Telemecanique XB4BA51 Momentary 22mm Push Button

The Telemecanique XB4BA51 is a 22 mm yellow flush momentary pushbutton with spring return and a single normally open contact, designed for precise manual operator control in industrial automation and machine control systems. It mounts on panels with a 22 mm diameter, features a chromium-plated metal bezel and a Zamak fixing collar, and uses screw-clamp terminals for reliability in harsh environments. The operator is yellow flush and unmarked, making it easy to identify for start, cycle initiate, jog, reset, or other process control functions. Electrical specifications include a 600 V AC maximum rating and 10 A maximum current, with a slow-break contact operation, and it carries IP66, IP67, IP69, IP69K protection when installed in assembled panels. Part of the Harmony XB4 family by Telemecanique (Schneider Electric), the XB4BA51 is a common choice for control panels, motor control centers, conveyors, packaging machinery, machine tools, and process equipment where dependable momentary input is required. Common replacements include Schneider Electric XB5AA51 or a combination of ZB4BA5 + ZB4BZ101 for retrofit or expansion.