Review on JMAF Mushroom Safety Switch for Emergency Situations by Nathaniel Collins

To control the main shutdown (painless #30204) in my racing car. The normally open and normally open positions are isolated, which is the correct configuration for an emergency stop (one contact disables the machine, the second contact sets off an alarm). I don't need this for my application (the main shutdown was via the orange pins), but it's good to see that it's a properly designed emergency stop. I was pleasantly surprised considering I paid about $7 for two. It's not UL recognized or anything, so don't install it at work. Works great, good tactile feel, we'll see how they hold up over time (think I have a spare if I ever need one)