Allen Bradley Guardmaster 440T Säkerhetslåsbrytare Med nyckel, Rostfritt stål, Förregling

The 440T-MRKSE110A rotary switch unit is single key and has 2 NO & 2 NC contacts, 20 Amp current, and M20 conduit entry.

A trapped key interlock is a simple sequential mechanical safety system for machine guards whereby a removable key is trapped in a control device while the power supply is running. Only when the power supply is turned off can the key can be rotated in the lock and withdrawn. While it is removed the power supply is isolated, ensuring that the machine cannot be restarted while the guard door is open. The key can then be used to release the machine guard door, allowing access to the machinery. After the guard door is closed it can be removed and inserted back into the original control device, thus allowing the power supply to be activated again. Trapped key interlocks can withstand harsher environments than electrical interlocks and are often used in industrial settings where serious risk of injury can occur to machine operators.