Eaton 10250TA16 30.5 mm, Heavy-Duty Pushbutton Operator

That is exactly what it is built for. The operating mode is latched by a padlockable attachment in the down position, operated by hand, so once the red button is pushed down it stays down and accepts a padlock to keep the circuit open while someone works on the machine.

Yes. The 10250TA16 carries NEMA 3, 3R, 4, 4X, 12 and 13 performance ratings, which covers rain and dust outdoors, hosedown and corrosion-resistant 4X duty, and oil-tight industrial panels indoors.

The 10250TA16 is an operator only, the red plastic button with its chrome bezel and the padlockable latching attachment. Contact blocks are the separate half of the 10250T system and are selected by the number of normally open and normally closed poles your control circuit needs, so plan to order those along with it.

No, it is non-illuminated. The red colour is the only indication, so if you need the button itself to light up when the circuit is live you need an illuminated 10250T operator and its lamp instead.

Use the padlockable pushbutton where an operator needs to stop the machine and lock it out at the control panel, since it latches down by hand and takes a padlock. It is still a control device switching contact blocks, not a line disconnect. If you need maintained two or three position selection without a lock, a 10250T selector switch operator is the better fit; if you need to break incoming power, that is a disconnect switch, not this.

The actuator is plastic with a chrome bezel, and the operator is rated NEMA 4X, which is the corrosion-resistant washdown rating. For a chemical or coastal panel that combination is appropriate; where the button takes repeated impact or abuse, a metal actuator version of the 10250T operator is the tougher pick.