LELHPK11-1RS4-30560-125 is a single-pole hydraulic magnetic circuit protector designed for reliable circuit protection and power switching in DC applications. This unit features an internal configuration with alarm auxiliary switch (-1RS4) and is rated for 30 amps at 125V DC with short delay characteristics. The protector incorporates a hydraulic-magnetic mechanism that provides accurate trip response across a range of current levels, from 125% to 1000% of nominal rating, with trip times varying from milliseconds to several seconds depending on the fault current magnitude. The device is VDE and CCC approved, meeting international safety standards for circuit protection in industrial and commercial equipment. Common applications include DC power distribution systems, motor control circuits, and equipment requiring both overload and short-circuit protection with alarm notification capabilities.