ASCO ATSS3R-400-1-1 400A Service Entrance Automatic Transfer Switch, NEMA 3R
ASCO 300 Series automatic transfer switch. 400 amp, 120/240V 1PH, 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.