Schneider Electric ZB4BG012 Key Selector Switch

The Schneider Electric ZB4BG012 is a Harmony XB4 3-position key selector switch built for secure machine mode selection in industrial control and operator interface systems. This maintained switch uses a 22 mm mounting diameter and a 421E key, with key removal available in the left, center, and right positions, making it suitable for operator stations, production equipment, conveyor controls, and packaging machines where authorized personnel must switch operating modes safely. It features a chromium-plated metal bezel, a ±45° angle of throw, and IP66, IP67, IP69, IP69K protection, with a mechanical durability of 1,000,000 cycles and an operating temperature range from -40 °C to +70 °C. Commonly used in machine control panels for replacement, retrofit, and upgrades by maintenance teams and system integrators, the ZB4BG012 adheres to IEC 60947-5-1, UL 508, and CSA C22.2 No. 14, and has commonly referenced replacements including ZB4BG2, ZB5AG2, and XB4BG21.