135 A NEMA Size 4 — what the rating means on the floor
This ABB A145N4-30-11-84 is a NEMA Size 4 contactor rated 135 A continuous, 3-pole, with a 120 VAC coil. The NEMA size rating means the contactor is built to handle the inrush and thermal demands of motor loads up to that frame size — not just the thermal current, but the mechanical endurance for repeated starts. The NEMA 4 enclosure rating means the contactor body is sealed against hose-directed water and dust ingress, so it can sit in a washdown area or outdoor cabinet without an extra enclosure.
What you need to wire it up
The description explicitly notes you must add two terminal lug kits — the contactor ships without lugs. The 120 VAC coil pulls in on standard control voltage; the 600 V rated main poles handle 480 V and 600 V motor circuits common in North American panels. Wires up clean on a backplate or in a NEMA 4 enclosure — the NEMA 4 rating on the contactor itself means the panel builder can skip an extra enclosure in many washdown or outdoor spots.