---
product_id: 7465100
title: "ROCKSTONE POWER 1000 Watt Voltage Converter Transformer - Heavy Duty Step Up/Down AC 110V/120V/220V/240V Power Converter - Circuit Breaker Protection – DC 5V USB Port - CE Certified [3-Year Warranty]"
brand: "rockstone power"
price: "฿8815"
currency: THB
in_stock: true
reviews_count: 8
category: "Rockstone Power"
url: https://www.desertcart.co.th/products/7465100-rockstone-power-1000-watt-voltage-converter-transformer-heavy-duty-step
store_origin: TH
region: Thailand
---

# 1000W heavy-duty power 5V USB charging port Dual 110/220V step up/down ROCKSTONE POWER 1000 Watt Voltage Converter Transformer - Heavy Duty Step Up/Down AC 110V/120V/220V/240V Power Converter - Circuit Breaker Protection – DC 5V USB Port - CE Certified [3-Year Warranty]

**Brand:** rockstone power
**Price:** ฿8815
**Availability:** ✅ In Stock

## Summary

> 🌍 Power your world, anywhere — no voltage limits, just pure convenience!

## Quick Answers

- **What is this?** ROCKSTONE POWER 1000 Watt Voltage Converter Transformer - Heavy Duty Step Up/Down AC 110V/120V/220V/240V Power Converter - Circuit Breaker Protection – DC 5V USB Port - CE Certified [3-Year Warranty] by rockstone power
- **How much does it cost?** ฿8815 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/7465100-rockstone-power-1000-watt-voltage-converter-transformer-heavy-duty-step)

## Best For

- rockstone power enthusiasts

## Why This Product

- Trusted rockstone power brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Smart USB Convenience:** Integrated 5V USB port lets you charge your mobile devices alongside your main gear.
- • **Powerhouse Performance:** Handles up to 1000 watts for heavy-duty appliances without breaking a sweat.
- • **Built to Last & Protect:** Rugged metal casing with circuit breaker and fuse protection ensures safety and durability.
- • **Global Voltage Flexibility:** Seamlessly converts between 110-120V and 220-240V to keep your devices running worldwide.
- • **Travel-Ready All-In-One Kit:** Includes US power cord, European adapter, spare fuses, and a 3-year warranty for worry-free global use.

## Overview

The ROCKSTONE POWER 1000 Watt Voltage Converter Transformer is a heavy-duty, dual voltage step up/down transformer designed for global use. It supports 110-120V and 220-240V appliances with a robust 1000W capacity, includes a 5V USB charging port, and features advanced safety protections like circuit breakers and fuses housed in a durable metal casing. Perfect for professionals and travelers needing reliable, versatile power conversion, it comes with essential adapters and a 3-year warranty for peace of mind.

## Description

ROCKSTONE POWER? takes pride in being an industry leader in Quality, Technology and Innovation, our factory is the global leader and one of the largest manufacturers in the industry. Product Features 1000 Watts Heavy Duty Step Up/Down Voltage Transformer Converter. Step Up Voltage from 110-120 Volts to 220-240 Volts. Or Step Down Voltage from 220-240 Volts to 110-120 Volts. Patented Simultaneous 3-Mode Output: 5V USB Port / 120V USA Output Socket / 220V Universal Output Socket. Metal Casing. ON/OFF Switch with LED indicator light. Hardwired heavy-duty insulated power cord with USA Grounded 3-Prong Plug. CE Certified. Full Range Fuse Protection. Full Range Over Current Protection. Purchase Guide ROCKSTONE POWER? Heavy Duty Step Up/Down Transformers aka Voltage Converters, Voltage Transformers, Power Converters, Step Up Converters, Step Down Converters, Dual Voltage Transformers, are meant for worldwide use for all electronics, heavy duty machines, or household & industrial applications. For safety reasons, it?s recommended to use a Voltage Converter / Transformer that's max watts is at least 50% higher than your appliance. For example, if your appliance is rated at 1000 watts, you need to buy a Transformer with a max power of at least 1500 watts or greater. Some appliances, such as heating appliances, power tools, motors, laser printers and TVs, require 2-4 times more watts at start up than the printed rated wattage. What's in the Box - ROCKSTONE POWER? 1000 Watt Heavy Duty Step Up/Down Voltage Transformer Converter - American to European Grounded Schuko Wall Outlet Plug Adapter - 2 PCS Spare Fuses - Instruction Manual Warranty Manufacturer 3-year limited warranty. Please contact us via email if you have any questions.

