a rotary switch having a multiple throw axial cam rotor and operatively aligned detent teeth . one held stationary contact spring spider has plural radially disposed axially - movable cam follower switch contact arms engaging the axial cam , and also has plural detent springs engaging the axial detent teeth . a base has stationary contacts to be selectively engaged by the switch contacts , and a journal post upon which the rotor is rotatable . an externally accessible shaft upon the rotor has a surrounding resilient &# 34 ; o &# 34 ; ring . a housing sealed to the base and bearing upon the &# 34 ; o &# 34 ; ring seals the switch . the switch may be fabricated in dip size and contact configuration .