LCN SEM7820 SEM7820 Floor-Moun...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,045.00
$692.20
LCN SEM7820 SEM7820 Floor-Mounted Electromagnetic Door Holder with 35 Pound Holding Force and Tri-Voltage Design

LCN SEM7820 SEM7820 Floor-Mounted Electromagnetic Door Holder with 35 Pound Holding Force and Tri-Voltage Design

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Model: SEM7820-689
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,045.00
$692.20
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LCN SEM7820 Floor-Mounted Electromagnetic Door Holder with 35 Pound Holding Force and Tri-Voltage Design

Professional Fire Safety Door Control Solution

The LCN SEM7820 is a floor-mounted heavy duty door holding magnet from the Sentronic 7800 Series, engineered for fire safety applications. This fail-safe magnetic door holder provides 35 pounds of holding force through tri-voltage design (12V/24V/120V) and automatically releases when fire alarm systems interrupt electrical current. Features die-cast housing construction with powder coat finish and meets ANSI/BHMA A156.15 standards with UL listing for metal smoke barrier and labeled fire doors.

Professional Features & Benefits

  • Heavy-Duty Holding Force: Tri-voltage design delivers 35 pounds of holding force for reliable door positioning in commercial applications.
  • Fail-Safe Fire Safety Operation: Automatically releases when electrical current is interrupted during fire alarm conditions, allowing manual door operation until power returns.
  • Flexible Power Options: 12V/24V/120V tri-voltage operation accommodates various system requirements for versatile installation.
  • Durable Die-Cast Construction: Heavy-duty die-cast housing with powder coat finish provides long-lasting performance in demanding environments.
  • Floor-Mounted Design: SEM7820 floor-mounted configuration with 6-3/4" projection offers versatile installation options for various door and frame configurations.
  • Fire Door Compliance: UL listed for metal smoke barrier and labeled fire doors with ANSI/BHMA A156.15 certification for code compliance.
  • Professional Installation Hardware: Includes wood and machine screw pack fasteners with optional armature extensions available for custom applications.
  • Manufacturer Warranty: Protected by 2-year warranty for added confidence and protection.

Technical Specifications

  • ADA Compliant: Yes
  • BAA Qualified: Yes
  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Door Type: Interior Door
  • Electronic: Yes
  • Finish Type: Powder Coat
  • Mounting Detail: Surface - Magnet
  • Mounting Method: Floor
  • Product Category: Door Controls
  • Product Group: Door Controls
  • Product Model: SEM7820
  • Product Projection: 6-3/4"
  • Product Subgroup: Electromagnetic Door Holder / Releases
  • Product Type: Door Magnets
  • Product Voltage: 12V/24V/120V
  • Series: SEM 7800 Series
  • Subcategory: Fire and Life Safety Closers
  • Warranty: 2 Year

Professional Applications

  • Commercial Building Fire Safety Systems
  • Healthcare Facility Smoke Barrier Doors
  • Educational Institution Fire Door Control
  • Industrial Facility Emergency Egress
  • Multi-Tenant Residential Fire Compliance
  • Government and Municipal Building Safety
  • Retail Fire Protection Systems

Why Choose LCN Quality?

LCN SEM7820 door holding magnets deliver professional-grade reliability with die-cast housing construction and UL listing for fire door applications. Protected by a 2-year warranty with ANSI/BHMA A156.15 certification for demanding commercial fire safety applications. Engineered for dependable fail-safe operation where fire code compliance and reliable performance are essential.

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:
SEM7820
Product Voltage:
12V/24V/120V
Mounting Method:
Floor
Product Projection:
6-3/4"
Product Category:
Door Controls
Department:
Door Hardware

LCN SEM7820-689 – Frequently Asked Questions

1) Will the LCN SEM7820 door holder work if my fire alarm panel runs on 24VDC?
The SEM7820 is a tri-voltage holder, wired for 12V, 24V, or 120V, so it drops onto a 24V alarm circuit without a separate power supply or a different part number. You pick the voltage at install rather than ordering a voltage-specific model. Operation is fail-safe: when the alarm interrupts current, the magnet releases the door and it can be operated by hand until power comes back.
2) How far off the wall does the SEM7820 hold the door open?
Projection is 6-3/4 inches from the mounting surface to the face of the magnet. That number sets how far the door stands off the wall when held, so measure from your finished floor mounting point to where the armature plate lands on the door. If the door needs to sit further out than that, LCN offers armature extensions for the Sentronic 7800 Series.
3) Is the SEM7820 a floor-mounted or wall-mounted magnetic door holder?
Floor mounted. The SEM7820 sets on the floor and the armature mounts to the face of the door, which is the configuration to use when the wall behind the door is glass, is a partition that will not take the load, or is simply too far back to reach the door at the right height. A wall-mounted holder from the same Sentronic 7800 family is the alternative when you have solid backing at door height and do not want a unit standing on the finished floor.
4) Is 35 pounds of holding force enough for a heavy fire door on a corridor?
The SEM7820 delivers 35 pounds of holding force, which is the light-duty end of the electromagnetic holder range and suited to interior doors held open against a closer, not to exterior doors fighting wind load or stack pressure. It is rated for interior door use. If your opening sees real air pressure or the leaf is oversized, step up to a higher holding force magnet rather than adding a second unit.
5) Can I use the LCN SEM7820 on a labeled fire door or a smoke barrier?
Yes. The SEM7820 is UL listed for metal smoke barrier and labeled fire doors, and it meets ANSI/BHMA A156.15. That combination is what an inspector looks for on a hold-open at a smoke compartment: the door has to release and self-close when the detection system drops power, and this one does.
6) Does an electromagnetic door holder like the SEM7820 replace a door closer?
No, it works with one. The SEM7820 only holds the door open and lets go on alarm; something still has to close and latch the leaf, which is the closer's job. Plan on a closer on every opening where you put a hold-open magnet, otherwise the door releases and just stands there. On a fire or smoke barrier door that is the difference between compliance and a failed inspection.
7) Does the SEM7820 door magnet meet ADA and Buy American requirements for a government job?
Both are covered. The SEM7820 is ADA compliant and BAA qualified, which is what a federal, state, or municipal spec typically demands on top of the fire listing. For a public building package that also calls out ANSI/BHMA, the unit meets A156.15.
8) Do I need to buy mounting screws separately for the SEM7820 holder?
No. A wood and machine screw pack ships with the SEM7820, so the floor unit and the door armature both fasten with what is in the box. The one thing that is a separate order is an armature extension, which you only need when the door has to be held further from the magnet than the 6-3/4 inch projection allows.
9) Is the SEM7820 rated for exterior doors or wet locations?
Interior only. The SEM7820 is specified for interior doors in commercial buildings, so entry vestibules, exterior stair doors, and anything exposed to weather are outside what it is built for. Corridors, smoke compartment cross-doors, and interior lobby openings are where it belongs.
10) What finishes does the LCN SEM7820 come in?
Two: 689 aluminum and 695 dark bronze, both powder coat over a die-cast housing. If you are standardizing a building where the closers and push plates are already 689, the aluminum matches; 695 is the choice against dark frames and wood doors. There is no plated or brass option in this model.
How fast can I get the LCN SEM7820-689 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 SEM7820-689 come with a warranty?
Absolutely. The LCN SEM7820-689 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 SEM7820-689?
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 SEM7820-689 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.
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