Solid State PTC Heaters. Quick-Connect Terminals. Shock & Vibration Resistant. Mounts in any position. Applications: Electric Furnaces, baseboard heaters, duct heaters, suspension heaters, recreational vehicle blower and element control, heat pump blower and heating element control, motor speed switching in air conditioning ( high speed ) / heating systems handle combination motor and heater element loading in the heater function, , as well as control circuts requiring definite sequence on both start up and shut down.