Siemens 52PP22W2A W 52BJK Emergency Stop Push Button

Siemens 52PP2W2A/W 52BJK Emergency Stop Push Button is a 22 mm mushroom-head E-stop switch designed for fast, failsafe machine shutdowns. This maintained (positive-latching) emergency stop uses a red mushroom actuator and provides a 1 NO + 1 NC contact arrangement wired via screw terminals for reliable front-panel installation. The actuator is 22 mm in diameter with about a 40 mm depth and is designed to EN ISO 13850 safety standards, with model variants that include the 52BJK front-plate/assembly referenced in the product name. Variants in the 52PP2 family, such as 52PP2W2AS, are described by distributors as red, mushroom-head emergency stops with two-position maintained operation (MTD), suitable for control panels in industrial environments. In Siemens configurations, the stop button is used to interrupt control circuits and halt machinery during emergencies, with reset accomplished by the latching mechanism. This device is frequently cataloged by distributors like Mouser and Grainger for use in automation and safety systems.