Review: Functions well under constant load - Ordered this 500 Watt transformer to use an appliance from Korea in the U.S.A. Per the manufacturer, I computed the amount of wattage needed for the appliance and then doubled it. So for example, I computed that my appliance required 210 watts, so I doubled to 420 and rounded up. The appliance I have (from Korea) didn't specify the wattage using "Watt" or "W", but instead said "VA". I believe this is the same or equivalent, but you should check with a qualified electrician if this is the case with your appliance. If your unit shows just Amp or Voltage, you can multiply the two to arrive at Wattage. Again, check with someone who is qualified before using the appliance or ordering a unit so you can ensure you get the correct wattage. My calculations worked well and the appliance has functioned without problems under constant load the entire time without issues at the selected wattage. My understanding is that you'll want to double the wattage due to changes in the flow of electricity and the appliance's peak demands that could exceed the normal wattage used or identified on the back of the appliance. Be careful for laser printers or microwaves (and other high wattage appliances), I believe that can have peak watt use of much greater than their rated wattage. I believe the rule of thumb is to multiply by 3 instead of 2 to arrive at the wattage of transformer you will need. If you live in a country that has inconsistent power delivery, you may consider purchasing a separate unit that regulates the voltage. Some transformers have this built in, but this one does not. If you will be using this transformer in the U.S.A. on a modern electrical circuit, you probably do not need a regulator. I did not purchase one and have had no trouble in the month of so that I've used the unit. The transformer does get warm to the touch, but does not get hot. I expect to unplug and turn off this transformer during vacations and while away from the home for a long period of time, but I believe that this should function well under constant load indefinitely. When you plug in, make sure you select the correct voltage on the back as the removable plug should represent the SOURCE voltage of the electricity that you will be plugging the transformer INTO. In my case, I was using a 220V appliance in the U.S.A. (110V) so I selected 110V on the back and plugged the appliance into the 220V plug on the front. For some reason, I found this a bit confusing so make sure you read the instructions included with the unit. This transformer comes with a quality plug converted for U.S. style plugs (110V) to the European/Asian style (220V) which is useful if you travel internationally and have a dual 110/220V appliance (like cell phones, laptops, etc.). It may come in helpful if you need to convert plugs for the appliance you'll be using with the transformer. In general, the unit feels like it's well made and will be able to withstand a long period of consistent use. The transformer I received was cosmetically damaged during shipment (one corner bent and a few scratches). However I'm hiding this transformer behind some kitchen items so it's not a beauty contest. The unit held up well to shipment and I didn't think the scratches and bent corner warranted a return. As far as the value of the unit is concerned, I'm very pleased with the purchase. This unit appears to be quality and will last quite a while. It was less expensive than similar units and was available for delivery with desertcart Prime. The unit includes a 3-year warranty. With this transformer being used under a constant load 24/7 almost every day, I'm comfortable that all the quality issues with the unit should come out in the first 3 years. Overall: good value, quality unit, and fast free delivery with desertcart Prime. Recommended!
Review: Excellent converter — works perfectly with our European coffee machine! - This converter has been a lifesaver for us. We brought our coffee machine from Europe to the U.S. a few years ago, and thanks to this transformer, we’ve been able to use it every day without any issues. The quality has been great so far, and it hasn’t let us down at all. We’re still enjoying our machine just like back home. Highly recommend!

## Features

- Versatile Voltage Transformation: Seamlessly convert voltages with this dual-purpose power solution. Effortlessly transform 110V to 220V and vice versa, or step up from 120V to 240V and step down from 240V to 120V. Ideal for a range of appliances, this 220v to 110v converter, and 110v to 220v converter ensures your devices operate smoothly in different voltage environments. Safely link multiple devices using a power strip or extension cord, ensuring total wattage within the converter's limit.
- Universal Compatibility & USB Convenience: Equipped to power a variety of devices, this voltage converter features a dedicated 5V USB port for charging mobile devices. With a 110-120V US outlet and a 220-240V universal socket, it's a perfect step-down transformer 220v to 110v and step-up transformer 110v to 220v, catering to both domestic and international electronics.
- Optimal Safety & Enhanced Durability: Enclosed in a robust metal casing, our voltage converter 220 to 110 and 110 to 220 guarantees maximum safety with circuit breaker and fuse protection. Designed to ensure optimal device usage, this converter aids in prolonging appliance life, making it an essential power converter for home and travel. Choose this converter with a wattage rating 50% above your appliance for longevity and optimal performance in power transformer and voltage converter uses.
- RockStone Power proudly supports the United States Military since 2001, and have became a proud supplier for Tesla Inc. since 2018. Shipping is available to all Overseas Military APO/FPO/DPO addresses.
- Comprehensive Package & Warranty Assurance: This all-in-one package includes the Rockstone Power 1000W Voltage Converter Transformer, a USA power cord, European adapter, spare fuses, and a user-friendly manual. Backed by a 3-Year Warranty, it's the ultimate solution for converting voltages like 120v to 240v step up transformer and voltage converter 110v to 220v.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00CLY1WPU |
| Best Sellers Rank | #98,488 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #351 in Power Converters |
| Brand | ROCKSTONE POWER |
| Brand Name | ROCKSTONE POWER |
| Current Rating | 9.09 Amps |
| Customer Reviews | 4.2 out of 5 stars 3,403 Reviews |
| EU Spare Part Availability Duration | 3 Years |
| Global Trade Identification Number | 00617529014595 |
| Included Components | Power converter |
| Item Weight | 13 Pounds |
| Manufacturer | E Depot Express |
| Minimum Frequency | 50 Hz |
| Model | 1000 watt |
| Mounting Type | Fixed Mount |
| Part Number | 1000 watt |
| Power Source | Corded Electric |
| Specification Met | CE |
| UPC | 617529014595 617529014465 |
| Unit Count | 1.0 Count |
| Warranty Description | 3 year manufacturer |

