Industrial-grade panel controls include push-pull, rotary switch designs

BOURNS Industrial-grade panel control models include a push-pull switch and rotary switch. Model 54 is the ½-inch panel control, an extension of Model 51/53 Series with an added double-pole, double-throw (DPDT) push-pull switch module. Model 56 is the ½” panel control and an extension of Model 51/53 Series with an added single-pole, double-throw (SPDT) rotary switch module.

http://www.bourns.com