Teledyne Peer AR-420, 20 KVA Spot Welder with Entron Weld Control, SN 800100 Specifications: Capacity @ 50% duty cycle 20 KVA Throat dept 18” Primary volts 220 Frequency 60 hz Secondary volts 2.7 to 4.7 Equipped With: Entron solid state synchronous welding control and Disconnect