Voltage reducer RN-5,0A/12V (RN500) is used to reduce and stabilize the DC voltage from the range of 12÷14V to the value of 12V (11V÷Uin DC regulation). If the input voltage drops below the threshold of the set output voltage, the transistor opens completely and the reducer conducts losslessly (voltage drop ΔU<1%). This allows full use of the energy stored in the power supply's battery in battery operation.