30 Amp Transfer Switch 120 VAC automatic switchover, 30 second delay. Pigtail leads. Heavy duty relays prevent contact damage during high current transfer operation. Quick change circuit board is easily replaced in the event of a failure. No need to disconnect and re-install the entire unit. Time delay circuit board ensures generator voltage is at proper level before transfer occurs. Protective cover easily snaps on or off. Handy wiring schematic mounted inside the cover. Built-in strain reliefs allow the installer to simply push the branch circuit wires inside the unit for connection. Eliminates the need to purchase and install separate strain reliefs for each circuit.