TFS-Dialog 400 series

Elegantly designed door intercom system for maximum operating comfort

Operation on the analogue extension connection of an ICT system from the own or other brands

1 – 4 doorbell buttons (free configurable)

Code lock function

Programming of numbers and functions via app (Android und iOS)

Name plate illumination without additional power supply

Your advantages in detail

The TFS-Dialog 400 door terminal system with its elegant glass panel and indirect lighting isn’t just attractive – it also sets new standards in functionality. The number of doorbell buttons can be set from 1 to 4 and the TFS-Dialog 400 even offers a convenient code lock function. Best of all, the system is easy to configure using an app from an Android or iOS device.

The TFS-Dialog 400 is connected directly to an analogue subscriber port on your ICT system by means of a 2-core cable and behaves like a telephone: when the doorbell button is pressed, an internal or external phone number is dialled.

Compatible products

Features & technical data

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  • Operation on analogue subscriber ports of a branded or other PBX system
  • High quality housing with noble glass panel
  • 1 to 4 doorbell buttons (freely configurable), optional usable as light key
  • Code lock function
  • Name plate illumination with maintenance-free LED technology, without additional power supply
  • Indirect ambient light (doorbell transformer required)
  • Programming of the door terminal via app (iOS and Android)
  • Two levels of sensitivity for noisy and quiet environments
  • Switching contacts for door opener, doorbell and light (doorbell transformer required)
  • Intelligent door open detection with call break
  • Additional switching possibilities with optional a/b Switching Modules
  • Excellent speech audibility frequency-optimised amplifier electronics
  • Compact construction with only 28 mm height
  • Maintenance-free sensor keys
  • Front screen made of 6 mm shatterproof glass, 6 mm thick

Product variants

  • 90061 / TFS-Dialog 400, black
  • 90167 / TFS-Dialog 400, white
  • 90168 / TFS-Dialog 400, anthracite



Interface, supply connection

analogue subscriber port / extension of the PBX

Dial mode

Tone dialling (DTMF)

Operating voltage from analogue port

16 – 60 V DC (lighting powered via doorbell transformer) or
19 – 60 V DC (lighting powered via analogue port)

Operating voltage from doorbell transformer (optional)

8 V – 12 V AC, 40 mA (for outputs and LED lighting)

Power consumption for LED lighting (doorbell transformer)

35 mA – 40 mA

Loop power, depending on operation mode

<1 mA / 20 mA – 60 mA

Maximum load door opener

12 V AC / 40 V DC, 2 A

Maximum load doorbell and lighting output

12 V AC / 40 V DC, 1 A


Ø 50 mm

Temperature range

-20 °C – +50 °C


glass (front panel) / plastic (subshell)

Dimensions (w x h x d)

140 mm x 220 mm x 28 mm


approx. 680 g





Delivery Scope

  • Door terminal TFS-Dialog 400
  • Connection and user manual
  • Labelling foil
  • Socket wrench


a/b Switching Module

Switching module for door bell, door opener and light system control via 2-wire analogue line, for TFS-Dialog 200/300/400 and TFS-Universal plus


Overvoltage protection module for effective protection of traditional telecommunications connections

Top Sellers

Sales Configurator (SC)

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Customer requirements for communication solutions are constantly increasing and with them the complexity and scalability of ITC systems. Project planning therefore takes up more and more time. Here, the free Sales Configurator offers a simple and fast solution. It gives you the opportunity to efficiently plan communication solutions and create project planning proposals.

Sales Configurator (SC)