Degradation sensing and shut-down means for refrigeration motor-compressor units

摘要: Means for continuously shut-down operation of and enclosed motor-compressor unit refrigeration or heat pump service when the refrigerant-oil mixture therein reaches a predetermined degree contamination by conductive particles comprises provision normally closed switch in motor energizing circuit, relay which energized opens switch, immersing pair spaced electrodes mixture, connecting capacitor series across D.C. power source, unidirectional solid state parallel with providing voltage responsive gating means turning on response to charge capacitor, open fusible fuse close high temperature through second circuit.