The SICK GS10-D4311 is a Safety Light Curtain (also known as a Type 2 ESPE) belonging to the compact GS10 series. It is designed to safeguard personnel by creating an invisible protective field around hazardous machinery. When this light beam is interrupted by an object or person, the device sends a stop signal to the machine's control system (e.g., a safety relay), halting operation and preventing injury.