Short circuit protection Circuit is often a desirable feature to add to power amplifiers or power supplies, for both safety concerns and protection of circuitry.
A common example of short-circuit is when positive and negative terminal of a battery or Power Supply are connected together with a low-resistance conductor, like a wire. In this condition, battery or Power supply can set to fire and can even explode.
To avoid this short circuit condition, Short-circuit Protection Circuit is used. Short-circuit Protection Circuit will divert the flow of current or break the contact between the circuit and the power source.
So here we are going to study and design circuit to avoid the damage due to short-circuit in it.
Simple Short Circuit Protection Circuit with Relay
This is the very simple short circuit protection circuit we made it with relay and some other components. you can use this circuit with any Fixed voltage Power Supply or Battery.Â
Use Relay according to the Input Voltage and Load and also change Resistor R1 according to the Input Supply
Parts List For Short Circuit Protection Circuit With Relay
- Â Relay 5V/6V/9V/12V/24VÂ as per your Requirement
- LED :- Red,Green
- Push SwitchÂ
- Connector :- 2 pc
- Resistor R1 (Value in Circuit Diagram)1/4 WattÂ
- And Some Wires
Every lab needs to be equipped with essential equipment. Out of all I would say power supply is most important since it powers up the projects. Batteries, DC adapters can do Continue Reading….
Short Circuit Protection Circuit For Variable Power Supply
We can use same circuit with some modification with our Variable Power Supply Circuit. This circuit will work at 7 volt to 35 volt input supply without any change.
We are using Voltage regulator 7805 and 5 volt relay in this circuit
Parts List
-  Relay 3V If Voltage Regulator 7803
- Relay 5V If Voltage Regulator 7805
- LED :- Red,Green
- Push SwitchÂ
- Connector :- 2 pc
- Resistor R1 22-33 Ohm with 7803, 100 Ohm with 7805
- And Some Wires
PCB Layout for Short Circuit Protection Circuit
You can take Out print of this paper at A4 Paper SizeÂ
Watch Video For Details
Short Circuit | Over Load | Over Current Protection Circuit Diagram
This circuit is a modify version of above circuit with this circuits not only protect your device from short circuit it also protect from over load and over current
What is Over LoadÂ
The term “overload” describes a slight and gradual increase in current value over a relatively long period of time. For Example:- This is due to the excessive amount of current drawn by the motor, which can be many times the rated current. This is caused by too much load on the motor. The systems are protected With help of this overload protection Circuit  you can protect your circuit from overload.
What is Over Current
The term “overcurrent” (sometimes called a short circuit or ground fault) describes a sudden and rapid increase in current over a short period of time (fractions of a second). Circuits and devices are protected from overcurrent with this over current protection circuit.
Over Load & Over Current Protection Circuit Diagram
Simple Over Current Protection Circuit Diagram
Parts List
- Relay 1 Pc, Use Relay according to your circuit or device ( You can use Relay 5V To 24V as per your need )
- Q1 Transistor BC547 1Pc
- Resistor 1K 1/4watt, VR 100K
- Push Switch ( Push To On)
- LED Red & Green or you can use Bicolor LED
Note:- If Input is 5v you can use 5v relay if Input is 12v you have to use 12v relay and 24v relay for 24v Input