The Interra ITR520-0016 is a 20-channel KNX Combo+ switch actuator with 16 A @ 250 V AC per output. It uses the wide 15-module housing (246 × 90 × 64 mm) for maximum channel density in hospitality and large residential distribution boards.

Bus-powered (max 20 mA), ETS-configured (S-mode), with lighting/heating/shutter/fan-coil modes, scenes, logic, timers, manual override, and last-state memory. The ITR520 variant provides 8 converter objects (family table); working-hours counter is not listed for ITR520/524 rows — verify in ETS application.

Key Features — 20 × 16 A Combo+

• 20 relay outputs — blocks C1–C6 through C19–C24 per six-output grouping.
• Shutter/blind: Two consecutive outputs per drive; 24 V shutter uses four outputs in first block positions.
• Fan coil: 4 outputs (2-pipe) or 5 outputs (4-pipe) in eligible block positions.
• 245 group addresses maximum (family datasheet).

At a Glance

Specification	Detail
Order code	ITR520-0016
Outputs	20 × 16 A @ 250 V AC
Dimensions (W × H × D)	246 × 90 × 64 mm
DIN modules	15
KNX bus (max)	20 mA

Applications and KNX Integration

• Hotel GRMS: Multiple guest-room functions from one high-density actuator.
• Compare: ITR516-0016 (16 ch, 10 modules) or ITR524-0016 (24 ch, same width).
• Dimming: ITR501-0004 for dimmed lighting alongside switched channels.

Choosing Interra Combo Actuators

ITR520-0016 is the 20-output Combo+ module in the 246 mm enclosure. Manufacturer order codes ITR525-0020 appear on the current website for the same platform — confirm SKU mapping at order time.