Seven Star Step Up and Down Transformer TC500 - Transformer ( External ) - Ac 110/220 V - 500 Watt
(1 Epinions review)
Avoid Seven Star transformers
Jan 12, 2009 (Updated Jan 12, 2009)
Review by bflusche
Rated a Very Helpful Review
Supports multiple input voltages.
Provides simultaneous 110VAC and 220VAC.
Cons:No ground without extra part
No UL certification, manual, warranty, or tech support.
The Bottom Line:
Safe only if the MFV-13 grounded adapter is included. I consider it unethical to sell these in the U.S. without the MFV-13. Look for UL listed transformer instead.
I purchased a Seven Star CT2000 2000 Watt step-up, step-down transformer to transform standard US 110VAC to 220VAC to supply a foreign 220VAC only PC. As there are no other reviews for 7 Star transformers, this review is for the product line in general. The unit is made in China.
Recommend this product?
The CT2000 provides for multiple input voltages (110VAC, 200VAC, 220VAC, and 240VAC) selected via a jumper on the back. The unit has two receptacles on the front, one for 110VAC and one for 220VAC, so it can provide both voltages simultaneously. Other units may have other features.
There is a serious problem with this unit. The power plug is a CEE 7/7 (AKA Type E/F hybrid) compatible with the European Type F or "Schuko". IT DOES NOT FIT STANDARD U.S. SOCKETS !!!
(See en.wikipedia.org/wiki/AC_power_plugs_and_sockets TypeE/F)
Check the product photo and you will see round pins and a small metal receptical where the ground pin should be as well as metal strips down the side. This is a hybrid and compatible with either the European Type E or Type F ("Schuko"). Again it does not fit U.S. sockets. The package usually includes a "universal" adapter to convert the Type E/F hybrid plug to physically fit U.S. Type B sockets, BUT WITHOUT CONNECTING THE GROUNDING PIN !!.
The Seven Star MFV-13 reportedly converts Schuko plugs to U.S. Type B and connects the ground via two metal strips at the top and bottom of the Schuko. The MVF-13 is available from various electrical mail order houses for about $10 + S&H. Typically this is an extra part the user must purchase seperately, and is usually not told about.
Before I found out about the MFV-13, I went ahead and replaced the original power cord with a regular U.S. three wire cord and U.S. Type B plug. The unit seems to work OK and is now properly grounded. Only people knowledgeable about electrical power systems should attempt this otherwise you can miswire it and create new safety problems.
Reviews on other sites have complained about the delivered product having different output sockets than shown in the ad. Be aware that different models have different sockets and the unit pictured in the ad may not be the unit delivered.
The unit has a CE mark, but no UL certification. The installed fuse is rated for 20A at 250V.
Share this product review with your friends
Seven Star 100W Step-up and Step-down Transformer/Converter Seven Star 100W Step-up and Step-down Transformer/Converter Converts Electricity from 220/...
Color: Black Features: Converts from 110-117-120V to 220-230-240V in Step Up Mode or Vice Versa in Step Down Mode Very high capacity shock-proof socke...
Step Up 110V to 220V and Step Down 220V to 110V . Use it with appliances up to 300W. Comes with Factory Warranty! Step Up & Down Transformer 300 Watts...
SquareTrade © AP6.0 THG-300 Voltage Converter Transformer Features: 300 Watt Maximum Capacity Heavy-Duty Voltage Converter / Transformer Dual Step Up ...
100 Watts, Compact Plug-in Type, Converts AC220-240V 50Hz to AC110-120V 50Hz or AC110-120 Volt 60Hz to AC220-240 Volt 60Hz, Universal Socket Outlet ac...
Untitled 5 Seven Star 100 W 100 Watts Up Down Voltage Converter Transformer 110 220 V !!! BRAND NEW !!! HEAVY DUTY Step Up Down Transformer For Contin...
Small and compact size - weighs only 2.9 lbs! size: 5.75 x 3 x 3 Model # SF-200, 200 Watt Step Up/Down AC TO AC voltage converter, Operates on 110/220...
Untitled 5 Seven Star 500W 500 Watts 110-220V Voltage Converter/Transformer up down !!! BRAND NEW !!! Step Up Down Transformer 5 00 Watts SEALED IN OR...
Untitled 5 Seven Star 200W Watt Voltage Converter Transformer !!! BRAND NEW !!! HEAVY DUTY Step Up Down Transformer For Continuous Use 200 Watts SEALE...
Product Details 100 Watt Step Up/Down Travel Voltage Converter Universal Output Socket - Accepts 2 or 3 prong plugs from around the world LED indicato...