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The Draper 121022 MS-3R/MS-4R Momentary 3-Position Key Control Motorized Screen and Lift Switch is a momentary (spring-loaded) key control switch that uses two cam-operated Single-Pole, Single-Throw contact blocks (On-Off), wired to emulate Single-Pole, Double-Throw, Center Off (On-Off-On). The Key Control Switch is designed to work with Draper Projector Lifts and Screens to control Up and Down on the lift or screen. The cover plate is stainless steel and the Switch includes four 6" wire leads: black, black, red and blue (2 commons, down and up).
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