Draper Momentary Key Switch

The SP-KSM is Draper's momentary key switch: a three-position key switch that drives the screen only while the key is held over, and stops the moment it is released. That behaviour is deliberate - it keeps an operator watching the surface while it moves, which is what you want on a lift or a large screen in a room full of people.

Two cam-operated single-pole, single-throw contact blocks are wired to emulate a single-pole, double-throw switch, with centre off. The stainless steel cover plate measures 2-3/4 by 4-1/2 inches and fits a standard single-gang box in place of a rocker switch. It is UL recognised and CSA recognised, and it supports low-voltage or multiple-switching installations.