How To Make Short Circuit Protection Circuit - Instructables

Introduction: How to Make Short Circuit Protection Circuit

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Hii friend,

Today I am going to make a circuit for Short Circuit protection.This circuit we will make using 12V Relay.

How this circuit will Work - when short circuit will occur on the load side then the circuit will be automatically cut off.

Let's get started,

Step 1: Take All Components As Shown Below

Components required -

(1.) Relay - 12V x1

(2.) Push button switch x1

(3.) Battery - 9V x1

(4.) Battery clipper x1

(5.) Connecting wires

(6.) LED - 9V (My LED is of 4V but to make 9V LED I connected 220 ohm resistor to +ve leg of the LED)

(7.) Resistor - 330 ohm x1

(8.) LED 5mm - 3V x2 (Red & Green)

Step 2: Connect Button Switch to Relay

Firstly we have to solder Push button to the common pin and coil-1 pin of the Relay as solder in the picture.

Step 3: Connect Green LED

Next solder -ve leg of green LED to coil-1 pin and Normally Open (NO) pin of the Relay as you can see in the picture.

Step 4: Connect Red LED to Relay

Next connect -ve pin of Red LED to Normally close (NC) pin of the Relay and

Solder +ve leg of Red LED to +ve leg of green LED as solder in the picture.

Step 5: Connect 330 Ohm Resistor

Next we have to solder 330 ohm resistor between +ve legs of LEDs and coil-2 pin of the Relay as you can see in the picture.

Step 6: Connect Battery Clipper Wire to the Circuit

Solder +ve wire of battery clipper to coil-2 pin of Relay and

-ve wire of of battery clipper to common pin of the relay as solder in the picture.

Step 7: Connect Output Wire to the Circuit

Next connect +ve output wire to +ve of battery clipper/coil-2 of relay and

Solder -ve output wire to coil-1 pin of the Relay as picture.

Step 8: Connect Battery to Battery Clipper

Now our circuit is ready so connect battery to battery clipper.

How it's working - When we will connect battery then Red LED will glow. Now we have to press push button then Green LED will glow.

Step 9: Now Connect Load

Now we have to connect 9V LED as load to the output wires.As you can see in the picture 9V LED is glowing.

Step 10: When Short Circuit Occur

Unfortunately short circuit occur on the output wires then circuit will be automatically cut-off.

For again using this circuit press button switch then again 9V LED will glow.

Red LED - shows short circuit occur.

Green LED - Short circuit is not occur.

This type we can make short circuit protection circuit.

Thank you