The Aprilaire #51 current sensing relay simplifies air cleaner installation on furnaces without accessory terminals. Can also be used to simplify installation of inline duct booster fans. Voltage Range: 100-125 VAC, 50-60 HzSensing Current: Minimum of 4.0 AmpsOperating Ambient Temperature Range: 40F-104FWire Lead Length: 32"Dimensions: 1" x 1-7/16" x 2-3/4"Load Ratings: Max (50 Watts) 0.42 ampsMin (3 watts) 0.03 amps Case Color: Yellow
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