theben SM 4 KNX 4-Way Switching and Dimming Actuator (4940310)

Description

Introduction

The theben SM 4 KNX (Item no. 4940310) is a 4-way switching and dimming actuator designed for mounting on standard DIN rails within KNX TP building automation systems. Engineered to control electrical consumers equipped with 0-10 V or 1-10 V analog interfaces, this actuator allows flexible management of both control and relay outputs across four independent channels. This device is part of our KNX system components range.

Operating on a mains voltage range of 110 V AC to 240 V AC at 50 Hz to 60 Hz, the unit features an extremely low standby consumption of approximately 0.5 W and draws under 10 mA from the KNX bus line. With a Class II protection rating and the capacity to handle peak inrush currents up to 800 A for 200 µs, it offers high reliability for modern electrical installations.

Key Features

• 4 independent control channels for 0-10 V or 1-10 V interfaces.
• Operates on KNX TP bus voltage with current draw < 10 mA.
• Supports mains supply voltages from 110 V AC to 240 V AC (50-60 Hz).
• Switching capacity supports up to 1200 for incandescent/halogen lamps and up to 600 W for LED loads.
• Contact rating configurations for 10 A and 3 A loads.
• Protection Class II compliance with DIN-rail installation type.

Benefits

• Enables flexible control of electrical consumers using standardized 0-10 V or 1-10 V control interfaces.
• Handles high peak inrush currents up to 800 A / 200 µs to prevent contact welding.
• Reduces operational energy costs with an economical standby power consumption of ~0.5 W.
• Provides broad wiring adaptability, accommodating solid wires up to 6 mm² and stranded wires with end sleeves up to 4 mm².
• Compact 4-module width DIN-rail mounting design maximizes panel space efficiency.

Technical Specifications

Specification	Value
Operating voltage KNX	Bus voltage, <10 mA
Operating voltage	110 V AC – 240 V AC, 50 Hz – 60 Hz
Frequency	50 – 60 Hz
Incandescent/halogen lamp load	1200
LED lamp < 2 W	55
LED lamp 2-8 W	600
LED lamp > 8 W	600
Inrush current	max. 800 A / 200 µs
Stand-by consumption	~0.5 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
Number of channels	4
Type of contact	10 A, 3 A
Protection class	II
Hand book	PDF
Information Notice EU Data Act	PDF
CE declaration of conformity	PDF
Data sheet	PDF
Installation type	DIN rail
Width	4
Opening width	< 3 mm

Applications

• Integration into KNX TP system networks requiring 0-10 V or 1-10 V analog dimming control.
• Centralized lighting and electrical consumer management in commercial and residential distribution boards.
• Lighting control installations with high inrush current characteristics such as LED driver loads.

Installation Notes

• Install on a standard 35 mm DIN rail inside a distribution panel ensuring Protection Class II integrity.
• Connect to the KNX TP bus system, ensuring bus power requirements (<10 mA) are factored into line load calculations.
• Observe maximum terminal wiring limits: solid wire 0.5 mm² to 6 mm² (Ø 0.8) or stranded wire with end sleeve 0.5 mm² to 4 mm².
• Verify the main supply voltage matches the specified operating range of 110 V AC – 240 V AC at 50-60 Hz.

Developer Resources

• Technical Data Sheet (PDF)
• Product Application Handbook (PDF)
• CE Declaration of Conformity (PDF)
• Information Notice EU Data Act (PDF)

FAQ

Which interface standards are controlled by the theben SM 4 KNX?

The SM 4 KNX actuator controls electrical consumers equipped with 0-10 V or 1-10 V analog control interfaces. Explore more theben building automation products for professional building automation projects.

What is the maximum peak inrush current supported by the switching outputs?

The device withstands a maximum peak inrush current of 800 A for up to 200 µs. For certificates and current technical files, refer to the manufacturer technical documentation.

What is the physical width of the device on a DIN rail?

The actuator occupies a width of 4 module units on a standard DIN rail.

What power is required from the KNX bus?

The actuator is powered via standard KNX bus voltage with a power consumption of less than 10 mA.

What is the exact product model?

The order/model code for this page is 4940310. Match it against project documents before purchase.

Who is the manufacturer?

This product is manufactured by theben.

Conclusion

The theben SM 4 KNX (4940310) provides a versatile, efficient solution for 4-channel switching and 0-10 V / 1-10 V dimming control in KNX system applications. Featuring low standby energy consumption and high inrush load resilience, it is ideally suited for modern commercial and residential automation distribution panels. Installers and system integrators can review our KNX dealer program options.