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SVC11 catalogue models AC Voltage Regulators ST12 catalogue models Step-Down Transformers THG13 catalogue models Step-Up / Step-Down Transformers

Selected models

Explore 36 selected SVC, ST and THG models.

View 36 selected models All 46 series in 3D Full catalogue directory Not sure where to start?
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Goldsource · AC power products

AC voltage regulation & conversion.

  • Three featured families · 36 selected models
  • Regulators, step-down and step-up / step-down
  • Matched to your power supply requirements
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SVC-1000 AC voltage regulator, illustrative exterior render
ST-1000 step-down transformer, illustrative exterior render
HFM-THG-1000 step-up / step-down transformer, illustrative exterior render

SVC-1000 · ST-1000 · HFM-THG-1000 · Illustrative renders

01 — SVC-1000 · Front panel

Read the output
at a glance.

An analogue output meter, an illuminated power switch and three front outlets marked 110V, 220V and 220V.

02 — SVC-1000 · Enclosure & input

Vented. Easy
to carry.

Ventilation slots along the top and sides, with a top-mounted carry handle. The pictured rear panel is marked INPUT 160–250V.

03 — ST-1000 · Step-down

110V,
two outlets.

Two front outlets marked 110V and a circuit-breaker style switch. Confirm the specification for your current version.

04 — ST-1000 · Rear panel

Select the
input tapping.

A rear selector marked 240V / 220V / 200V / 110V, with a rear-mounted fuse holder.

05 — HFM-THG-1000 · Conversion

110V or 220V,
either way.

A front outlet marked OUTPUT 110V OR 220V, with folding polished wire carry handles.

06 — HFM-THG-1000 · Selection & fusing

Set the voltage,
protect the load.

A 110V / 220V input selector, a pictured rear marking of INPUT 220V OR 110V, 50/60Hz, and a side-mounted fuse holder.

Three product categories

One focus.
Three ways to connect.

  1. 01 · AC Voltage Regulator

    SVC-1000

    AC voltage regulation with an output meter and outlets marked 110V and 220V.

    Explore SVC-1000

  2. 02 · Step-Down Transformer

    ST-1000

    Step-down conversion with two front outlets marked 110V.

    Explore ST-1000

  3. 03 · Step-Up / Step-Down Transformer

    HFM-THG-1000

    110V / 220V conversion with an input voltage selector.

    Explore HFM-THG-1000

Interactive exterior

In the round.

Open an exterior model to inspect the enclosure, controls and connection layout from every side.

SVC-1000 illustrative exterior render

Drag to rotate · Scroll to zoom

Illustrative exterior model. Appearance and configuration may vary by version; check against the current product specification.

Selected product range

36 selected models.
Three series.

Historical catalogue power values by series. Confirm current specifications and availability for your configuration.

View 36 selected models
  1. SVC 11 models AC Voltage Regulators 500W – 20,000W
  2. ST 12 models Catalogue step-up / step-down range 100W – 10,000W
  3. THG 13 models Step-Up / Step-Down Transformers 100W – 10,000W*

Catalogue values are historical reference information, not confirmed current specifications. W and VA are not interchangeable. Each dot is one catalogue model. *THG-7500W is listed in the instructions in VA only.

From requirements to enquiry

Tell us what
you need.

A few details help frame the right conversation. Start with what you know — we can clarify the rest.

  1. 01 · Supply

    Where does power start?

    Your country or region and the voltage of your available supply.

  2. 02 · Equipment

    What does it need to run?

    Equipment voltage, rated power in W or VA, and any known starting requirements.

  3. 03 · Configuration

    Bring the details together.

    Share the model, quantity and plug requirements with your enquiry.

Start a Selection Enquiry

Full product range

46 series. 414 catalogue models.
Reconstructed in 3D.

Voltage regulators, transformers, DC power supplies, inverters, solar controllers, chargers and more, as published in the Goldsource catalogue since 1989. Open any series for illustrative exterior models, catalogue ratings and packing data.

13 seriesVoltage regulators100 catalogue models10 seriesVoltage transformers97 catalogue models8 seriesDC power supplies & converters85 catalogue models7 seriesInverters, charging & backup54 catalogue models1 seriesEducational power supplies10 catalogue models2 seriesTravel adaptors & converters31 catalogue models5 seriesOther catalogue products37 catalogue models

Browse all 46 series

Why Goldsource

Thirty-six years of voltage products.

1989Ningbo Jinyuan was founded in October 1989 as the Yuyao voltage regulator factory. Every catalogue page carries the words “Since 1989”.
Goldsource®A registered trademark of Ningbo Jinyuan (G.S) Electricity Co., Ltd., recorded by the United States Patent and Trademark Office.
PatentsThe catalogue prints Chinese patent numbers for the AVR-W, SVC-WS/WD, ST, TC, TC-B, THG, solar controller, CP and UPS series.
Canton FairGoldsource exhibits at every session of the China Import and Export Fair, including the 140th session in October 2026.

Catalogue values are historical reference information. Current specifications, certifications and availability are confirmed by enquiry.

About Goldsource

A focus on voltage.
A practical point of view.

Explore selected SVC, ST and THG products for AC voltage regulation and conversion. Product views and clear enquiry paths bring your requirements into focus.

Get to know Goldsource

Browse the product catalogue.

Find regulators, transformers, power supplies, travel adaptors and more in the historical catalogue.

Full catalogue directory

Let's talk requirements

The right conversation. The right configuration.

Share your voltage requirements, equipment and quantity.

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