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10.12.2009, 11:18 PM
Most likely what you have there are redundant supplies, so if one fails, there are two others to take over withoout the server shutting down. All three may also be used to share the load, but I suspect it's more for redundancy.
Most likely, the part in the top pic is what actually converts the AC to DC, the item in the bottom pic is just a distribution module.
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