Fermax LOFT BUS2 Extra Audio Telephone Handset

Fermax F-3397 LOFT BUS2 Extra Audio Telephone Handset

The Fermax F-3397 is the Extra variant of the LOFT BUS2 audio door entry telephone, designed for use with Fermax BUS2 two-wire digital systems. In addition to the standard lock release and concierge call functions, the Extra model includes two installer-assignable supplementary function buttons (F1 and F2) rated at 50 mA at 12 Vdc. The handset features two selectable call tones, a three-position volume switch, LED call indicator, and electret microphone.

Key Features

• BUS2 two-wire digital bus compatible (non-polarity)
• Two selectable call tones
• Three-position volume switch (Off / Medium / High)
• LED call indicator
• Door release activation during conversation
• Concierge/guard unit call function (system dependent)
• Two supplementary function buttons (F1, F2) — installer assignable
• F1/F2 output: negative output, max 50 mA at 12 Vdc
• Apartment door bell push button connection (P1 terminals T, -)
• Programming via dedicated button
• Electret microphone
• Max call ring duration: 30 seconds
• Max conversation time: 90 seconds

Technical Specifications

• Supply voltage: 24 Vdc
• Current draw (standby): 20 mA
• Current draw (ringing): 315 mA
• Current draw (audio active): 290 mA
• Operating temperature: 0 to +40 degrees C
• Electronic call signal: 8 to 12 Vpp
• Speaker: 1.75 inch, 16 ohm
• Microphone: Electret
• Dynamic resistance: 50 ohm
• Bus type: BUS-2
• F1/F2 max current: 50 mA at 12 Vdc