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Signaling Device Interface Modules



Product Description

FLM‑420‑NAC Signaling Device Interface Modules make it possible to monitor and activate a group of signaling devices (NAC = Notification Appliance Circuit) in the Local Security Network LSN. Each interface module offers one monitored primary line. This means one signaling device line can be connected to LSN fire panels. The following can be connected: • Sounders • Strobes • Horns.

Additional information

Features and Benefits


Rotary switches for automatic or manual address setting
Control of signaling device line by pole reversal
Synchronized activation of all signaling devices connected to a LSN module via FLM‑420‑NAC Signaling Device Interface Module
Ten different output signals via LSN selectable
Maintains LSN loop functions in the event of wire interruption or short-circuit thanks to two integrated isolators
Available with surface-mounted housing or DIN rail adapter



Input voltage
15 V DC to 33 V DC

from LSN
6,06 mA (normal operation and alarm)

from external power supply
15 mA (normal operation) + output current

External power supply
20,4 V DC to 29 V DC

Max. output current
3 A (during an alarm, from ext. power supply)

EOL resistance
3.9 kΩ


Green LED
Normal operation

LSN/Address setting
3 rotary switches for
Mode LSN "classic" or LSN improved version