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Sentronic SEM 7800 Series Magnets

The Sentronic SEM 7800 Series are electrically controlled door-holding magnets.


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The Sentronic® 7800 Series magnet releases when the fire alarm panel enters an alarm condition and the electrical current is interrupted, allowing the door to perform manually until power returns. The tri-voltage design provides 35 pounds of holding force. The magnet is fail-safe and will hold the door until the current is interrupted.

The SEM 7800 Series is protected by a 2-year warranty, meets ANSI/BHMA 156.15 and is UL Listed for metal smoke barrier or labeled fire doors. All magnets in the series feature die-cast housings and are available in aluminum and dark bronze finishes. The SEM 7820 is floor-mounted, the SEM 7830 is surface wall-mounted, the SEM 7840 is low-profile recessed wall-mounted and the SEM 7850 is standard-profile recessed wall-mounted. All magnets but the SEM 7820 are suitable for pocket door installation.

  Heavy Duty

Body Construction

  • Die cast housing
  • Choice of floor-mounted, recessed wall-mounted and surface-mounted wall magnets
  • Heavy-duty design

Quality and Durability

  • Tri-voltage design provides 35 pounds of holding force
  • Magnets are fail-safe until the electrical current is interrupted
  • Performs manually under alarm conditions until power returns


  • Wood and machine screw pack fasteners
  • Armature extensions available
  • SEM 7830, 7840 and 7850 can be used in pocket door installations
  • Tested and certified under ANSI/BHMA A156.15
  • UL listed for metal smoke barrier or labeled fire doors
  • Available in aluminum and dark bronze finishes
  • Standard die-cast cover

The SEM 7800 Series can be:

  • Floor-mounted (7820)
  • Surface wall-mounted (7830)
  • Low-profile recessed wall-mounted (7840)
  • Standard profile recessed wall-mounted (7850)

View the SEM 7800 catalog pages for mounting details and accessories.

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Did You Know?

LCN hardware is tested in a range of temperatures beyond the normal BHMA standards to give customers peace-of-mind.

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As part of Allegion’s family of pioneering brands, LCN benefits from the strength, efficiencies, resources, and integration from a global power. In turn, we pass those advantages on to you.

Allegion helps keep people safe and secure where they live, work and visit. With more than 30 brands sold worldwide, we specialize in security around the doorway and beyond. It’s the power of one.