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

Six a/b Switching Modules suitable for use with TFS-Dialog 200/300/400 or TFS-Universal plus, requiring only a two-core cable

Each button can control one or more switching modules, assignment programmable

Your advantages in detail

If you want to switch on lights when a (doorbell) key is pressed, control your existing door bell, or inform your intrusion detection system about visitors at the door, then you need additional switch contacts.

As an exclusive connection option, you may use a/b Switching Modules which can easily be switched to any location on the signal line between the door terminal system and ICT system, and initiate the switching operation when a key is pressed.

Features & technical data

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Supply connection

ICT system analogue port

Technical Data



Operating voltage via door bell transformer

8 V – 18 V AC / 24 V DC

Contact load capacity

0.5 A

Switching frequency

6 channels in the range 20 kHz – 50 kHz, 100 mV


200 m


45 mm x 35 mm x 10 mm


30 g

Delivery Scope

  • a/b Switching Module
  • Resistance (for activation of an electronic gong)

Top Sellers

Sales Configurator (SC)

- the easy way to the right system

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)