Safety Relay
We use safety relays/magnetic on-off relays in many places; these prevent that a machine powers back on after a power loss. It also prevents power after someone pressed the emergency button. And ensures the power is turned off after pressing that button, an overheat/overload or lock-out situation.
Most are a variation of the Large Stationary Grinder or the Cirkelzaagtafel SCM L'Invincible / Large tablesaw circuit. Or are based on a product such as: https://www.hydrauliek24.nl/motor-beveiligingsschakelaar-7-10-a:
Some of the small machines use a 4 or 5 pin `on-off' button such as https://www.amazon.de/-/en/Hefddehy-Waterproof-Magnetic-Button-220-240V/dp/B0BYNGHLJ5/ref=sr_1_10 or https://www.amazon.de/-/en/KEDU-KJD17-Flush-Mounted-Switch-Voltage/dp/B07956F8TN/ref=d_pd_day0_sccl_2_1/257-4034223-4086038
These are wired as thus:
