Over and Under Voltage Protection System

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Original price was: 5,999.00₹.Current price is: 2,999.00₹.

Protect your appliances with Over and Under Voltage Protection System, featuring precise monitoring, relay-based control, LED indicators, and LCD display for real-time status updates. Ideal for safeguarding electronics from voltage fluctuations in both residential and industrial settings.

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Ensure the safety of your electrical appliances with Over and Under Voltage Protection System. Designed to safeguard your valuable equipment from voltage fluctuations, this system offers reliable protection and peace of mind.

Key Features:

  • Monitors both over and under voltage conditions to protect connected devices.
  • Utilizes an ATMega328p Microcontroller for precise voltage monitoring and control.
  • Equipped with a clear LCD display for real-time voltage status monitoring.
  • Includes a 5V relay for switching power supply to connected devices.
  • Incorporates LED indicators for easy status identification.
  • Utilizes high-quality components for long-lasting performance and reliability.
  • Compact and easy to install on a PCB.

Components Used:

  • ATMega328p Microcontroller
  • 16 MHz Crystal Oscillator
  • 22 pF Capacitor
  • 5V Relay
  • PCB
  • LCD Display
  • AC Bulb (or load)
  • Diodes
  • Capacitor
  • LM7805 Voltage Regulator
  • LEDs
  • Resistor
  • Potentiometer
  • Transformer


  • The system continuously monitors the input voltage using the ATMega328p microcontroller.
  • If the voltage exceeds the preset over-voltage threshold, the relay disconnects the power supply, protecting connected devices.
  • Similarly, if the voltage drops below the preset under-voltage threshold, the relay interrupts the power supply to prevent damage.
  • Real-time voltage status is displayed on the LCD, allowing users to monitor the voltage levels.
  • LED indicators provide visual alerts for over and under-voltage conditions.


  • Ideal for protecting sensitive electronic equipment such as computers, TVs, and home appliances from voltage fluctuations.
  • Suitable for use in areas where voltage fluctuations are common or where the power supply is unreliable.
  • Useful in industrial settings to protect machinery and equipment from voltage surges and drops.
  • Can be integrated into voltage stabilizers, UPS systems, and power distribution units for enhanced protection and monitoring.