The 71BS30-04-1-12S-C is a Series 71 multi-deck rotary switch designed for manual input and function selection. This model features four decks, one pole per deck, 12 positions, and continuous rotation. It is built with a 1/4-inch diameter shaft and includes a shaft and panel seal for enhanced durability in various environments. Electrically, the switch is rated to make and break 125 mA at 30 Vdc and features non-shorting, wiping contacts with a life expectancy of 25,000 cycles at rated load. Its robust design makes it suitable for applications such as test equipment, communication systems, and industrial controls.