The Interra ITR504-0016 is a KNX combo switch actuator with four independent 16 A outputs at 250 V AC (120 A or 165 A inrush per channel). Each output is configurable in ETS for lighting, heating (switching), shutter/blind (two consecutive outputs), 24 V shutter/blind (four outputs in a block), or fan-coil modes (4- or 5-output blocks).

The module is KNX bus-powered (max 20 mA) with no separate auxiliary supply. Front-panel push buttons provide manual override when bus communication fails. Features include scenes, logic gates, timers, forced operation, working-hours counter, periodic monitoring, configurable feedback telegrams, and last-state memory after power loss. Mounting is on DIN rail (6 modules, 105 × 90 × 64 mm).

Key Features — 4 × 16 A Combo Outputs

Output and Load Capability

• 4 channels: 16 A @ 250 V AC per output; high inrush for LED and fluorescent loads (per datasheet reference table).
• ETS modes: Switching, shutter/blind, 24 V shutter/blind, fan coil 2-pipe (4 outputs), fan coil 4-pipe (5 outputs) within output blocks.
• Output blocks: Six outputs per block (C1–C6, C7–C12, …) — one block on the 4-channel device.
• Group addresses: Up to 245 group addresses and 245 assignments (per family datasheet).

KNX Integration

• S-mode device; full configuration in ETS.
• 4 converter objects and 4 logic gates on ITR504 (per family table).
• Working-hours counter supported on ITR504/508/512/516 variants.
• KNX certified; IP 20; operating −10 °C to +70 °C.

At a Glance

Specification	Detail
Product type	KNX combo switch actuator — 4-channel
Order code	ITR504-0016
Outputs	4 × 16 A @ 250 V AC
Inrush current	120 A or 165 A (per channel, datasheet)
KNX bus current (max)	20 mA
Power supply	KNX bus (no external PSU)
Mounting	DIN rail — 6 modules
Dimensions (W × H × D)	105 × 90 × 64 mm
Protection	IP 20

Load reference values and wiring diagrams are under Technical Specifications. Downloads cover the ITR5XX-0016 family (includes ITR504).

Applications and KNX Integration

• Apartments and hotel rooms: Lighting, heating contactors, and one shutter or fan-coil zone from a single 6-module device.
• More channels: Step up to ITR508-0008 (8 ch), ITR512-0016 (12 ch), or ITR516-0016 (16 ch).
• Dimming circuits: Pair with ITR501-0002 Universal Dimmer or ITR501-0004 for phase-controlled loads.
• Bus power: Supply the line from ITR900 640 mA KNX Power Supply.

Choosing Interra Combo Actuators

ITR504-0016 fits small zones needing four switched 16 A circuits in 6 DIN modules. Higher channel counts use wider enclosures (10 or 15 modules) — see ITR520-0016 (20 outputs) and ITR524-0016 (24 outputs) in the Combo+ range.