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Magnetic Door Holders

Shop magnetic door holders and electromagnetic door releases for commercial and institutional openings. Compare LCN Sentronic SEM 7800 Series hold-open magnets and replacement components by mounting style, profile, electrical requirements and compatibility. Check each listing to distinguish a complete holder from a replacement magnet core or other service part.

For a fire-door magnetic hold-open application, select the device as part of the complete door and release system. Confirm the model, mounting preparation and required electrical connections with the manufacturer instructions and project specifications. Browse LCN door control hardware for related closers and components.
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Choosing Electromagnetic Door Holders and Release Hardware

Electromagnetic door holders keep a door in an open position until the holding magnet releases. LCN SEM 7800 Series magnets hold while energized and release when the electrical current is interrupted. A separate manual door closer controls closing after release. Identify whether the project needs a complete magnetic hold-open device or a replacement component before comparing products. The holder, closer and release controls perform different jobs and need to be considered together for the intended opening.

Start with the mounting arrangement and available space. Surface-mounted and recessed wall configurations require different preparation, and the profile affects how the magnet meets the door-mounted armature. Record the existing model number and compare the manufacturer's mounting drawings, dimensions and required projection with the opening. Check the wall construction, door position and attachment points before selecting a replacement. A similar-looking housing or matching finish is not enough to confirm that the new holder will fit the existing installation.

For a fire door magnetic holder or fire-alarm-controlled release application, verify the exact product's suitability and the planned system connection. Check the specified supply voltage, AC or DC requirements, current draw and release operation for the chosen model. Have the installer confirm the holder, closer, alarm interface and complete opening against the project requirements. A magnetic door release should be selected using its documented application and installation instructions, rather than assuming all electrically controlled holders are interchangeable.

When replacing electromagnetic door holder parts, match the manufacturer, series and component number. A magnet core assembly is a service component and should not be mistaken for a complete door holder package. Review the listing for included armature, housing, mounting hardware and other required components, and identify anything that must be ordered separately. For related closer service work, browse door closer parts and verify compatibility with the closer already installed on the door.

For a new installation or a larger replacement project, prepare a list of the openings, existing equipment and required configurations. Include model numbers, mounting details and photographs where available so the material requirements can be reviewed together. Browse commercial door hardware for the other components needed at each opening, or request a contractor project quote for a coordinated material order. Confirm the complete package and installation requirements before comparing a replacement part with a complete holder assembly.