B-Line 30.5 mm, Heavy-Duty Watertight/Oiltight Indicating Light

Yes. The 10250T74NW is a 30.5 mm heavy-duty watertight/oiltight pilot light, so it drops into the standard 30.5 mm (1-3/16 inch) push button hole already punched in most industrial control enclosures. No enlarging or adapter plate needed if the existing hole is 30.5 mm.

It runs directly on 120 Vac. The light unit is an incandescent type with the transformer built in, so you wire it to your 120 Vac control circuit without adding an external transformer. Do not feed it a 240 V or low-voltage control circuit.

The enclosure rating covers NEMA 3, 3R, 4, 4X, 12 and 13, so it handles outdoor rain and sleet exposure, hose-directed water, corrosive washdown, and dust or oil-laden industrial air. That covers food plant washdown panels and exterior control stations, provided the panel itself carries an equal rating and the gasket is seated properly.

PresTest means the lens itself is a push-to-test actuator. Press the white lens and the lamp is fed from the supply side so you can confirm the bulb is good without energizing the monitored circuit. That is how maintenance crews check a burned-out lamp against a machine that is signalling nothing, and it is the reason to pick PresTest over a plain non-test pilot light.

White lens, in plastic. White is the conventional neutral or power-on indication rather than a fault or run state, so it is the one to order for control-power-available and general status. If you need red for stopped or green for running, order the matching color version of the 10250T series instead of this one.

The lens on the 10250T74NW is plastic, which resists impact and chipping better than glass and is normal for 30.5 mm oiltight stations. Where it matters is heat and aggressive solvents: plastic lenses can craze with certain cleaners, so in a solvent-heavy area specify a glass lens version of the 10250T series instead.