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 relay family offers a complete line of relays and accessories for most control applications. This pneumatic timer attachment can be added to a standard 4 pole relay. This timer attachment comes as standard in the off delay mode but can be converted to on delay. The timer attachment comes with one normally closed and one normally open timed contact. The contacts are the standard 8501XC1 relay cartridges. The timing range of this timer attachment is from 5 to 180 seconds. This timer has screw clamp terminals. This timer attachment is UL listed and CSA certified.