About The Aprilaire 51 120V Current Sensing Relay The Aprilaire 51 120V Current Sensing Relay (minimum of 4 amps) has a voltage Range between 100125 VAC, 5060 Hz and simplifies the installation of your air cleaner on furnaces that do not have accessory terminals. The Aprilaire 51 120V Current Sensing Relay also works with Honeywell humidifier models HE220, HE225, HE260, HE265, HE360 amp; HE365.
The Aprilaire #51 current sensing relay simplifies air cleaner installation on furnaces without accessory terminals. It can also be used to simplify installation of inline duct booster fans. Voltage Range: 100-125 VAC, 50-60 Hz. Sensing Current: Minimum of 4.0 Amps.