The 115 V AC control voltage means the coil is energized by a standard 115 V AC supply — common in North American control circuits — and the contactor pulls in when that voltage is applied.
Where it fits and how it mounts
That 36 mm footprint is the key dimension for panel layout — it takes up two 18 mm slots in a typical distribution board. The 71 mm depth means it clears most shallow enclosures, but check your gland plate clearance if the panel is tight. The 4 NO contacts give you four independent switched circuits, all closing when the coil is energized; there are no NC contacts on this variant. The switching capacity for incandescent lamp loads is rated at 2,000 W, which is useful for lighting contactor applications.