GIRA 519400 KNX Secure Push-button Interface 4-gang Comfort

Where conventional binary inputs stop at relaying contact states, the GIRA 519400 raises the bar with native KNX Secure encryption on every telegram. This 4-gang comfort interface reads potential-free contacts and converts them into protected bus signals, making it the go-to module for security-conscious KNX projects that still demand full functional flexibility.

Highlights

• KNX Secure protocol support for encrypted communication on the bus
• Four independent inputs for potential-free contacts (switches, push-buttons, relays)
• Per-input configurable functions: switching, dimming, blind control, value transmitter, scene recall, counter, and temperature sensing with external NTC
• Integrated logic functions including AND, OR, XOR, time delays, and scene storage
• Flush-mounted in a standard device box – ideal for retrofits and new builds
• Powered directly from the KNX bus; no auxiliary supply needed

In daily use

Installers will appreciate how quickly the 519400 integrates into existing KNX topologies. Each input can be assigned a different function, so one module can handle a light switch, a blind control, a temperature sensor, and a scene recall simultaneously. The built-in logic engine reduces the need for additional devices, saving both space and commissioning time. Because the module is KNX Secure certified, all telegrams are encrypted end-to-end, making it suitable for buildings with high security requirements such as offices, public institutions, and smart homes.

Full specifications

• Product Type: KNX Binary Input Module / Push-button Interface
• Number of Inputs: 4
• Input Type: Potential-free contacts
• KNX Protocol Support: KNX Secure
• Mounting Type: Flush-mounted in standard device box
• Power Supply: Via KNX bus
• Configurable Functions per Input: Switching, Dimming, Blind Control, Value Transmitter (1/2/4-byte), Scene Recall, Counter, Temperature Sensor (with external NTC)
• Integrated Logic Functions: Yes (AND, OR, XOR, time functions, scene functions)
• Input Cable Length: Up to 10 meters per input
• Operating Voltage (Inputs): Max. 3.3 V DC (internal)
• Operating Temperature: -5 °C to +45 °C
• Protection Class: IP20
• Bus Connection: KNX Bus Terminal (red/black)
• Configuration Software: ETS (Engineering Tool Software) version 5.7 or higher
• Firmware Update: Yes, via ETS
• LED Indicators: Programming mode, status
• Material: Plastic

Final note

For installers and system integrators who refuse to compromise between security and versatility, the GIRA 519400 delivers both in one flush-mounted unit.