LCN SEM7850 Standard Profile R...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$563.00
$338.13

LCN SEM7850 Standard Profile Recessed Wall Mount Heavy Duty Door Holding Magnet - Powder Coat Finish

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Model: LCN-SEM7850
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$563.00
$338.13
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SEM 7800 Series Magnets

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.

FEATURES

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

Installation
  • Wood and machine screw pack fasteners
  • Armature extensions available
  • SEM 7830, 7840 and 7850 can be used in pocket Door installations

Specifications
  • Tested and certified under ANSI/BHMA A156.15
  • UL listed for metal smoke barrier or labeled fire doors

Designs and Finishes
  • Available in aluminum and dark bronze finishes
  • Standard die-cast cover

Mounting/Arm Options The SEM 7800 Series can be floor-mounted (7820), surface wall-mounted (7830), low-profile recessed wall-mounted (7840), and standard profile recessed wall-mounted (7850). View the SEM 7800 catalog pages for mounting details and accessories.

Product Specs

Series:
SEM 7800 Series
ADA Compliant:
Yes
Mounting Detail:
Surface - Magnet
Warranty:
2 Year
BAA Qualified:
Yes
Subcategory:
Fire and Life Safety Closers
Product Group:
Door Controls
Product Subgroup:
Electromagnetic Door Holder / Releases
Product Type:
Door Magnets
Door Type:
Interior Door
Finish Type:
Powder Coat
Commercial/Residential:
Commercial
Electronic:
Yes
Product Model:
SEM7850
Product Voltage:
12V/24V/120V
Mounting Method:
Wall Mount
Product Projection:
6-3/4"
Product Category:
Door Controls

LCN LCN-SEM7850 – Frequently Asked Questions

1) What is the LCN SEM7850 door holding magnet used for?
The LCN SEM7850 is a heavy-duty electromagnetic door holder designed to keep commercial doors open. It mounts flush in the wall and holds doors at predetermined positions. The unit releases automatically when fire alarm systems activate.
2) What door weights and widths does this magnet accommodate?
The SEM7850 handles heavy commercial doors up to standard institutional weights. Verify your specific door weight and width against manufacturer specifications. Most standard commercial hollow metal and wood doors are compatible.
3) Does this work with both left and right hand doors?
Yes, the SEM7850 is field-reversible for both left-hand and right-hand door installations. The armature plate can be positioned for either swing direction during installation.
4) What finish does this door holder come in?
The SEM7850 features a durable powder coat finish. This provides corrosion resistance and maintains appearance in high-traffic commercial environments.
5) What is the holding force of this electromagnetic door holder?
The SEM7850 provides heavy-duty holding force suitable for commercial applications. Check the manufacturer's specifications for exact holding force ratings based on your door weight and installation requirements.
6) Does this meet fire safety code requirements?
Yes, the SEM7850 releases automatically when connected to fire alarm systems. It meets requirements for fire-rated door assemblies when properly installed. Verify local code compliance with your AHJ.
7) What accessories are needed for installation?
Installation requires the armature plate that mounts to the door, electrical connections to building power, and fire alarm system integration. Template and fasteners are typically included. Verify all components before installation.
8) How is this door holder installed in the wall?
The SEM7850 requires a wall cutout for recessed mounting. Use the manufacturer's template for precise positioning. Electrical connections are made to building power and fire alarm systems by qualified electricians.
9) What maintenance does this electromagnetic door holder need?
Minimal maintenance is required. Periodically clean the magnet face and armature plate of debris. Test release function monthly with fire alarm system. Check mounting fasteners and electrical connections annually.
10) Are there other LCN door holder models available?
Yes, LCN offers various electromagnetic door holders including surface-mount and different holding force ratings. The SEM series includes multiple models for different applications and door weights.
11) What wall construction is required for this recessed unit?
The SEM7850 requires adequate wall depth for recessed mounting. Verify wall construction can support the cutout and unit weight. Steel stud walls may need reinforcement. Check structural requirements before cutting.
How fast can I get the LCN LCN-SEM7850 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the LCN LCN-SEM7850 come with a warranty?
Absolutely. The LCN LCN-SEM7850 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the LCN LCN-SEM7850?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the LCN LCN-SEM7850 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.