Will it be safe for a 120v. 550w appliance ?

The 1000W transformer is likely fine, but note that some devices (like laser printers) draw a lot of power when they first start up (sometimes 2 or 3 times listed power draw( and you need to allow for that.

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3000W ST-Pro Auto Step Up & Step Down Voltage Transformer Converter, Heavy-Duty AC 110/220V Converter with US Standard, Universal, Schuko AC Outlets & DC 5V USB Port by Goldsource [3-Year Warranty]

3000W ST-Pro Auto Step Up & Step Down Voltage Transformer Converter, Heavy-Duty AC 110/220V Converter with US Standard, Universal, Schuko AC Outlets & DC 5V USB Port by Goldsource [3-Year Warranty]

Product ID: 581290392

Details

Brand
Goldsource
Manufacturer
Goldsource
Specification met
CE

⚡3000W max load capacity

🔄Auto step-up & step-down voltage

🔌4 AC outlets + 1 USB port

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HK$4365

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Description

⚡ Power up globally, plug in effortlessly!

SOFT START SAFETY - Built-in easy start function prevents circuit breaker trips during power surges.
PEACE OF MIND WARRANTY - Backed by a 3-year limited warranty and hassle-free refund policy for ultimate confidence.
POWERHOUSE PERFORMANCE - Handles up to 3000W for heavy-duty appliances without breaking a sweat.
UNIVERSAL COMPATIBILITY - Equipped with US, Universal, and Schuko outlets plus a 5V USB port for all your devices.
SEAMLESS VOLTAGE SWITCHING - Automatically converts 110V to 220V and vice versa—no manual hassle, no downtime.

The Goldsource ST-Pro 3000W Voltage Transformer Converter is a CE-certified, heavy-duty device designed for seamless step-up and step-down voltage conversion between 110V and 220V. Featuring a 3000W maximum load capacity, four versatile AC outlets including US, Universal, and Schuko standards, plus a 5V USB port, it supports simultaneous use of multiple devices. Its soft-start circuit ensures safe power-up without tripping breakers, making it ideal for high-power household appliances. Certified and backed by a 3-year warranty, this transformer is a reliable solution for international power needs.

Specifications

ASIN	B07KGMK47S
Best Sellers Rank	#124,129 in Electronics ( See Top 100 in Electronics ) #1,220 in International Power Adapters
Brand Name	Goldsource
Customer Reviews	4.3 4.3 out of 5 stars (138)
Manufacturer	Goldsource
Maximum Frequency	60 Hz
Minimum Frequency	50 Hz
Model	ST-Pro 3000W
Part Number	ST
Specification Met	CE

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HK$4365

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

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