8501X NEMA machine tool relays combine a rugged heavy duty design with modular construction for greater flexibility. They are ideal for applications where long life, high reliability and ease of maintenance are important. The 8501X NEMA machine tool relay has a variety of attachments to improve its flexibility. This mechanical latch attachment holds all contacts in the relay switched even after the removal of power from the latching coil. This latch attachment provides sequence memory in the event of power loss. This attachment is often used for press control, process control and punch press applications. Latch attachment has a continuously rated 110/120 VAC 50/60 Hz replaceable unlatching coil, which means no coil clearing contacts are required. This latch attachment is UL listed and CSA certified.