ABB – MREL‑01 / 3AUA0000031854 – Relay Output Extension Module for ACS Drives

The ABB MREL‑01 (part number 3AUA0000031854) is an add-on relay output extension module for ACS310, ACS350, and ACS355 series variable frequency drives. It plugs directly into the keypad slot, providing three additional relay outputs while preserving the keypad connectivity—ideal for enhancing drive I/O without external wiring modifications.

Key Features & Specifications

• Model / P/N: MREL‑01 / 3AUA0000031854  

• Purpose: Extends ACS310/350/355 VFDs with 3 extra relay outputs

• Compatibility: Fits ACS310, ACS350, ACS355 series (+L511 version) not for IP66/67 models  

• Installation: Installed in keypad slot; keypad can be reinstalled on module

• Enclosure: IP20 panel; compact (70 × 118 × 46 mm)

• Weight: ~230 g  

• Certifications: CE; ABB drive accessory standards apply