ASCO ATSS3R-1200-3-4 1200A Service Entrance Automatic Transfer Switch, NEMA 3R
ASCO 300 Series automatic transfer switch. 1200 amp, 277/480V 3PH, 2/3-pole. UL-1008 certified, NEMA 3R outdoor enclosure. Service entrance rated. Includes the 11BE package and 44G strip heater as standard. A NEMA 1 indoor version is available; substitute ATSN1 or ATSSN1 for the enclosure prefix.