| Genuine Aprilaire 51 Current Sensing Relay 120V |
 The Aprilaire 51 current sensing relay is used to turn any humidifier on when the indoor blower of the air handler is energized. The relay makes installing any humidifier easier than ever before. Designed to be installed in series with the 120 volt circuit. Supplemental Information: Installation Guide for Models 50 and 51 Current Sensing Relays Related Products: Aprilaire 800 Steam Humidifier Aprilaire 700A Humidifier Aprilaire 4040 24 Volt Solenoid Valve Price: 36.99 |