Janco rotary selector switches are complex, miniaturized electromechanical systems capable of a wide range of truth-table logic functions while interfacing AC or DC power up to 10 Amperes to inductive and resistive loads. They offer configurations with multiple decks, multiple poles per deck, concentric and axial motions, and a number of separate microswitches.
Rotary switches offer specific design and performance advantages for direct-power switching: compared to microelectronic controls driving banks of relays, they are more compact, weigh less, reduce circuit complexity, and increase reliability.
When hand actuated, they also give the operator immediate tactile feedback that a function is locked in, with no need for visual confirmation. In busy environments and emergency situations, this feedback can be life saving.