ASCO ATSN3R-400-3-3 400A Standard Automatic Transfer Switch, NEMA 3R
ASCO 300 Series automatic transfer switch. 400 amp, 120/240V 3PH, 2/3-pole. UL-1008 certified, NEMA 3R outdoor enclosure. Includes the 11BE package as standard. A NEMA 1 indoor version is available; substitute ATSN1 or ATSSN1 for the enclosure prefix.