ITR900-0164 Interra KNX Power Supply 640 mA: Bus Voltage Generation with Auxiliary Output
A crucial feature is the integrated choke, which ensures the bus line is properly decoupled from the power supply for clean data communication. Uniquely, this model includes an additional 30 V DC short-circuit and overload protected voltage output that can be used to power a second bus line (in combination with a separate choke) or serve as a constant 30 V DC supply.
Designed for worldwide compatibility, it accepts a wide-range mains input (85…265 V AC, 50/60 Hz). The device ensures system safety with overload, short-circuit, and over-temperature protection. The two-color LED (Green/Red) provides clear visual feedback on the device’s output status.
1. ITR900-0164 Interra KNX Power Supply: Key Features and Dual Output
Reliable power generation and advanced safety features for robust KNX system operation.
Technical Specifications:
- Product Code: ITR900-0164.
- Nominal Current Output: 640 mA total nominal current.
- Nominal Voltage: 30V DC (Bus Voltage – SELV).
- Power Consumption (Typical/Max): 24 W / 55 W.
- Protection Type: IP20.
Core Features:
- Dual Output Capability: Provides the main KNX bus output (with integrated choke) and an additional 30 V DC output for auxiliary power or a second bus line (requires external choke).
- Bus Decoupling: Integrated choke separates the data bus from the power line.
- Safety: Output is protected against overload, short-circuit, and over-temperature.
- Global Use: Features a wide-range mains input (85…265 V AC).
- Status Indication: Two-color LED (Green/Red/Flashing Red) indicates output status (OK, Overload, Short Circuit).
2. System Role and Installation
This power supply is critical for large-scale and multi-line KNX installations.
- Installation: DIN rail mounting, requiring approximately 4 standard modules width.
- Function: The additional 30 V DC output simplifies powering devices on separate segments or external components.










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