When any object (typically a hand or body part) breaks that zone, the light curtain sends a stop signal to the machine safety circuit. This class of device is specified per IEC 61496 for electro-sensitive protective equipment (ESPE) and is used to guard presses, robots, assembly stations, and any automated cell where personnel access must be detected without physical barriers.
As a safety light curtain, the key selection parameters are detection capability (finger, hand, or body), protective height, and range. The F3SJ-A0605P20-01TS is part of a series that offers multiple resolutions and lengths; the specific order code determines the exact protective field dimensions and minimum object sensitivity. When specifying this part for a guarding application, verify that the detection zone fully covers the hazard opening with no blind spots, and that the response time is compatible with the machine's stopping performance per ISO 13855.