TS1-470 consists of an encapsulated mercury switch mounted on a 1" damper crank arm. It is mounted on a horizontal damper shaft to provide opened/closed indication. Switch contacts are normal when the cable end of the switch is horizontal or above, and makes when the cable end drops more than 15 degrees below horizontal. The switches are ideal for building automation systems (BAS) and HVAC applications.
National Energy Control Corporation sells the Smartparts TS1-470 SPDT Damper End Switch.