4000 Watt Step Up/Step Down Whole Home Transformer – Convert 110-120 Volt Households to 220-240 Volts and 220-240 Volts Households to 110-120 Volts ADUH-4000


Whether you’re relocating overseas or across the border, east to west or west to east, ACUPWR has you covered. Our step up/step down, all-in-one whole home transformer/voltage converters can power your entire home, business, warehouse, even a small factory. Use it anywhere that uses the 110-120 and 220-240 voltage standards.

  • Made for home, commercial, and industrial use
  • Combination step up/step down model converts voltage from 220-240 volts to 110-120 volts and from 110-120 volts to 220-240 volts via built-in switch
  • ACUPWR products are trusted by military, NASA, and government agencies worldwide
  • Whole home model designed to power entire homes, businesses, small factories, and small warehouses
  • Knock out box housing allows for direct wiring to a circuit breaker
  • Hard-wire installation required
  • ACUPWR products are trusted by military, NASA, and government agencies worldwide
  • Thermal protection with automatic shutdown when overheated (and automatic reset when cooled)
  • Can handle up to 120 percent wattage beyond stated rating (industry standard is only 50 percent)
  • Proudly made in the USA
  • Rated at 4000 watts
  • CE approved
  • 55.5 lbs; Dimensions (W x H x D): 6.25” x 10” x 7”
  • Lifetime warranty with up to $10,000 damage insurance
  • Bench tested for quality assurance and years of reliability 

ACUPWR’s ADUH-4000 model is a grounded step up/step down transformer that will convert voltage from 110-120 volts to 220-240 volts and from 220-240 volts to 110-120 volts. Rated for 3000-watt loads, the ADUH-4000 is a whole home transformer with knock out box housing. It is intended to be directly wired to a circuit breaker and thus power the entire home. Direct wiring is required for installation: The ADUH-4000 does not come with a plug or output receptacle. Depending on how the unit is hard-wired (see instructions) it will convert from 110-120 volts to 220-240 volts, and vice-versa.

As with all ACUPWR products, the ADUH-4000 is proudly manufactured in the USA using the best materials available. This includes copper wiring that allows the ADUH-4000 to operate under heavy duress, and in the most heavy-duty situations. Unlike less expensive, foreign-made products using aluminum wiring, our products are designed to last for decades. Each unit is hand assembled in our factory and bench-tested at a full-load (the maximum stated wattage) to ensure years of dependability. Among the ADUH-4000’s features is thermal protection and will turn off when overheated.

ACUPWR stands by its products by providing a lifetime warranty and insurance coverage up to $10,000. We count military and government agencies, including NASA’s Goddard Space Flight Center, among our customers for good reason: ACUPWR products are the best-made, most dependable, and most long-lasting transformers available.

When considering which model ACUPWR transformer/voltage converter is best for your needs, keep in mind that our products are safe for continuous power at 120 percent beyond the stated wattage, unlike other products that adhere to an industry standard of 2-3 times higher than the appliance’s stated wattage. So, for example, an appliance rated for 300 watts of consumption would, according to the industry standard, require a 900-watt transformer. With an ACUPWR transformer, you can safely use your 300-watt appliance with a 300-watt transformer/converter; our products, remember, can handle 120-percent beyond their stated wattage handling ability.

ACUPWR recommends that you purchase our Global Surge Protector to protect your appliances from voltage spikes. Additionally, our Global Surge Protector allows you to plug in up to 6 appliances using any plug type, thus ensuring its use anywhere in the world. We also highly recommend our voltage stabilizers/line conditioners, in countries where the line voltage is particularly unstable.

Don’t see what you’re looking for? We’ll make a customized voltage transformer specifically for your needs. Call us at 212-380-1191 to discuss further.

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