Aprilaire Model 50 Current Sensing Relay – 24V Humidifier Automatic Activation Switch

This is the Aprilaire Model 50, a current sensing relay designed to make your humidifier run smarter.

It automatically turns the humidifier on and off based on the furnace fan operation, so you don’t have to worry about manual switches.

It’s brand new in the box, just like you’d find at the store, and works with 24V systems.

Super easy to install and a solid choice if you’re looking to upgrade or replace an old relay.

Whether you're a DIY homeowner or an HVAC pro, this little gadget takes the guesswork out of maintaining indoor humidity.

It’s genuine Aprilaire quality, and it’s ready to go right out of the box.