operating temperature range: -40 °C to +80 °C
• Degree of protection: IP20
• Status indication: Optical (green/red flag)
• Housing material: Thermoplastic, red, UL 94 V-0

Final note

With its high discharge capacity and compact footprint, the BXT ML2 BDHFS5 is a robust choice for protecting electrical installations against both direct lightning strikes and switching surges.