Mini 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.

MAGS 5700 flat electric magnets are most sutiable for locking doors.
Flush mounting version.
With counter plate.

5700N - 581kg holding power.

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