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LCN SEM7810 - SEM Series Extension, Aluminum Painted Finish
SEM Series Fire/Life Safety Closers/Holders
All SEM series magnets are UL listed for smoke barrier or labeled fire doors.
Tested and certified under ANSI Standard A156.15. heavy duty, electrically controlled door holding magnets. Magnets are fail safe and hold until the current is interrupted. A manual door closer is used to control and close the door.
Manufacturer Resources
LCN Full Line Catalog
Product Specs
- Series:
- SEM Series
- Subcategory:
- Parts and Accessories
- Product Group:
- Door Controls
- Product Subgroup:
- Parts and Accessories
- Product Type:
- Extension
- Commercial/Residential:
- Commercial
- Parts and Accessories Type:
- Installation Accessories
- Product Attribute:
- Parts and Accessories
- Product Category:
- Door Controls
- Department:
- Door Hardware
LCN SEM7810-E200 689 – Frequently Asked Questions
1) What is the LCN SEM7810 extension used for?
The SEM7810 is an extension bracket for LCN SEM series electromagnetic door holders. It spaces the magnet or armature out from its mounting surface so the two meet squarely when the wall, frame return, or door face sits back farther than a flush mount allows. It is an installation accessory, not a holder on its own, so you still need the SEM magnet and a manual door closer to control and close the door.
2) Which size LCN SEM7810 extension do I need, the 2 inch or the 4 inch?
The SEM7810 comes in 2 inch and 4 inch lengths. Measure the gap between the magnet mounting surface and where the armature plate lands when the door is in the held-open position, then pick the extension that closes that gap. If the standoff needed is around two inches, take the 2 inch; deeper recesses, thicker trim, or a wall return that sets the magnet well back call for the 4 inch. Ordering the wrong length leaves the magnet and armature out of contact, and the door will not hold.
3) Can I use the SEM7810 extension on a labeled fire door or smoke barrier opening?
Yes. All LCN SEM series magnets are UL listed for smoke barrier or labeled fire doors, and the series is tested and certified under ANSI Standard A156.15. The SEM7810 extension is part of that series hardware, so it is intended for those fire and life safety hold-open installations rather than general decorative use.
4) Will the SEM hold-open magnet release if the building loses power?
Yes. SEM series magnets are fail safe: they hold the door open only while current is applied and release the moment the current is interrupted, whether that is a fire alarm signal or a power loss. The attached closer then swings the door shut. The SEM7810 extension does not change that behavior, it only sets the magnet's standoff.
5) Does the SEM7810 extension include the closer or the magnet?
No. The SEM7810 is the extension only. A complete hold-open installation needs the SEM electromagnetic holder with its armature plus a manual door closer, which is what actually controls and closes the door once the magnet releases. Budget and order those separately.
6) Is the LCN SEM7810 rated for commercial use, and what finish does it come in?
It is a commercial-grade part, supplied in an aluminum painted finish. That finish matches the standard aluminum painted SEM magnets and armatures, so an extension added later will not stand out against holders already installed on other openings in the building.
How fast can I get the LCN SEM7810-E200 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 SEM7810-E200 689 come with a warranty?
Absolutely. The LCN SEM7810-E200 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 SEM7810-E200 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 SEM7810-E200 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.