STEINEL KNX-S Universal Interface UI4, 4 Inputs, Flush-Mounted Installation, Bus-Powered 089238

The STEINEL UI4 KNX-S stands out as a compact universal interface that brings four independent binary inputs into the KNX bus system. Unlike simple switch actuators, each input can be configured for switching, dimming, blind control, scene recall, or even temperature sensing, making it a flexible building block for custom automation.

Highlights

• Four universal inputs accept potential-free contacts, push-buttons, switches, or temperature sensors
• Powered directly from the KNX bus (21-30V DC) with minimal current draw under 10 mA
• Flush-mounted design fits standard switch boxes for discreet installation
• Configured entirely with ETS software, no manual addressing or DIP switches
• Each input supports switching, dimming, blind control, value transmission, and scene recall

In daily use

Installers will appreciate the UI4's straightforward wiring: connect binary contacts or sensors to the four inputs, then assign functions in ETS. The device is designed for permanent installation in a wall box, keeping the installation clean and unobtrusive. With a maximum cable length of 5 meters per input, it suits most residential and commercial switch positions.

Full specifications

• Product type: Universal Interface
• System compatibility: KNX-S
• Number of inputs: 4
• Input type: Universal (binary contacts, push-buttons, switches, temperature sensors)
• Power supply: KNX Bus (21-30V DC)
• Current consumption: < 10 mA from bus
• Installation type: Flush-mounted
• Configuration software: ETS
• Functions per input: Switching, dimming, blind control, value transmitter, scene recall, temperature sensor input
• Bus connection: KNX bus terminal (red/black)
• Protection class: IP20
• Operating temperature: 0°C to +45°C
• Storage temperature: -20°C to +70°C
• Housing material: Plastic
• Max. cable length per input: 5 m
• Input voltage (binary): Max. 30V DC
• Input current (binary): Max. 1 mA
• Mounting: Standard flush-mount box (e.g., Ø 60 mm)

Final note

For KNX integrators seeking a compact, multi-function input module, the UI4 KNX-S offers reliable performance and straightforward commissioning.