The J7MC-3R-E63 is a 3-pole manual motor starter with a built-in circuit breaker, rated for line voltages from 200 to 690 VAC. The rotary-switch mechanism provides the breaking capacity, so this unit serves as both a disconnect and an overload protector in a single enclosure — one less component to panel-mount and wire.
The 200-690 VAC range covers common low-voltage motor circuits worldwide — 208/230/460/575 V in North America and 400/690 V in IEC markets. The 3-pole construction matches three-phase motor feeds.