The Interra ITR508-0008 is an 8-channel KNX combo switch actuator with 16 A @ 250 V AC per output (120 A or 165 A inrush). Outputs are configured in ETS for lighting, heating, shutter/blind pairs, 24 V shutter groups, or fan-coil blocks within the ITR5XX-0016 platform.

Bus-powered (max 20 mA), with manual override buttons, scene/logic/timer functions, working-hours counter, and last-state memory. The 8-channel model uses the compact 6-module enclosure (105 × 90 × 64 mm).

Key Features — 8 × 16 A Combo Outputs

Outputs and Blocks

• 8 × 16 A relays with high inrush rating for modern lighting loads.
• Two output blocks of six (C1–C6, C7–C12) for shutter/fan-coil zoning per datasheet rules.
• 245 group addresses / 245 assignments maximum.
• 4 converters and 4 logic gates; working-hours counter included.

At a Glance

Specification	Detail
Order code	ITR508-0008
Outputs	8 × 16 A @ 250 V AC
KNX bus (max)	20 mA
Dimensions (W × H × D)	105 × 90 × 64 mm
DIN modules	6
IP rating	IP 20

See Technical Specifications and Downloads for the full ITR5XX-0016 family datasheet.

Applications and KNX Integration

• Whole-floor switching: Multiple rooms’ lighting, blinds, and heating from one module.
• Fewer channels: ITR504-0016 (4 ch); more: ITR512-0016 (12 ch).
• Dimming: Add ITR501-0004 Universal Dimmer for dimmed circuits.

Choosing Interra Combo Actuators

ITR508-0008 doubles capacity versus ITR504 in the same 6-module width. For 12+ channels, use ITR512 or ITR516 (10-module enclosure).