Quick verdict
For UPS critical power in a rack, the first decision is input voltage and how much cosmetic wear you can accept. If your gear runs on 200-240V, the Eaton 5P1550GR is the cost-focused pick: it packs 1550VA/1100W into a 1U chassis at a lower listed price. If your rack uses 120V, the W Box OE-RCKMT1500 is the convenience-focused pick, with more outlets and a cleaner condition story. Both deliver pure sine wave, so the choice comes down to whether you need higher-voltage input and budget savings, or standard-voltage support and a more complete package.
How they compare
| Feature | Eaton 5P1550GR | W Box OE-RCKMT1500 |
|---|---|---|
| Listed price | USD 174.99 | USD 420.00 |
| Condition | Used | New - Open box |
| Capacity | 1550VA / 1100W | 1500VA / 1050W |
| Input voltage | 200V-240V | 120V |
| Form factor | 1U rackmount | 2U rackmount or tower |
| Waveform | Pure sine wave | Pure sine wave |
Where each product wins
The Eaton wins for higher-voltage racks and tighter budgets. It supports 200V, 208V, 220V, 230V, and 240V inputs through a C14 inlet, and its capacity rating is slightly above the W Box. If you want maximum capability for the money and can handle some surface wear, this is the one to beat.
The W Box wins for 120V racks and anyone who prefers a unit that has not been used. It adds line-interactive AVR, eight surge-and-battery outlets, and an integrated LCD. That makes it the stronger choice when condition and convenience matter as much as price.
Product notes
Eaton 5P 1550VA 1100W 1U Rackmount UPS Pure Sine Wave 5P1550GR 200V-240V
If your rack runs on 200-240V, start here. The Eaton is listed at USD 174.99, which makes it the lower-cost path to 1550VA/1100W of pure sine wave backup in a 1U chassis. It handles 200V, 208V, 220V, 230V, and 240V inputs through a C14 inlet and includes the lead-acid battery. The tradeoff is condition: it's a used unit with light scratching and scuffing, and software, a user guide, and accessory cables are not included. If a cosmetically clean unit and a complete kit matter more than saving money, this Eaton will feel like a compromise.
W Box Technologies OE-RCKMT1500 1500VA/1050W Rackmount UPS - Open Box New
For a 120V rack, this W Box is the one to beat if you want a unit that has not been used. It's listed at USD 420.00, but you get a new, unused unit in opened packaging, with original accessories such as rackmount ears. The 1500VA/1050W output is pure sine wave, and the UPS adds line-interactive AVR, eight surge-and-battery outlets, and an integrated LCD for status. It can be mounted in 2U or stood on a shelf as a tower. The limitation is the price gap: it costs about $245 more than the Eaton, and it's rated for 120V input, so it won't serve a 200-240V rack. If condition and completeness are your priorities, that extra cost is reasonable.
Final choice by use case
Choose the Eaton when the lower listed price and higher-voltage input match your rack needs. Choose the W Box when a 120V rack and a complete, unused unit matter more than the price difference. If your rack is built around higher-voltage gear, the Eaton is the practical pick; if it's a 120V setup that values convenience, the W Box is the one to take.
