theben KNX-OT-Box S OpenTherm Interface 8559201

Description

Introduction

The theben KNX-OT-Box S (Item no. 8559201) is a specialized DIN rail interface designed to bridge OpenTherm heating boilers with KNX building system technology. By establishing a communication link between heating/ventilation systems and KNX building automation, this device allows system integrators to incorporate HVAC boiler management directly into central and individual room control networks. This device is part of our KNX automation components range.

With support for bidirectional data exchange, the KNX-OT-Box S enables optimized heat distribution across the KNX network. Furthermore, when combined with the OT-Box (9070712) from the RAMSES 856 top2 OT (8569132) series, it extends digital control capability even to heating systems that lack a native OpenTherm interface.

Key Features

• Bidirectional communication interface between OpenTherm bus systems and KNX networks.
• Powered via KNX bus line with ≤10 mA operating current.
• Standard DIN rail mounting with a width of 4 modules.
• Rated impulse withstand voltage of 4 kV.
• Protection class III and IP 20 protection type.
• Designed for operating ambient temperatures between 0°C and 45°C.

Benefits

• Facilitates seamless bidirectional data exchange between OpenTherm heating boilers and KNX building system technology.
• Optimizes heat distribution by linking individual KNX room control demand with central boiler management.
• Supports integration of boilers without a native OpenTherm interface when combined with the RAMSES 856 top2 OT (8569132) OT-Box (9070712).
• Operates efficiently on KNX bus voltage with a low current consumption of ≤10 mA.
• Standard 4-module width DIN rail design ensures quick mounting in standard electrical distribution boards.

Technical Specifications

Specification	Value
Operating Voltage KNX	Bus voltage, ≤10 mA
Rated Impulse Withstand Voltage	4 kV
Width	4
Installation Type	DIN rail
Ambient Temperature	0°C … 45°C
Operating Instructions	PDF
Protection Class	III
Handbook	PDF
Information Notice EU Data Act	PDF
CE Declaration of Conformity	PDF
Data Sheet	PDF
Type of Protection	IP 20
KNX-Database (Single Product)	ZIP
CAD Symbol	ZIP
KNX-Database (All Products)	ZIP

Applications

• Interfacing OpenTherm heating boilers with KNX building automation networks for individual room heat control.
• Integrating central heat supply units into smart building management and heat distribution systems.
• Adapting non-OpenTherm heating boilers for KNX control using the OT-Box (9070712) and RAMSES 856 top2 OT (8569132).

Installation Notes

• Mount on a standard DIN rail inside an electrical control cabinet to maintain IP 20 protection.
• Connect directly to the KNX bus line, which provides operating power (≤10 mA current draw).
• Ensure the operating environment remains within the specified temperature range of 0°C to 45°C.

Developer Resources

• KNX Database files (Single Product and All Products ZIP) available for ETS system integration and project configuration.
• CAD Symbol ZIP files, PDF Data Sheet, Operating Instructions, Handbook, CE Declaration of Conformity, and EU Data Act Notice available for project design and compliance verification.

FAQ

What is the primary function of the theben KNX-OT-Box S (8559201)?

It acts as an interface allowing bidirectional data exchange between OpenTherm boilers and KNX systems for individual room control and central heat distribution. Explore more theben building automation products for professional building automation projects.

How is the KNX-OT-Box S powered?

The module operates on standard KNX bus voltage with a current consumption of ≤10 mA. For certificates and current technical files, refer to the official product documentation.

Can boilers without an OpenTherm interface be connected?

Yes, non-OpenTherm heating boilers can be controlled when the unit is used in combination with the OT-Box (9070712) from the RAMSES 856 top2 OT (8569132) system.

What physical form factor and protection rating does the unit have?

It is a 4-module wide DIN rail device with Protection Class III and an IP 20 protection rating.

What is the exact product model?

The order/model code for this page is 8559201. Match it against project documents before purchase.

Who is the manufacturer?

This product is manufactured by theben.

Conclusion

The theben KNX-OT-Box S (8559201) delivers efficient, reliable bridging between OpenTherm heating boilers and KNX automation networks. With its compact 4-module DIN rail design, low bus power usage, and integration options for non-OpenTherm systems, it provides a solid hardware foundation for intelligent heat distribution. Installers and system integrators can review our KNX dealer program options.