838-3 - 838-3 armature plate


While power is applied, these devices hold the door open to permit free passage. When triggered, they release, allowing the door to shut. The hold-opens may be linked to a fire alarm system to close automatically in case of emergency, preventing the spread of smoke through the building.


Hold opens are supplied with the 838-3 armature plate. The armature plate is morticed into the door and engages with the magnetic hold-open.


Armature plate for use with all M838 series hold opens. Surface mounted. Fully adjustable for extreme angles between door and magnet.