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    ABB Welcome M25102xA-x — Audio Module Specifications

    September 08, 2026 2 min read

    Specification sheet for the ABB Welcome M25102xA-x Audio Module family, the compulsory communication module for ABB Welcome outdoor door stations.

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    Full text manual (for reference)

    Specification sheet for the ABB Welcome™ M25102xA-x Audio Module family (M251021A, M251022A, M251023A, M251024A, in -A and -W finishes) — the compulsory communication module for all ABB Welcome audio and video outdoor door stations.

    Overview

    This audio module is a compulsory part of all outdoor stations, facilitating communication between the system controller and the outdoor station. It can be connected directly to door locks and is available with up to 2 integrated rows of pushbuttons.

    Covered Models

    • M251023A-A / M251023A-W
    • M251022A-A / M251022A-W
    • M251021A-A / M251021A-W
    • M251024A-A / M251024A-W

    Key Features

    • Audio module is compulsory for any audio or video outdoor station composition
    • 3 LED indicators for operation status: call established/system busy, communication possible, and door unlocked
    • One lock can be directly connected without an independent power supply
    • Additional terminal available for a second lock
    • Lock release time and speaker volume are adjustable
    • Integrated light sensor for day/night mode
    • Mode setting for pushbuttons as single or double column
    • 3 configuration options: audio without pushbutton, audio with 1 row of pushbuttons, or audio with 2 rows of pushbuttons
    • Optional voice synthesizer available

    Terminal & Control Reference

    Number Function
    1 LED call status
    2 LED illuminates, indicating possible communication
    3 LED door status
    4 Call pushbuttons
    1 Connector for camera module
    2 Connector for device software update
    3 Plug-in clamps (COM-NC-NO), 30V AC/DC 1A
    4 Plug-in clamps (Lock-GND), 18V 4A impulsive / 250mA holding
    5 Plug-in clamps (DC-GND) for additional power supply
    6 Plug-in clamps (a-b) for bus connection
    7 Connector for induction loop module
    8 Connector for next module
    9 Connector for exit pushbutton
    10 Connector for sensor for checking the door status
    11 Rotary switch for setting the address of OS (1–9)
    12 Set feedback tones for pushbuttons: ON/OFF
    13 Configure pushbuttons in single or double column (ON = double column, OFF = single column)
    14 Configure functions of the 1st/2nd pushbutton
    15 Adjust the loudspeaker volume
    16 Adjust the door lock release time

    Specifications

    Operating Temperature -40°F to +158°F
    Wire Clamps 2 x 0.28 mm² – 2 x 1 mm²
    Ingress Protection IP54
    Bus Voltage 20–30 VDC (from system controller or system component configured as local power supply through audio module)
    Door Opener (LOCK-GND) 18V, 4A impulsive, 250mA holding
    Door Opener (COM-NC-NO) 30V, 1A
    Product Dimensions 2.83" x 3.82" x 1.50"

    Contact / Support

    ABB Low Voltage Products, 8155 T&B Boulevard, Memphis, TN 38125 — www.abb.us/lowvoltage
    USA Technical Support: 888-862-3289 | Customer Service: 888-862-3290, 7:00 a.m. – 5:30 p.m. CST, Monday – Friday | techsupport@tnb.com