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    ABB-Welcome M251021K-x Keypad Module — Specification Sheet

    September 08, 2026 1 min read

    Specification sheet for the ABB-Welcome M251021K-x Keypad Module — an input device for keypad outdoor stations, available in aluminum, white, and stainless steel finishes.

    💾 Download Original PDF
    Full text manual (for reference)

    Overview

    The ABB-Welcome M251021K-x Keypad Module is an input device for keypad outdoor stations, ideal for apartment buildings and multi-home complexes. It's available in three finishes: aluminum (M251021K-A), white (M251021K-W), and brushed stainless steel (M251021K-S). It's used together with the M251021CR and M251022CR display modules.

    Key Features

    • Scroll up/down through residents' names, or type a name directly.
    • Names or call codes can be downloaded from a PC via USB cable, or edited directly from the keyboard.
    • Stores up to 3,000 names in memory.
    • Supports public passwords plus up to 6,000 customized passwords.
    • Locks out entry after repeated incorrect password attempts.
    • Compatible with an optional call guard unit.
    • Backlit keys for clear visibility at night.

    Connectors

    No. Function
    1 Program button
    2 Connector for previous module
    3 Connector for device software update
    4 USB connector for connecting to a PC to download/upload the configuration
    5 Connector for the next module

    Specifications

    Operating temperature -40°F to +158°F
    Ingress protection IP54
    Bus voltage 20-30 VDC (from system controller or system component configured as local power supply, through audio module)
    Product dimensions 5.39" x 6.10" x 0.94"

    Support

    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