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Aprilaire 51 Current Sensing Relay

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The Aprilaire #51 current sensing relay simplifies air cleaner installation on furnaces without accessory terminals.

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Product Review

The Aprilaire #51 current sensing relay simplifies air cleaner installation on furnaces without accessory terminals.

Voltage Range: 100-125 VAC, 50-60 Hz
Sensing Current: Minimum of 4.0 Amps
It can also be used to simplify installation of inline duct booster fans
Relay must sense all four amps in order for it to open and close properly