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SHORT_CIRCUIT_PROTECTION_CIRCUIT

2016-09-15 05:39  
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SHORT_CIRCUIT_PROTECTION_CIRCUIT
When S1 is pressed, the coil of K1 is energized, closing its norrrtally open contacts. If the regulated dc input is between 1 and 24 V, that voltage feeds the base of Q1 through R1, 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, LED1 glows because K1 is de-energized to indicate the short circuit.