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The ATSTZ400/002 is a Spring-Return Time Delay Switch from Indelac Controls. It is designed for use in HVAC and other applications requiring the control of circulating fans, pumps, dampers, burners, and other electrical loads. This switch is capable of handling up to 600 volts AC. It features a variety of preset ranges, adjustable times, normally open and normally closed contact configurations, a lockable actuator, an LED indication, and an electrical interruption indication. It is UL listed, CSA certified, and conforms to NEMA standards.