LCN SEM7850 Sentronic Electrom...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$591.00
$374.71
LCN SEM7850 Sentronic Electromagnetic Door Holder with 35 Pound Holding Force and Tri-Voltage Design

LCN SEM7850 Sentronic Electromagnetic Door Holder with 35 Pound Holding Force and Tri-Voltage Design

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Model: SEM7850-695
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$591.00
$374.71
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LCN Sentronic 7850 Electromagnetic Door Holder with 35 Pound Holding Force and Tri-Voltage Design

Fire-Safe Door Control Solution for Commercial Applications

The LCN Sentronic 7850 is a standard profile recessed wall mount electromagnetic door holder engineered for commercial fire safety applications. This heavy-duty door holding magnet provides 35 pounds of holding force through tri-voltage design (12V/24V/120V) and automatically releases when fire alarm systems activate. The fail-safe operation ensures doors close properly during emergencies while maintaining convenient door positioning during normal operations, with UL listed certification for metal smoke barrier and labeled fire doors.

Professional Features & Benefits

  • Powerful Holding Force: Tri-voltage design delivers 35 pounds of holding force for reliable door positioning in high-traffic commercial environments.
  • Fire Safety Integration: Fail-safe operation automatically releases when fire alarm panel enters alarm condition, ensuring proper door closure during emergencies.
  • Heavy-Duty Construction: Die-cast housing provides exceptional durability for demanding commercial applications with long-term reliability.
  • Recessed Wall Mount Design: Standard profile recessed installation with 6-3/4" projection minimizes visual impact while providing secure mounting.
  • Tri-Voltage Flexibility: 12V/24V/120V operation accommodates various electrical system requirements for versatile installation options.
  • Professional Certifications: UL listed for metal smoke barrier and labeled fire doors with ANSI/BHMA A156.15 compliance for code requirements.
  • Manufacturer Warranty: Protected by 2-year warranty for added confidence and protection in commercial installations.
  • Pocket Door Compatible: Suitable for pocket door installations providing flexible application options for various architectural configurations.

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: Wall Mount
  • Product Category: Door Controls
  • Product Group: Door Controls
  • Product Model: SEM7850
  • 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 Emergency Egress
  • Educational Institution Safety Compliance
  • Industrial Facility Fire Protection
  • Multi-Tenant Residential Fire Systems
  • Government Building Emergency Systems
  • Retail Establishment Fire Safety

Why Choose LCN Quality?

LCN Sentronic electromagnetic door holders deliver professional-grade fire safety performance with die-cast construction and UL listed certification for demanding commercial applications. Protected by a 2-year warranty and tested to ANSI/BHMA A156.15 standards for reliable emergency response. Engineered for critical fire safety applications where dependable automatic release operation is essential for life safety compliance.

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
Department:
Door Hardware

LCN SEM7850-695 – Frequently Asked Questions

1) Will the LCN Sentronic 7850 door holder release automatically when the fire alarm goes off?
Yes, that is the whole point of the SEM7850. It's a fail-safe electromagnetic holder: power keeps the magnet energized and the door held open, and when the fire alarm panel goes into alarm the power drops and the magnet lets go so the closer can shut the door. Any loss of power, alarm or otherwise, releases the door. It's UL listed for use on metal smoke barrier and labeled fire doors and built to ANSI/BHMA A156.15.
2) What voltage do I need to run to the LCN SEM7850 electromagnetic door holder?
The SEM7850 is tri-voltage: 12V, 24V or 120V, so the same unit works off a low-voltage fire alarm circuit or straight off line voltage. You don't order a voltage-specific part or add a transformer to suit the panel; wire it to whichever of the three your fire alarm system supplies.
3) How far off the wall does the LCN Sentronic 7850 holder stick out, and how far does the door have to swing to catch it?
Projection is 6-3/4 inches. That is the dimension that decides where the holder lands on the wall: the door has to open far enough for its armature plate to meet the magnet face at that 6-3/4 inch standoff, so measure from the finished wall to the door face in the held-open position before you set the backbox. It's a wall mount unit with a standard profile recessed body.
4) Can I use the LCN Sentronic 7850 door holder on an exterior door?
No. The SEM7850 is specified for interior doors, and it's a commercial-duty unit. Its normal home is a corridor, smoke barrier, or cross-corridor opening inside the building, held open for traffic and dropped on alarm. For an exterior opening, look at a holder rated for exterior use instead.
5) Should I use an electromagnetic door holder or a closer/holder for a fire door that needs to stay open?
A wall mount magnet like the SEM7850 and a closer/holder do two different jobs. The magnet only holds the door; a separate door closer still has to be on the opening to actually close it when the magnet releases. That split is useful when the door already has a closer you want to keep, or when the hold-open point is far from the frame. A combination closer/holder unit puts both functions in one device at the header instead. Either way, on a labeled fire door the hold-open has to be tied to the fire alarm, which is what the fail-safe 7850 does.
6) Can the LCN SEM7850 be used on a federal or government project with Buy American requirements?
The Sentronic 7850 is BAA qualified, so it clears Buy American Act sourcing on federal and federally funded work. It's also ADA compliant, which matters on corridor and smoke barrier doors in institutional buildings where the held-open condition is what keeps the opening usable.
7) I'm standardizing hold-opens across a whole building. Can I put the same LCN 7850 on every corridor door?
For interior corridor and smoke barrier doors, yes, and that's the argument for it: one part number covers 12V, 24V and 120V circuits, so the panels and power supplies can differ floor to floor without changing what you stock. The two constraints to check opening by opening are the 6-3/4 inch projection (the wall has to be positioned so the door reaches the magnet at that standoff) and the 35 pound holding force being adequate for the heaviest doors in the set.
8) What else do I need to order with the LCN Sentronic 7850 to finish the installation?
Three things beyond the holder itself. A door closer on the opening, since the magnet holds but does not close. A wired connection back to the fire alarm panel on 12V, 24V or 120V so the hold-open drops in alarm. And the wall backbox prep for the recessed body at 6-3/4 inch projection, set so the door face meets the magnet at the hold-open angle you want. Installation templates for LCN closers and operators are published in the LCN templates and instructions index.
9) What finishes does the LCN Sentronic 7850 come in?
Two: 689 aluminum and 695 dark bronze, both powder coat. 689 is the standard match for aluminum storefront and most painted commercial trim; 695 goes with dark bronze frames and door hardware, which is the usual pick when the corridor hardware is already bronze. Since the holder mounts on the wall at door-swing height it is visible, so pick to match the frames rather than the wall.
How fast can I get the LCN SEM7850-695 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 SEM7850-695 come with a warranty?
Absolutely. The LCN SEM7850-695 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 SEM7850-695?
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
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