theben BM 12 T KNX 12-Way Binary Input Module (4940235)

Description

Introduction

The theben BM 12 T KNX (SKU 4940235) is a high-performance 12-way binary input module designed for modern KNX system components in building automation. Built in the FIX2 housing format, this device accepts 12 floating universal and wide-range voltage inputs spanning 10 to 240 V AC/DC, or an internally generated auxiliary voltage of approximately 12 V DC. This device is part of our KNX System Components products range.

Engineered for flexibility and efficiency, the BM 12 T KNX features a low standby power consumption of approximately 0.3 W and includes 4 additional channels operable directly via manual push buttons on the unit. Equipped with status LEDs for input signal monitoring, it delivers reliable status acquisition for KNX system integrators, consultants, and electrical installers.

Key Features

• 12 floating universal binary inputs supporting 10 V DC – 240 V AC (2 mA).
• Auxiliary output providing 12 V DC / 18 mA (SELV) for potential-free contacts.
• 4 extra manual channels operable directly by integrated device buttons.
• DIN rail installation with an 8-module width footprint.
• KNX bus power consumption rated at ≤4 mA on standard KNX bus voltage.
• IP 20 protection rating and Class II protection according to EN 60 730-1.
• Flexible cable connection supporting solid wire up to 6 mm² and stranded wire with end sleeve up to 4 mm².

Benefits

• Wide-range voltage compatibility from 10 V DC to 240 V AC provides maximum interfacing flexibility across various field devices.
• Low standby power consumption of approximately 0.3 W helps reduce operating energy requirements.
• Integrated SELV auxiliary output (12 V DC / 18 mA) allows convenient floating contact monitoring without external auxiliary supplies.
• Direct local operation via 4 manual buttons on the device facilitates quick functional testing without bus programming.
• Visual input monitoring via 12 dedicated status LEDs offers instant diagnostic feedback during commissioning and maintenance.

Technical Specifications

Specification	Value
Operating voltage KNX	Bus voltage, ≤4 mA
Operating voltage	110 V AC – 240 V AC, 50 Hz – 60 Hz
Frequency	50 – 60 Hz
Voltage inputs	10 V DC – 240 V AC 2 mA
Stand-by consumption	~0.3 W
Max. cable cross section	Solid wire: 0.5 mm² (Ø 0.8) to 6 mm² | Stranded wire with end sleeve: 0.5 mm² to 4 mm²
Output	12 V DC/18 mA, SELV
Display	12 LEDs for displaying the status at the input
Suitable for SELV	Yes, if all inputs are connected with SELV
Information Notice EU Data Act	PDF
CE declaration of conformity	PDF
Data sheet	PDF
Width	8
Max. cable length	100
Installation type	DIN rail
Protection class	II according to EN 60 730-1
Type of connection	KNX bus terminal
Ambient temperature	-5°C … 45°C
Operating instructions	PDF
Type of protection	IP 20

Applications

• Interfacing potential-free binary signals and high-voltage switches into KNX building management systems.
• Monitoring status inputs and contact signals across industrial or commercial KNX automation installations.
• DIN-rail electrical distribution boards requiring compact 12-channel binary signal acquisition.

Installation Notes

• Mount the unit on a standard DIN rail within a switchboard offering an IP 20 enclosure environment, maintaining ambient temperatures between -5°C and 45°C.
• Connect the device to the KNX bus line using a standard KNX bus terminal; ensure proper cable cross-sections (solid wire 0.5 to 6 mm², stranded wire 0.5 to 4 mm² with end sleeve).
• Note that SELV suitability requires all connected inputs to adhere to SELV voltage standards. Do not exceed the maximum input cable length of 100 meters.

Developer Resources

• Official data sheet PDF for technical specifications and dimensional drawings.
• CE declaration of conformity and operating instructions PDF for regulatory and setup compliance.
• EU Data Act information notice PDF.

FAQ

What is the input voltage range supported by the theben BM 12 T KNX?

The inputs accept wide-range voltages from 10 V DC up to 240 V AC (2 mA), or an internally generated auxiliary voltage of approximately 12 V DC. Explore more theben automation devices for professional building automation projects.

Does the module provide its own auxiliary voltage output?

Yes, it provides an auxiliary output of 12 V DC / 18 mA (SELV) for potential-free contact monitoring. For certificates and current technical files, refer to the official product documentation.

How many DIN rail modules wide is the BM 12 T KNX?

The device features a width of 8 DIN rail modules.

What is the standby power consumption of this binary input device?

The standby power consumption is approximately 0.3 W.

What is the exact product model?

The order/model code for this page is 4940235. Match it against project documents before purchase.

Who is the manufacturer?

This product is manufactured by theben.

Conclusion

The theben BM 12 T KNX (4940235) is an adaptable 12-channel binary input interface, combining wide voltage compatibility, low standby power, and auxiliary SELV output capability for professional KNX system deployments. Installers and system integrators can review our professional project support options.