## Product Details

- **Brand:** ROCKSTONE POWER
- **Current Rating:** 9.09 Amps
- **Mounting Type:** Fixed Mount
- **Power Source:** Corded Electric
- **Specification Met:** CE

## Images

![ROCKSTONE POWER 1000 Watt Voltage Converter Transformer - Heavy Duty Step Up/Down AC 110V/120V/220V/240V Power Converter - Circuit Breaker Protection – DC 5V USB Port - CE Certified [3-Year Warranty] - Image 1](https://m.media-amazon.com/images/I/71F+wzxNyQL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: How would i change 220v to 110v? i set the 2 prong plug at the back of machine to 110v. what should i do at the front?**
A: Since you plan to use your appliances (200V-240V) in the United States, please make sure to select 110V from the Input Voltage Selector on the back of the ROCKSTONE POWER Voltage Converter Transformer (The factory default setting is on 240V). Plug the power cord into the U.S. wall/power outlet and switch on the Voltage Converter Transformer without plugging in any appliances. The Power Source indicator red light will turn on. Then, plug your appliance's plug into the 220V output outlet located on the front panel (please use a plug adapter if needed) and switch on your appliance.

**Q: What is the output Hz?**
A: so if I use a double ended bulb  1200w  90 hz it will work perfectly too ??

**Q: How to install fuses?**
A: The fuse holder is on the back of the transformer (above the power cord), please loosen the screw with a screwdriver to replace the fuse if needed. (Package includes 2pcs spare fuses). Please make sure that the fuse and/or the fuse holder is tightened securely when replaced.

**Q: Can this work with 220Watts wet grinder purchased from India?**
A: 220 watts is probably the running current of the wet grinder... the start up current may be higher.   I would try the 1000 watt unit.   And you can exchange it if it has trouble with start up for the 2000 watt model which should have more than enough capacity.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Functions well under constant load
*by C***S on November 29, 2014*

Ordered this 500 Watt transformer to use an appliance from Korea in the U.S.A. Per the manufacturer, I computed the amount of wattage needed for the appliance and then doubled it. So for example, I computed that my appliance required 210 watts, so I doubled to 420 and rounded up. The appliance I have (from Korea) didn't specify the wattage using "Watt" or "W", but instead said "VA". I believe this is the same or equivalent, but you should check with a qualified electrician if this is the case with your appliance. If your unit shows just Amp or Voltage, you can multiply the two to arrive at Wattage. Again, check with someone who is qualified before using the appliance or ordering a unit so you can ensure you get the correct wattage. My calculations worked well and the appliance has functioned without problems under constant load the entire time without issues at the selected wattage. My understanding is that you'll want to double the wattage due to changes in the flow of electricity and the appliance's peak demands that could exceed the normal wattage used or identified on the back of the appliance. Be careful for laser printers or microwaves (and other high wattage appliances), I believe that can have peak watt use of much greater than their rated wattage. I believe the rule of thumb is to multiply by 3 instead of 2 to arrive at the wattage of transformer you will need. If you live in a country that has inconsistent power delivery, you may consider purchasing a separate unit that regulates the voltage. Some transformers have this built in, but this one does not. If you will be using this transformer in the U.S.A. on a modern electrical circuit, you probably do not need a regulator. I did not purchase one and have had no trouble in the month of so that I've used the unit. The transformer does get warm to the touch, but does not get hot. I expect to unplug and turn off this transformer during vacations and while away from the home for a long period of time, but I believe that this should function well under constant load indefinitely. When you plug in, make sure you select the correct voltage on the back as the removable plug should represent the SOURCE voltage of the electricity that you will be plugging the transformer INTO. In my case, I was using a 220V appliance in the U.S.A. (110V) so I selected 110V on the back and plugged the appliance into the 220V plug on the front. For some reason, I found this a bit confusing so make sure you read the instructions included with the unit. This transformer comes with a quality plug converted for U.S. style plugs (110V) to the European/Asian style (220V) which is useful if you travel internationally and have a dual 110/220V appliance (like cell phones, laptops, etc.). It may come in helpful if you need to convert plugs for the appliance you'll be using with the transformer. In general, the unit feels like it's well made and will be able to withstand a long period of consistent use. The transformer I received was cosmetically damaged during shipment (one corner bent and a few scratches). However I'm hiding this transformer behind some kitchen items so it's not a beauty contest. The unit held up well to shipment and I didn't think the scratches and bent corner warranted a return. As far as the value of the unit is concerned, I'm very pleased with the purchase. This unit appears to be quality and will last quite a while. It was less expensive than similar units and was available for delivery with Amazon Prime. The unit includes a 3-year warranty. With this transformer being used under a constant load 24/7 almost every day, I'm comfortable that all the quality issues with the unit should come out in the first 3 years. Overall: good value, quality unit, and fast free delivery with Amazon Prime. Recommended!

