Danfoss A/S Liquid Level Switchs and Safety Switches RT 280A / 281A

RT 280A and 281A are primarily used as liquid level alarms and safety switches to prevent too high a liquid level in liquid separators. Secondarily, RT 280A and 281A can be used as liquid level regulators where a liquid level differential of up to 40 mm is permitted. RT 280A and 281A used as safety switches to ensure that the max. permissible refrigerant level in flooded evaporators, pump tanks or liquid separators is not exceeded. As liquid level regulators, RT 280A and 281A maintain a constant average refrigerant level in flooded evaporators, pump tanks or liquid separators. Refrigerants:R717 (NH3), R22, etc. Operating ranges for RT 280A: R22 / R717 (NH3): –50 - 0°C. Operating ranges for RT 281A: R22 / R717 (NH3): –30 - +20°C. Ambient temperature: –50 - +70°C. Approvals: CE-approved according to EN 60947-4, -1, EN 60947-5, -1, meet the requirements of VDE 0660. Contact load, AC: AC1: 10 A, 400 V. AC3: 4 A, 400 V. AC15: 3 A, 400 V. Max. short-time AC 3 current: 28 A. Contact load, DC: DC13: 12 W, 220 V. Enclosure: IP 66 to IEC 529. Pressure connection: G 3/8 A with ø6.5 / ø10 mm weld nipple.