The Symcom 460 has a line-line voltage range of 190-480V, the Macromatic PMDU is 190-500V; the Symcom 460 has fixed undervoltage trip of 90%, the Macromatic PMDU is adjustable from 80-95%; the Symcom 460 has adjustable unbalance of 2-8%, the Macromatic PMDU is adjustable from 2-10%; the Symcom 460 has auto reset only while the Macromatic PMDU offers both auto & manual reset; the Symcom 460 has SPDT contacts only while the Macromatic PMDU has DPDT; the Symcom 460 can be both panel-mounted with two screws or mounted on 35mm DIN rail, the Macromatic PMDU is for 35mm DIN-rail mounting (contact Macromatic for information on a panel-mount-only version in quantities).