What if the outdoor UPS must be placed near the ocean or at end of a pier? Or, what if the outdoor UPS is located in an area with severe dust and sand storms that can last for days?

Challenging applications like these require a special outdoor UPS with two compartments. In these products, the electronic boards are housed in a separate NEMA 4X-rated compartment while batteries, transformers and the input/output connector are housed in NEMA 3R-rated compartment. This way, possible battery outgassing does not cause accumulation of hydrogen and oxygen, since the batteries are in the ventilated compartment. Plus, wind-blown seawater, dust or sand will not be able to enter the sealed NEMA 4X compartment where the sensitive electronic boards are housed.