Description
Introduction
The theben HMT 6 S KNX (Item no. 4900373) is a dedicated heating actuator engineered for the precise control of up to 6 heating circuits equipped with thermal actuators. Operating on a main voltage of 230 V AC – 240 V AC (50 – 60 Hz) along with a KNX bus connection (≤10 mA), this device offers flexible control options including switching 24 V DC or permanent 0–10 V DC output signals. This device is part of our KNX Actuators range.

Designed for high efficiency in HVAC automation, the actuator integrates up to 2 heating circuit pumps and adapts the flow temperature to current heating requirements. By automatically calculating the maximum actuating value, the device aligns system performance with actual demand to maintain optimal energy usage in KNX building control systems.
Key Features
- 6 independent control channels for thermal actuators.
- Dual control signal modes: 24 V DC switching or continuous 0–10 V DC.
- Integration support for up to 2 heating circuit pumps.
- Operating voltage range of 230 V AC – 240 V AC at 50 – 60 Hz.
- KNX bus operating voltage with current consumption of ≤10 mA.
- Wall-mounted design with spring terminal connection points.
- Designed for ambient operating temperatures between -5°C and 50°C.
Benefits
- Controls up to 6 independent heating circuits using thermal actuators.
- Provides versatile control options with 24 V DC switching or permanent 0–10 V DC output.
- Enables seamless integration of up to 2 heating circuit pumps.
- Improves energy efficiency via automatic calculation of the maximum actuating value.
- Features low standby power consumption of ≤1 W.
- Quick and secure wall installation using convenient spring terminals.
- Class II protection class according to EN 60 730-1 with an IP 20 protection rating.
Technical Specifications
Applications
- Multi-channel heating circuit management utilizing thermal actuators in KNX installations.
- Demand-based flow temperature adjustment and pump integration for HVAC automation.
- Building control projects requiring either 24 V DC switching or 0–10 V DC actuating signals.
Installation Notes
- Designed specifically for wall installation in environments between -5°C and 50°C.
- Connect wiring securely using the provided spring terminals.
- Ensure correct supply voltage of 230 V AC – 240 V AC (50 – 60 Hz) and standard KNX bus connection during installation.
Developer Resources
- Data sheet (PDF)
- Operating instructions and Hand book (PDF)
- KNX Database files for single product and all products (ZIP)
- CE Declaration of Conformity and Information Notice EU Data Act (PDF)
FAQ
How many channels does the theben HMT 6 S KNX actuator provide?
The device features 6 channels to control up to 6 heating circuits with thermal actuators. Explore more theben KNX products for professional building automation projects.
What output types are available for controlling heating circuits?
It supports switching 24 V DC or permanent 0–10 V DC output control. For certificates and current technical files, refer to the official product documentation.
Does this actuator support pump integration?
Yes, it allows integration of up to 2 heating circuit pumps.
What are the power requirements for this actuator?
It operates on 230 V AC – 240 V AC (50 – 60 Hz) power supply alongside KNX bus voltage (≤10 mA).
What is the exact product model?
The order/model code for this page is 4900373. Match it against project documents before purchase.
Who is the manufacturer?
This product is manufactured by theben.
Conclusion
The theben HMT 6 S KNX (4900373) heating actuator is a robust solution for controlling 6 heating circuits via 24 V DC switching or continuous 0–10 V DC outputs. With features like pump integration, energy-focused actuating value calculations, and low standby power consumption, it provides reliable climate control performance for KNX building automation projects. Installers and system integrators can review our KNX dealer program options.








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