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    Picture of 0.5 kVA Variac Transformer, Single Phase
    Picture of 0.5 kVA Variac Transformer, Single Phase
    Picture of 0.5 kVA Variac Transformer, Single Phase
    Picture of 0.5 kVA Variac Transformer, Single Phase
    Picture of 0.5 kVA Variac Transformer, Single Phase

    0.5 kVA Variac Transformer, Single Phase

    1 review(s) | Add your review
    SKU: PH-VT-0d5K
    $169.58
    ● 0-250V continuously adjustable output from a 110V or 220V input. ● High-grade silicon steel core and pure copper windings ensure minimal loss and quiet operation. ● Supports both 110V and 220V input voltages (field selectable). ● Rated output current of 1.6A, compatible with 50/60Hz frequencies. ● Robust construction with flame-retardant insulation and corrosion-resistant casing.
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    Overview

    The 0.5 kVA single-phase variac transformer is a compact and cost-effective adjustable AC power supply designed for precise voltage control. With smooth and stepless output adjustment from 0 to 250V, this 500VA variac voltage regulator provides stable and reliable voltage regulation for laboratory testing, educational experiments, and small electrical equipment. Built with high-quality copper windings and an efficient carbon brush contact system, this variable autotransformer ensures low distortion output, high efficiency, and long service life. Its lightweight structure makes it easy to install and operate in both industrial and bench-top applications. This model supports 110V or 220V input voltage options and operates at both 50Hz and 60Hz, making it suitable for global markets.

    0.5 kva single-phase variac voltage regulator feature

    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.
     

    Details

    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.
    0.5 kva single-phase variac voltage regulator details
    Specs
    Phase 1-Phase
    Frequency 50Hz 60Hz
    Rated Input Voltage 220V 110V
    Rated Output Voltage 0~250V 0~130V
    Rated Capacity 0.5 kVA 0.5 kVA
    Max Output Current 1.6A 3.0A
    Usage SVC
    Current Type AC
    Actual Output Current (Actual output voltage * rated current) / maximum output voltage
    Type Contact Type Regulators
    Dimension (150*125*130) mm
    Weight 3.1 kg

     

    Note: Support the split phase (L1, L2+N, G). Please contact us.

    Application
    Variac voltage regulator for machine speed control

    Machine Speed Control

    Variac voltage regulator for mechanical voltage boost

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    Variac voltage regulator for current control

    Current Control

    Variac voltage regulator for withstand voltage test

    Withstand Voltage Test

    FAQ

    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.

    1 review(s)
    5.0 1
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    Chris | 5/15/2026 5:49 AM
    Looks Vintage but Works Great
    This thing looks like it came out of an old science classroom, but I love it. I use it for testing old electronics so I don't accidentally fry them by plugging straight into the wall. The knob turns nice and smooth. It's not something you need every day, but when you do need it, nothing else really works the same. Solid price for what it does. If you're into fixing old radios or amps, just grab one.
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