8501X NEMA machine tool relays combine a rugged heavy duty design with modular construction for greater flexiblity. They are ideal for applications where long life, high reliability and ease of maintenance are important. This master relay has a 20A contact rating due to use of 8501XC4 master contact cartridges. The 8501XC4 master contacts are rated at 20 ampere resistive current rating at 600 VAC. The contacts also have an A600 inductive contact rating. This relay is supplied with six 8501XC4 contact cartridges. The contact cartridges are installed as normally open contacts. The machine tool relays have straight through wiring. This makes wiring easier. The six plug in contact cartridges in this relay make contact conversion or replacement very easy. Contact conversion or replacement can be done without removing any wiring. Contacts are supplied with pressure wire connectors so wires can be easily terminated. 18 to 12 AWG copper wire can be used with this relay. Relay has a 110/120 VAC 50/60 Hz replaceable coil. Relay is UL listed and CSA certified. Relay is UL listed and CSA certified.