0.5 kVA Variac Transformer, Single Phase

Feature

• Stepless & Smooth Voltage Adjustment: Provides continuous adjustable AC output from 0-250V, allowing precise voltage control without waveform distortion.
• Compact & Lightweight Design: The 500VA structure is easy to handle and install, ideal for laboratory benches and small equipment setups.
• High Efficiency Copper Coil Construction: Premium copper windings ensure stable performance, reduced heat generation, and long-term durability.
• Stable Output with Low Distortion: Delivers reliable and clean AC voltage regulation suitable for sensitive testing equipment.
• Dual Input Voltage Options: Available in 110V or 220V input versions, compatible with 50Hz and 60Hz power systems.

1. Imported Carbon Brushes: More precise adjustment, no power tripping, and longer service life.
2. All-copper Coils: The full-power voltage regulator uses a sufficient amount of pure copper coils for more stable operation.
3. Ventilation and Heat Dissipation Holes: The entire product is equipped with heat dissipation holes, ensuring stable operation and heat resistance.
4. Standard Electronic Wire: High-temperature resistant electronic wire, multi-strand copper wire with an outer tin-plated layer, not easily oxidized.

Application

Machine Speed Control

Mechanical Voltage Boost

Current Control

Withstand Voltage Test

Q1. Can I use this 500VA variac to test a 300W appliance? What is the maximum current?

Absolutely. This unit is rated for 500VA (0.5kVA). With a maximum output current of 1.6A, it is suitable for continuously powering loads up to approximately 350W-400W (depending on your input voltage). For resistive loads like heaters or incandescent lights, you can safely run near the full 500VA capacity. For inductive loads like motors, we recommend not exceeding 80% of the rating (approx. 400VA / 1.3A) to account for startup surges.

Q2. Is it difficult to switch between 110V and 220V input? Do I need special tools?

Input voltage selection is straightforward. The unit features a clearly marked voltage selector switch or accessible terminal jumpers inside the wiring box. Switching requires only a standard screwdriver. Important: Always ensure the unit is completely disconnected from mains power before changing the input voltage setting. If you are unsure about electrical modifications, we recommend having a qualified electrician perform the initial setup.

Q3. What happens if I turn the dial past 250V? Will it damage my device?

The variac allows continuous adjustment slightly above the nominal maximum. While it can output voltages up to ~270V (depending on line conditions), we strongly advise against exceeding 250V for extended periods. Prolonged over-voltage output can overheat the internal winding and may damage both the variac and your connected load. For safe operation, monitor the integrated voltmeter (if equipped) or use an external multimeter.