Dell's PowerVault line covers several data storage and backup devices.
The PowerVault brand from Dell encompasses directly-attached disk enclosures (like the MD1000 series and MD3000 series), network-attached storage devices (like the NX series), iSCSI and Fibre Channel disk enclosures (like the MD3000i series and MD3000f series), and a range of data backup products (like the DL400 disk backup appliance or ML6010 tape library).
Since Dell acquired EqualLogic, they have used the EqualLogic brand for their high-end data storage offerings and retained PowerVault for their low- and mid-range products.