### ⭐⭐⭐⭐⭐ Excellent converter — works perfectly with our European coffee machine!
*by A***L on November 19, 2025*

This converter has been a lifesaver for us. We brought our coffee machine from Europe to the U.S. a few years ago, and thanks to this transformer, we’ve been able to use it every day without any issues. The quality has been great so far, and it hasn’t let us down at all. We’re still enjoying our machine just like back home. Highly recommend!

### ⭐⭐⭐⭐ OMG .... most stupid incorrect directions, EVER
*by L***E on December 4, 2013*

I consider myself a fairly intelligent person. My intelligence is well above average. I follow directions well. No, I follow directions exceptionally well. These directions are not only the WORST directions ever written, they are completely wrong. Even though I knew nothing about transformers, while I was setting this thing up, it seemed counter-intuitive. I bought a yogurt maker back from Asia. I was so excited to have finally gotten my shipment of this item in the early afternoon, I ripped open the box and went to work straight-away. Ugh. The dumb directions were so confusingly written, it took me a frustrating few minutes to try to figure it out. I had a 220V item, I needed to convert to 110V. According to the paper, I was supposed to select the input at 220V and plug my appliance into the 110V. It didn't seem right to me, but I plugged it in and set the timer for 8 hours. 10:30 at night the beeper on the yogurt maker sounded. I had seen this appliance being used in Asia, and my stepmother who cannot cook, showed me I just pour in a little yogurt drink and fill it up with milk. I had bought greek yogurt, put in 2/3 of a cup of it and filled the rest with milk. I excitedly opened the jar, and found a lump of yogurt floating in milk. I was confused. Maybe it was because I didn't use a liquid yogurt? But it had the correct bacteria in it, what went wrong? No, it couldn't be the directions to the transformer! Why would they send out wrong directions? The typo should have cued me but instead I re-read the directions, and confirmed I did everything correctly. I Googled how to make yogurt with a yogurt maker. These crazy directions about heating up milk and cooling it came up. But wait, I SAW my stepmother pour liquids and it came out yogurt 8 hours later and there was no heating milk involved. I Googled Rockstone Transformer and descriptions of the item came up. I decided, maybe I didn't add enough starter yogurt, so I added more and started the cycle again. And perhaps this time I should try the output plug that says 220V, as we all know the definition of insanity is repeating oneself expecting a different outcome. I was convinced it was going to start a fire, and my husband asked me if I wanted to move it to the bedroom just in case it did. Yes, because I want us and my wardrobe to burn first!!! Thankfully my last Google search was " How to use a voltage converter transformer" and a Wiki article came up. Now THOSE are properly written directions. The input should have been selected to 110V, because duh we are in America and it's 110V. I Love Wiki; I slept like a baby. Woke up the next morning and voila, yogurt made and apartment not burned down. Long story short, on a low watt item, putting the input in at 220V and using the output 110V is not going to A. ruin the transformer or B. start a fire, but it will definitely not make yogurt. I would have given this 5 stars as it really is a great looking and functional item that's super reasonably priced, however for making me feel like an idiot and wasting 9 plus hours of my time, I'm going to have to deduct. Note to manufacturer, go Google wiki and write proper directions and fix the typo!!! I'm feeling a bit Kathleen Turner/Serial Mom-ish, but what can I say. I'm above average intelligent ;)

## Frequently Bought Together

- ROCKSTONE POWER 1000 Watt Voltage Converter Transformer - Heavy Duty Step Up/Down AC 110V/120V/220V/240V Power Converter - Circuit Breaker Protection – DC 5V USB Port - CE Certified [3-Year Warranty]
- 4 Pack Universal Adapter, Europe to US Plug Travel Adapters (White)

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-04-26*