Short circuit protection circuit diagram

Short circuit protection circuit diagram

Short circuit protection circuit diagram

Circuit Description

When Sl is pressed, the coil of K1 is energized, closing its normally open contacts. If the regulated de input is between 1 and 24 V, that voltage feeds the base of Q1 through Rl, turning on the transistor, and latching the relay. When that occurs, LED2 glows indicating that all is okay. If there is a short to ground at the circuit's output (i.e., in the device being powered), the voltage that feeds the base of Q1 goes to zero, turning off the transistor. Then, LEDl glows because K1 is de-energized to indicate the short circuit.