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    ABB-Welcome M251021Px Row Pushbutton Module — Specification Sheet

    September 08, 2026 1 min read

    3- and 4-button row pushbutton modules for building an ABB-Welcome outdoor station call panel — the M251021P3/P4.

    💾 Download Original PDF
    Full text manual (for reference)

    Specification sheet for the ABB-Welcome M251021Px Row Pushbutton Module — available in 3-button (M251021P3) and 4-button (M251021P4) versions for outdoor station bell/call panels.

    Overview

    This simple pushbutton module lets you build up a bell/call panel one row at a time. Each button can be configured for a single purpose — call a specific apartment, call the guard unit, or turn on a light. Since each button can be configured to call 2 addresses or functions, a single 3-button module can be set up to call as many as 6 apartments.

    Key Features

    • Nameplates can be extracted (swapped) without dismantling the outdoor station
    • Backlit buttons for clear visibility at night
    • Each pushbutton can be configured to call 2 addresses or functions
    • Connects to adjacent modules via connectors on either side, for building a multi-row panel

    Terminal / Connector Reference

    No. Function
    1 Connector to previous module
    2 Connector to next module

    Technical Specifications

    Models M251021P3 (3-row), M251021P4 (4-row)
    Operating temperature -40 °F to +158 °F
    Ingress protection IP54
    Bus voltage 20-30 VDC (from system controller or local power supply through audio module)
    Product dimensions 2.83" x 3.82" x 0.98"

    Support

    Contact ABB Low Voltage Products USA Technical Support at 888-862-3289 or techsupport@tnb.com, Monday–Friday 7:00 a.m.–5:30 p.m. CST, or visit www.abb.us/lowvoltage.