Automatic Voltage Regulator (AVR) is an electrical device that automatically maintains a constant voltage level to protect equipment from voltage fluctuations such as low voltage (brownouts) or high voltage (surges).
- How an AVR Works
- An AVR monitors the incoming voltage from the power supply:
- If the voltage drops below the required level, the AVR boosts it.
- If the voltage rises above the safe level, the AVR reduces it.
- It delivers stable output voltage to connected equipment.
- Main Functions
- Stabilizes input voltage
- Protects electrical and electronic devices
- Improves equipment lifespan
- Prevents damage from voltage spikes and dips
- Common Types of AVR
- Relay Type AVR
- Uses relays to switch voltage levels.
- Cost-effective and common for small offices and homes.
- Servo Controlled AVR
- Uses a servo motor for precise voltage correction.
- Suitable for industrial equipment, servers, and medical devices.
- Static AVR
- Uses electronic circuits (no moving parts).
- Faster response and higher reliability.
- Where AVR Is Used
- Data centers and server rooms
- Office IT infrastructure
- Industrial machinery
- Hospitals and laboratories
- Telecommunication equipment
- UPS and power distribution systems
- AVR vs UPS (Quick Difference)
- AVR: Stabilizes voltage only.
- UPS (Uninterruptible Power Supply): Provides backup power during outages and may also include voltage regulation.
- Typical Capacity Range
- Small units: 500 VA – 5 kVA (home/office devices)
- Medium: 5 kVA – 50 kVA (IT equipment, offices)
- Large/Industrial: 50 kVA – 2000+ kVA
