The 71B30-01-3-04N is a multi-deck rotary switch from Grayhill's Series 71 line, designed for reliable switching applications with a 0.5–0.75" diameter and 1/4 amp (250 mA) current rating. It features molded-in position terminals, a choice of shaft/bushing diameters (0.125" or 0.250"), and selectable 30° or 36° angles of throw to accommodate various mechanical and electrical requirements. The switch is available in multiple configurations including solder lug terminals, PC board mount, and process-sealed versions, with support for 1 to 12 decks and 1 to 6 poles per deck. Military qualification to MIL-DTL-3786/39 is available for standard variations. These switches are widely used in instrumentation, control panels, and industrial equipment where reliable multi-position selection and compact form factor are essential.