KEAO MRB3000VA Wall Mounted 3kVA Full Power Automatic Voltage Regulator Single Phase AC Pure Sine Copper 5-Year Warranty

A relay-type voltage stabilizer (also known as a step-type or switching-type voltage stabilizer) is an automatic voltage regulation device that uses electromechanical relays to switch between different taps on a transformer in response to input voltage fluctuations, thereby maintaining a stable output voltage.

How It Works

1. Transformer with Multiple Taps:
   The core component is an autotransformer (or sometimes a multi-winding transformer) with several fixed voltage taps (e.g., ±5%, ±10%, ±15%).

2. Voltage Sensing Circuit:
   A control circuit continuously monitors the input (or output) voltage.

3. Relay Switching:
   When the input voltage rises or falls beyond a preset threshold (e.g., outside 220V ±5%), the control unit activates specific relays to connect the appropriate tap on the transformer.

4. Stepwise Correction:
   Output voltage is corrected in discrete "steps" (e.g., 10V or 20V increments), not continuously.

Advantages

• Simple and robust design
• Low cost compared to servo or static stabilizers
• Fast response time (typically 10–50 milliseconds)
• No moving parts (except relay contacts), so less mechanical wear than servo motors
• Suitable for residential and light commercial use (e.g., protecting TVs, refrigerators, ACs)

Q1: What Is The Guarantee?
A1:Within 5 Year From The Sale Date, If There Are Any Accessory Problems,You Just Provide The Photos Of Damaged Accessory, Then We Will Provide A Satidfication After-Sale Service For Free.

Q2: Can We Put/Show Our Own Logo On Your Products?
A2: Yes, No Problem, However, The Quantity Should Be A Bit Big.