Nonreversing vacuum starters are used to switch electric motors where overload protection is provided separately. Vacuum starters have ratings from 135 to 540 amperes. This NEMA 4 starter has a 135 ampere rating. Vacuum starters are available in 3 pole versions. These starters are available with replaceable coil voltages. The coil in this starter is rated for 110/120 VAC 50/60 Hz. This starter doesn't have an enclosure. Enclosures are available. Starter is 13.06 inches tall, 5.21 inches wide and 6.47 inches deep. Accessories are available for vacuum starters. Vacuum starters are UL listed and CSA certified for global applications.