B-Line 10250T20KY 30.5 mm, Heavy-Duty, Assembled Selector Switch

Yes. The 10250T20KY carries NEMA 3, 3R, 4, 4X, 12 and 13 ratings, which covers rain and sleet outdoors, hosedown and corrosion-resistant duty, and dust or dripping oil in an industrial plant. It is suited to a washdown line or an outdoor pump panel provided the enclosure itself carries the same rating.

Contact configuration is 1NO-1NC, so one circuit closes and one opens as the knob is turned. That is enough for a two-position hand/off, run/stop, or local/remote selection where one contact energizes a coil and the other breaks an interlock or indicator circuit. If you need two independent circuits made at once, you need a selector with a 2NO or 2NO-2NC block instead.

Two positions, with a 60 degree throw between them. Practically, that is a short quarter-ish sweep of the knob from one position to the other, typical of a hand/off or on/off selection. If your drawing calls for a three-position hand-off-auto selector, this is the wrong part.

It ships as an assembled selector switch: yellow knob operator plus the 1NO-1NC contact block as one catalog number, 10250T20KY. You are not building it up from a separate operator and contact block, which is what you would do if you were ordering 10250T parts individually.

Yes, as far as the hole and the family go. The 10250T20KY belongs to the 10250T 30.5 mm heavy-duty line, so it uses the same panel cutout and the same legend plate arrangement as the rest of the 10250T buttons and selectors already in that panel. What will stand out visually is the color: this actuator is a yellow knob, so if the existing operators are black knobs the new one will read differently on the door, which is often exactly what you want for a caution or override function.

The 10250T20KY uses a knob actuator, meaning anyone can turn it. Use it where the selection is part of normal operation and you want it changed freely by line staff. Where the selection needs to be restricted, for example locking a machine into a maintenance mode, specify a key-operated 10250T selector instead so the position can only be changed by someone holding the key.

Non-illuminated. The yellow knob is a plain mechanical actuator with no lamp behind it, so there is no bulb, lamp module, or control transformer tap to specify. If you want the operator to indicate state visually, add a separate 30.5 mm indicating light rather than looking for an illuminated version of this knob.