The Landon Kingsway mercury switches are designed to be used in conjunction with our Free-Fall Fire Valves to provide position sensing or to cut power to oil burner pump motors in the event of a fire.
The unit is available in both a single and three-phase style although the three connections on the three-phase version could be used to control three single-phase devices.
Both versions contain contacts that remain closed while the valve is in its’ normal state (one contact on the single phase, 3 on the 3-phase) and a separate normally open contact that is suitable for sounding an alarm as it closes if the valve lever drops.
Enclosure: Weatherproof grey epoxy coated steel plate. IP65
Dimensions: 139 x 177 x 48mm
Fixing Centres: 102mm
Electrical Entry: 20mm conduit knockout
Contact Rating: 5A, 250v AC max.