Emergency Red Stop Button

An emergency stop push button switch (often called an E-stop switch) is a critical safety device designed to immediately halt hazardous machinery or equipment in emergency situations, preventing injuries, property damage, or further risks. Unlike standard on/off switches, it prioritizes rapid, intuitive activation and failsafe operation to stop power, motion, or dangerous processes instantly when triggered.

A key specification here is the 22mm cut-out size—this refers to the diameter of the circular hole required in control panels, machine enclosures, or dashboards to mount the switch. The 22mm size is an industry-standard dimension, widely adopted because it balances compactness (suitable for tight panel layouts) and usability (large enough for easy, gloved-hand access in industrial settings). Most 22mm E-stop switches feature a protruding, usually red actuator (per global safety standards like IEC 60947-5-5) paired with a yellow background, ensuring high visibility even in noisy or low-light environments.

These switches typically use a “mushroom-head” design for quick tactile recognition and require a twist-or-pull reset after activation—preventing accidental re-starting. They are rated for high durability (often IP65/IP67 ingress protection) to withstand dust, water, and mechanical impacts, making them ideal for manufacturing, construction, automotive, and robotics. The 22mm cut-out ensures compatibility with most standard control panels, simplifying installation and replacement across different equipment types, while their fail-safe contacts (normally closed) guarantee that any switch failure will not disable the emergency stop function.