Fail safe Strike : locked when energized - N/O contact.. Removing the power will automatically allow the door to open.

Fail secure Strike : "open'' state when energized - N/C contact.

Fail Safe Electric Bolt With Magnetic Feature and Timer - Ultra Slim

The new electro-mechanical locking element with built-in magnetic contact is prevented reliably prevent unauthorized access.
Depending on the control an electrically operated locking bolt goes in and out and thus ensures secure access blocking.

LC Bracket for Narrow Door  for Electromagnetic Lock mount 300kg