Automatically switches from power cord to generator. Heavy duty relay assembly will handle 100 amp shoreline utility power and up to a 24KW generator. 120-240 vac, 100A per pole. Transfers two hot poles and neutral simultaneously. 22030 second nominal time delay allows generator to get up to speed, time delay can be switched off for instant switching. Heavy duty terminal blocks for easy wiring. Shore power pass through utilizes a micro switch on the neutral relay to ensure neutral lines are engaged before hot lines. DC coiled relays reduce hum and terminal blocks simplifiy wire connections. Quick, easy installation. Automatic transfer switch, 100A 120/240V relay based with terminal strip.