Maxi shear magnets offer a relatively high retaining force and at the same time very small size. The magnet holding power is enhanced by counter holding plates placed on the sides and integrated bolt pins.

A MAGS 15000 flat electric magnets are most sutiable for locking doors.
With time delay adjustable 2-6 sec (after cutting voltage).
With Hall sensor.
Flush mounting version.
With counter plate.

15000N - 1530kg holding power.

Fail unlocked operation. Locked under voltage, opens without it.