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lube oil control time delay circuit is de-energized when the current flow in the motor supply line drops below 0.5 amperes. In a typical application, the lube oil control does not lock out when the control circuit shuts off the compressor. However, if the compressor overheats and the internal thermal overload circuits open, the compressor shuts itself down, which causes the oil pressure to drop. This drop in oil pressure will energize the lube oil control heater (P28, P45) or timer (P445), causing a nuisance lockout. In this situation, the R310 switch senses the lack of current to the motor, and is used to de-energize the time delay heater (P28, P45) or electronic timer (P445) before a nuisance lockout occurs. Selection chart Product Code Number Description R310AD-1C Current Sensing Switch Voltage switching capacity: 0 to 30 VAC Used with: P445 Electronic Lube Oil Control R310AE-2C Current Sensing Switch Voltage switching capacity: 120 to 240 VAC Used with: P28 and P45 Electromechanical Lube Oil Controls Technical specifications Table 217: R310A Series Current Sensing Switch technical specifications R310A Series Current Sensing Switch Switch Action SPST, normally open R310AD-1C 0.5 to 200 Amperes Current Sensing Range R310AE-2C 0.75 to 200 Amperes R310AD-1C 0.5 Amperes Switch Threshold R310AE-2C 0.75 Amperes Sensor Supply Voltage Induced from monitored conductor, isolation 600 VAC RMS R310AD-1C 0.1A at 30 VAC/DC Switching Capacity(General Purpose) R310AE-2C 0.5 at 250 VAC/DC Output Polarity Non-polarity sensitive output Enclosure NEMA 1 Ambient Operating Conditions 5 to 140°F (-15 to 60°C);0 to 95% RH, noncondensing Ambient Storage Conditions -40 to 158°F (-40 to 70°C);0 to 95% RH Dimensions (H x W x D) 2.34 x 1.85 x 0.875 in.(59 x 46 x 22 mm) Sensor Hole Size 7/10 in. (17 mm) Diameter Agency Listings UL Guide NRNTcUL Guide NRNT7 192 Refrigeration Products Catalog

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