Graybar Electric Supply or almost any electrical distributor will have emergency stop pushbuttons. They are commonly used in industry on machine tools. However, most operators are momentary contact pushbuttons and you need a button with maintained contacts, that won't open when you release the button.
Specifically, you can ask for a Square D catalog #XB4BT42 Red Mushroom Head Push-Pull Emergency Stop Pushbutton Operator. The list price is $30. See link below...
Quote:
Originally posted by Jeff Waegelin
Anybody know where I could get a big red button? We want one for our control board, but haven't found one yet.
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Square D catalog #XB4BT42 Red Mushroom Head Push-Pull Emergency Stop Pushbutton Operator