“Compressor Burnout Protection!” When a refrigeration compressor shuts down or enters a long-off cycle, liquid refrigerant migrates into its crankcase oil.  Lubrication decreases and crankcase burnout can occur when operation resumes.  Energy efficient, self-regulating design automatically varies output to maintain adequate oil temperature while permitting wrapping and crossover without burnout. Handles compressors up to 5 Hp, 120 or 240 volt applications. Fits all crankcases with circumferences smaller than 49″.

Output @ -18°C (0°F): 60W | Output @ 16°C (60°F): 35W