STI MS4308BX P 42687-0080 Light Curtain Transmitter

The STI MiniSafe MS4300 Series light curtain transmitter MS4308BX (P/N 42687-0080) is a compact safety sensor designed for machine guarding in industrial environments, forming one half of a two‑piece safety curtain when paired with the MS4308BR receiver. As part of the MS4300 family, the transmitter sends a dense matrix of infrared beams across a guarded opening; if any beam is broken by a hand or body part, the associated control circuit receives a signal to stop the protected equipment, preventing access to hazardous zones. The MS4308BX requires its companion MS4308BR receiver (sold separately) to complete the system; together they support rapid detection for applications such as presses, robotic work cells, conveyors, and other automated lines where operator safety is critical. Identified by part number 42687-0080, this module is designed for easy replacement within STI's MINISAFE MS4300 Series, offering a modular approach to safety sensing with established interconnects to common safety controllers and interlock configurations. The transmitter's compact enclosure supports straightforward mounting and integration with STI's safety interfacing, making it a practical upgrade for legacy machines that previously used older MS4300 components.