Littelfuse 201A-AU Monitor Freon preventing catastrophic compressor failure or

preventing catastrophic compressor failure or heat-related equipment damage

extending the service life of the single phase condenser motor

Its primary function as a crankcase pressure regulating valve (CPR) is to throttle vapor flow automatically until the compressor can safely handle the load

ensuring the unit maintains its SEER and EER ratings without restricting the exhaust path

Littelfuse 201A-AU Monitor Freon preventing catastrophic compressor failure orThe Littelfuse 201A AU is a critical 3 phase voltage monitor engineered to safeguard motors from catastrophic power line faults. This auto ranging motor protection relay operates within a wide 190480 V AC window at 50 60 Hz, making it a standard choice for HVACR contractors managing various system sizes. Using proprietary microcontroller based circuitry, the unit provides continuous phase loss protection, voltage unbalance detection, and monitoring