The Interra ITR501-0004 is a KNX universal dimming actuator with four independent channels, each rated up to 250 W for resistive and selected capacitive loads (up to 1000 W total across channels). It phase-controls R, L, and C load types — incandescent and halogen lamps, electronic and ferromagnetic low-voltage transformers, and dimmable LED retrofit and CFL lamps — with load type and presence detection configured in ETS.

Each channel has an RGB status LED, manual override, temperature and short-circuit protection, and error indication. The dimming curve can be split into five zones with separate dimming speeds. The module mounts on DIN rail (6 modular widths), accepts 230 V AC ±10 % / 50 Hz, and can be programmed on the KNX bus without mains voltage applied. Separate phase and neutral per channel support use on three-phase distribution.

Key Features — 4 × 250 W Universal Dimming

Outputs and Load Types

• 4 channels: 250 W per channel (incandescent / halogen); 200 W per channel in inductive dimming mode.
• LV halogen — ferromagnetic transformer: 200 VA per channel (capacitive mode not supported).
• LV halogen — electronic transformer: 250 VA per channel (inductive mode not supported).
• LED retrofit and dimmable CFL: Supported with appropriate ETS load parameters (automatic detection available).
• Parallel switching: Channels may be paralleled on the same phase via ETS (see datasheet wiring notes).

KNX Functions and Diagnostics

• ETS application: Scenes, forced operation, block, staircase timer, and operating-hours functions.
• Five-zone dim curve: Adjustable dimming speed in each zone.
• Channel RGB LEDs: Status and fault notification; front-panel manual control.
• Load detection: Load presence and load-type detection per ETS configuration.
• Safe commissioning: KNX programming possible without 230 V at the device.

At a Glance

Specification	Detail
Product type	KNX universal dimming actuator — 4-channel
Order code	ITR501-0004
Output channels	4 × 250 W (resistive rating per datasheet)
Load types	R, L, C — incandescent, halogen, LV transformers, dimmable LED/CFL
Mains	230 V AC ±10 %, 50 Hz
KNX	TP (S-mode device); bus-powered / external DC per installation
Configuration	ETS
Mounting	DIN rail — 6 modules
Protection	IP 20
Dimensions (H × W × D)	105 × 90 × 64 mm
Certification	KNX certified

Per-channel load limits, cable sections, and connection diagrams are under Technical Specifications. Datasheet, manual, ETS file, CAD, and KNX certificate are under Downloads.

Applications and KNX Integration

• Multi-zone residential: Four dimmed circuits from one DIN module for living, dining, kitchen, and terrace lighting.
• Commercial fit-out: Mixed LED and halogen loads in retail or hospitality with per-channel phase/neutral on three-phase boards.
• Two-channel alternative: When only two circuits at higher wattage are needed, specify the ITR501-0002 2-Channel Universal Dimmer (2 × 300 W).
• Switching and dimming mix: Combine with the ITR504-0016 4-Channel Combo Actuator for switched and dimmed loads on the same KNX line.
• KNX infrastructure: Power the line from an Interra ITR900 640 mA KNX Power Supply; extend inputs with ITR104 4-Channel Universal Interface or ITR108 8-Channel Universal Interface.
• User interface: Scene recall from the Interra 4/10.1″ KNX Touch Panel (ITR110).

Choosing Interra ITR501 Universal Dimmers

The ITR501-0004 is the four-channel, 250 W-per-channel variant for dense dimming from a single 6-module width. Choose ITR501-0002 for two channels at 300 W each. Other ITR501 suffixes add Ethernet or digital/analog inputs — see the datasheet order-code table (X2 Ethernet, X3 inputs, X4 channel count).