How to protect your home and equipment from low voltage
If lights dim, motors struggle, miners restart or appliances shut down during busy hours, the supply may be falling below the equipment’s safe operating range. Rustek helps you measure the problem and select an automatic voltage stabilizer that can correct it.
Get a Rustek recommendation →A voltage stabilizer can raise low mains voltage to a stable output only while the input remains inside the stabilizer’s specified operating range. Correct selection requires the real minimum input voltage, total simultaneous load, starting current, phase and a suitable capacity margin.
Common signs of persistent low voltage
Motors struggle or heat up
Refrigerators, pumps and washing machines may start slowly, hum, trip or run hotter than normal.
Electronics restart
Televisions, routers, mining PSUs and control boards may reset when the voltage drops under load.
Lights repeatedly dim
Dimming when a large load starts can indicate a supply sag, overloaded circuit or excessive wiring voltage drop.
Low voltage is a symptom, not always the root cause.
Large motor starts and step loads can cause voltage sags. Loose connections, undersized conductors, overloaded circuits, a weak local supply or transformer conditions can also contribute. A stabilizer should not be used to hide unsafe wiring.
When an AVR is a good fit
| Input varies within a known range | Choose an AVR rated to regulate across that range |
| One sensitive appliance is affected | Use an appliance-specific stabilizer |
| The complete property is affected | Calculate a central whole-home solution |
| Power disappears completely | A UPS or backup source is also required |
| Wiring is damaged or undersized | Repair the electrical installation first |
What Rustek needs to size a low-voltage stabilizer
Actual voltage range
Record minimum and maximum input voltage, preferably under real load and at different times.
Load and starting current
Add simultaneous loads and identify compressors, motors and other equipment with high startup demand.
Phase and installation
Confirm single or three phase, connection method, environment and future expansion needs.
Useful answers before you choose
Only if the input remains within the unit’s published range at the connected load. Below that range, regulation may stop or protective shutdown may occur.
No. Capacity and input range are separate requirements. Wiring, supply impedance and phase must also be correct.
No. An AVR regulates available mains power. A UPS, inverter or generator is needed for backup energy.
Continue with the closest match
Send us your lowest measured voltage.
Include the load list and phase. Rustek will help identify a suitable stabilizer range.