The LMLK1-1RS4-29172-50 is a single-pole hydraulic magnetic circuit protector manufactured by Airpax/Sensata Technologies, featuring an alarm switch with electrical trip functionality and mid-trip indication. This device is designed for reliable circuit protection and accurate circuit control in international power switching applications, supporting both DC and AC operation at 50/60 Hz frequencies. The unit features a rocker handle with orange marking color and white rocker handle, configured for vertical or horizontal mounting with dimension A of 0.760 ± 0.007 inches (19.30 ± 0.18 mm) and panel thickness of 0.062 ± 0.005 inches (1.57 ± 0.13 mm). With a rated current of 29.172 amperes and VDE and CCC approval, this protector is ideal for equipment requiring both overload and short-circuit protection with integrated alarm indication for maintenance and safety monitoring.