"Danfoss oil differential pressure controls are used as safety switches to protect refrigeration compressors against low lubricating oil pressure. Features * Fixed and adjustible differentials available * 240 or 120 V a.c. or d.c. control voltage * Simple manual trip, electrical test function eliminates need of tools and test “jumper” wires * Extremely narrow switch differential accuracy * Reliable, long life stainless steel bellows * Sturdy metal cover and universal mounting hole patterns * Integral 1/2 NPSM swivel cable connector allows direct attachment of 1/2 in. male pipe thread connector * Standard four-wire hook-up * Refrigerants CFC, HCFC, HFC"