LELK1-1RS4-30452-40 is a single-pole hydraulic magnetic circuit protector from the LEL series designed for DC power switching and circuit protection in international applications. The device features a panel thickness of 0.062 ± 0.005 inches (1.57 ± 0.13 mm) and a dimension A of 0.760 ± 0.007 inches (19.30 ± 0.18 mm) for single-pole configuration. It supports multiple current ratings ranging from 0.20 A to 150 A with corresponding DC resistance values and AC impedance characteristics at 50/60 Hz and 400 Hz frequencies. The protector offers selectable delay characteristics (41, 42, 43, 49, 51, 52, 53, 59, 61, 62, 63, 69, 71, 72, 73, 79) that provide precise trip timing across various overload percentages from 125% to 1000% of rated current. This device is suitable for equipment requiring reliable circuit protection with accurate control in industrial and commercial power distribution systems.