Power disturbances damage air conditioner compressors without warning. Let the Compressor Defender™ take the hit so air conditioners are never interrupted. The all-in-one Compressor Defender device protects compressors and circuit boards in residential and light commercial applications from brownouts, surges, and short cycles. The protective device can be installed inside a condensing unit or on an outdoor compressor. It is also compliant with the AHRI standard 110-1012