The LELK1-1RS4-30452-100 is a single-pole hydraulic magnetic circuit protector equipped with an alarm switch, designed for reliable power switching and circuit protection in international applications. This device features a 100 ampere current rating and operates across multiple voltage and frequency configurations, including DC (65V to 300V), 50/60 Hz AC (125V to 480V), and 400 Hz AC (250V). The protector incorporates selectable delay characteristics (short delay, long delay, motor start, and instant trip options) to accommodate various load profiles and protection requirements. With VDE approval to VDE 0660 Part 101 and UL 1077 recognition, this circuit protector is suitable for industrial equipment, power distribution systems, and applications requiring both overload and short-circuit protection with alarm notification capabilities.