Alledio Relay MX Extender

MX-EXT5 has five normally-open contacts (O1–O5); MX-EXT3 has three (O1–O3). Supply and bus terminals are the same on both.

In Mode 1 both drive a 3-speed fan on O1–O3, and MX-EXT5 also switches two on/off valves on O4 and O5. In Mode 3 MX-EXT5 runs two curtain drives, MX-EXT3 one drive plus a free relay.

Fan-coil motors, on/off valves, curtain drives and lighting — up to 5 A per contact at 250 V AC or 3 A at 30 V DC (resistive), with a combined maximum of 16 A through COM.

All outputs on one COM must be in one voltage band — do not mix 230 V AC and extra-low voltage. Outputs and COM are not fused: fit an MCB or fuse matched to the load, max. 5 A per output.

Everything is set over Modbus: application mode, slave address (1–247), motor interlock, motor group mask and bus termination. Devices ship in Mode 1 at address 8, 115200 baud, 8N1.

Factory-fresh devices share address 8, so commission one device by its factory serial (holding registers 9–26). The complete register map is in the datasheet.

The contacts are normally open: removing VIN opens them. Contact state on Modbus timeout is not a safety function.

The contacts provide micro-disconnection only and are not a disconnecting safety device. Fan-speed and curtain interlocking is application firmware, not a safety function.

On a DIN rail EN 60715 TH35 inside a closed electrical cabinet, lockable control panel or fan-coil enclosure that keeps the module dry, so the terminals are not accessible to untrained persons. Ingress protection is IP30 as installed.

Optional wall clips, purchased separately and not included in the package, are only for mounting inside the same enclosure, not on an open wall.

Slovenia, EU. Manufactured by Andivi d.o.o., Zagrebška cesta 102, 2000 Maribor, Slovenia, with a 1-year warranty.

The Relay MX Extender datasheet and all other Alledio product documents are collected on the Documents page. For this product, see Documents – Relay MX Extender.