The ABB UD/S6.210.2.1 KNX Universal Dimmer is a six-channel universal dimming actuator optimised for retrofit LED lamps (LEDi) in ABB i-bus® KNX projects. Six independent channels deliver up to 6 × 210 W/VA at 230 V~, with outputs combinable in parallel for a maximum of 1 × 800 W/VA on a single load — the highest channel count in the UD/S 210 W family.

Install on standard 35 mm DIN rail (MDRC). The module includes an integrated KNX bus coupler and supports commissioning with or without applied mains voltage.

Key Features and Dimming Capabilities

The UD/S6.210.2.1 consolidates six dimming circuits in one 8M MDRC position, reducing panel space when multiple independent lighting zones are required.

Universal Load Support

• 6 dimming channels: Independent control of six lighting circuits with separate N-connection per channel.
• LEDi optimised: Dimmable 230 V~ LEDi up to 6 × 210 W/VA (trailing edge) or 6 × 80 W/VA (leading edge); parallel up to 1 × 800 W/VA / 1 × 240 W/VA respectively.
• Legacy compatibility: Incandescent, 230 V halogen, low-voltage halogen (conventional L or electronic C transformers), and dimmable energy-saving lamps.
• Transformer loads: Inductive L-transformers and electronic C/LC-transformers with LED or LV halogen — see Technical Specifications for per-type limits.
• Minimum load: 2 W for stable dimming of low-power LED circuits.

Commissioning, Diagnostics, and Control

• Automatic load detection: Identifies connected load type automatically (can be deactivated).
• Parallel outputs: Channels can be connected in parallel in any configuration to increase output power.
• Manual operation: On-device control possible without bus voltage or in unprogrammed status.
• Safe programming: Device can be configured without applied 230 V supply voltage.
• ABB i-bus® Tool: Extensive test and diagnosis functions for field troubleshooting.
• ETS efficiency: Fast parameterisation using copyable channel templates.

At a Glance

Specification	Detail
Product type	Universal LED dimming actuator, 6-fold
Order code	UD/S6.210.2.1 (2CKA006197A0049)
Channels	6 independent dimming outputs
Nominal power (230 V~ LEDi, trailing edge)	6 × 210 W/VA → 1 × 800 W/VA parallel
Minimum load	2 W
Input voltage	110 … 230 V AC/DC, 50/60 Hz
Mounting	DIN rail MDRC, 8M (140 mm wide)
Protection	IP20
Bus system	KNX twisted pair (TP)

Full load-type ratings, dimensional data, and classification codes — including ETIM EC001094 and EAN 4011395251881 — are listed under Technical Specifications.

Applications and KNX Integration

• Multi-zone lighting panels: Six independent dimming circuits in one MDRC slot for offices, hotels, and residential distribution boards.
• LED retrofit projects: Stable trailing-edge dimming for modern 230 V~ LEDi across multiple rooms or floors from a single actuator.
• High-power zones: Parallel channel connection for large dining rooms, lobbies, or open-plan areas up to 800 W/VA.
• ETS configuration: Import the official .knxprod application (Downloads), assign group addresses, scenes, and daylight-linked control from KNX sensors such as the 6131/20-24-500 Presence Mini W.
• Project documentation: Product manual, connection diagram, dimensional drawing, CAD, and EPLAN data are available under Downloads.

Choosing UD/S Universal Dim Actuators

ABB offers the UD/S family in several channel counts and power ratings. The UD/S6.210.2.1 (6 × 210 W/VA) suits panels requiring the maximum number of independent dimming circuits in one position. For four standard circuits, choose UD/S4.210.2.1. For higher per-channel headroom with two outputs, choose UD/S4.315.2.1 (2 × 315 W/VA).