--- product_id: 71821218 title: "Seco-Larm DH-171SQ Flush-Mount Magnetic Door Holder; Holding force 33-lb (15kg); Hard Wired Electric Operation" brand: "seco-larm" price: "Β₯21036" currency: JPY in_stock: true category: "Seco Larm" url: https://www.desertcart.jp/products/71821218-seco-larm-dh-171sq-flush-mount-magnetic-door-holder-holding store_origin: JP region: Japan --- # Tri-volt electric operation 33-lb magnetic hold Flush-mount sleek design Seco-Larm DH-171SQ Flush-Mount Magnetic Door Holder; Holding force 33-lb (15kg); Hard Wired Electric Operation **Brand:** seco-larm **Price:** Β₯21036 **Availability:** βœ… In Stock ## Summary > 🧲 Hold the moment, release the future. ## Quick Answers - **What is this?** Seco-Larm DH-171SQ Flush-Mount Magnetic Door Holder; Holding force 33-lb (15kg); Hard Wired Electric Operation by seco-larm - **How much does it cost?** Β₯21036 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/71821218-seco-larm-dh-171sq-flush-mount-magnetic-door-holder-holding) ## Best For - seco-larm enthusiasts ## Why This Product - Trusted seco-larm brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Flush-Mount Elegance:** Discreet, low-profile aluminum faceplate blends effortlessly into modern interiors. - β€’ **Tri-Voltage Compatibility:** Seamlessly integrates with 12/24 VAC/VDC and 120VAC systems for versatile installation. - β€’ **UL-Listed Integration Ready:** Optimized for Seco-Larm door closers with easy armature adjustments for perfect alignment. - β€’ **Powerful 33-lb Holding Force:** Securely holds doors open with industry-leading electromagnetic strength. - β€’ **Fail-Safe, No Residual Magnetism:** Ensures smooth, reliable door release every timeβ€”no sticking, no hassle. ## Overview The Seco-Larm DH-171SQ Flush-Mount Magnetic Door Holder delivers a robust 33-pound electromagnetic hold with tri-voltage support (12/24 VAC/VDC, 120VAC) in a sleek, flush-mount aluminum design. Engineered for fail-safe operation with no residual magnetism, it pairs perfectly with UL-listed Seco-Larm door closers to provide seamless remote door control in commercial and residential settings. Backed by a 2-year warranty and easy installation hardware, it’s the smart choice for professionals demanding reliability and style. ## Description Designed for use with a UL-listed Seco-Larm door closer (sold separately), the Seco-Larm Magnetic Door Holder allows you to remotely control the release and closing of the door. Keep your door open all day with the door holder making sure it stays open, then when you're ready to close up, activate the door closer and the door holder will automatically release at the same time.The unit consists of two main components: 1) the electrified magnetic door holder that mounts to the wall behind your door, and 2) the armature plate that mounts onto the inside of your door in alignment with the magnet. When the door is opened all the way, the metal plate on the door is attracted to the electrified magnet on the wall, holding the door open.Used with Seco-Larm door closers to control door release and closingProvides 33 pounds of electromagnetic holding force (15kg)No residual magnetism allows easy release; fail-safe operationLow profile design with cast aluminum faceplate3 voltages: 12/24 VAC/VDC, and 120VACBuilt-in voltage spike suppressorTwo models are available. Choose between a magnetic door holder that surface-mounts onto the wall or one that flush-mounts into the wall. Both models come with all the mounting hardware you need. The armature plate is adjustable to make installation easy on any door and also adjusts to accommodate post-installation alignment changes. The unit features tri-volt coils (12/24 VAC/VDC, and 120VAC) and a built-in spike suppressor.The unit works with any Ul-listed Seco-Larm door closers. It also optionally works with Seco-Larm extension bars: 1/2", 3/4", 1", 2", 3", 4", 5", 6", 7" (13mm, 19mm, 25mm, 50mm, 76mm, 102mm, 127mm, 152mm, 178mm).ContentsMagnetic Door HolderArmature PlateBack Box (DH-151SQ Surface-Mount model only)(2) #10x11/4" Wood Screws(4) 4x8 Machine Screws(2) 3x10 Machine Screws(2) 5x15 Machine Screws(2) JumpersInstruction ManualNOTE: Requires a Seco-Larm door closer, sold separately.Technical DetailsManufacturer Part #: DH-171SQUPC: 676544017493Type: Flush-MountOperating Voltage: 12/24 VAC/VDC, 120VACCurrent Draw:52mA at 12VAC, 60mA at 12VDC27mA at 24VAC, 31m at 24VDC24mA at 120VACHolding Force: 33 pounds (15kg)Magnet Dimensions: 2-3/4 x 4-9/16 x 2-1/16 inches (70 x 116.5 x 52 mm)Armature Dimensions: 2-9/16 x 2-9/16 x 1-9/16 inches (65 x 65 x 40 mm)Magnet Box Weight: 1 pound 1.5 ounces (496g)Door Armature Weight: 8.1 ounces (230g)Approvals: UL, CE, RoHSWarranty: 2 Years ## Features - Used with Seco-Larm door closers to control door release and closing - Provides 33 pounds of electromagnetic holding force (15kg) - No residual magnetism allows easy release; fail-safe operation - 3 voltages: 12/24 VAC/VDC, and 120VAC - Installation Type: Flush-Mount ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01M5EHW8U | | Best Sellers Rank | #78,786 in Office Products ( See Top 100 in Office Products ) #518 in Door Stops | | Brand Name | Seco-Larm | | Color | Multicolor | | Customer Reviews | 4.6 4.6 out of 5 stars (83) | | Exterior Finish | Aluminum | | Included Components | 1x Door holder, 1x Armature, 2x Jumpers (1x pre-installed), 2x M5x15 Machine screws, 2x #10x1 1 /4" Wood screws, 4x M4x8 Machine screws, 2x M3x10 Machine screws, 1x Back box, 1x 1" Extension bar, 1x Extension bar wrench | | Installation Type | Flush-mount | | Item Dimensions L x W x H | 2.76"L x 2.88"W x 2.76"H | | Item Weight | 496 g | | Manufacturer | Seco-Larm | | Manufacturer Part Number | DH-171SQ | | Manufacturer Warranty Description | 2 Years | | Material Type | Aluminum | | Model Number | DH-171SQ | | Number of Items | 1 | | Number of Packs | 1 | | Recommended Uses For Product | For use with door closers to control the release and closing of residential, commercial, and public area doors | | Size | Pack of 1 | | Specification Met | UL | | UPC | 676544017493 | | Unit Count | 1 Count | ## Product Details - **Brand:** Seco-Larm - **Color:** Multicolor - **Exterior Finish:** Aluminum - **Material:** Aluminum - **Product Dimensions:** 2.76"L x 2.88"W x 2.76"H ## Images ![Seco-Larm DH-171SQ Flush-Mount Magnetic Door Holder; Holding force 33-lb (15kg); Hard Wired Electric Operation - Image 1](https://m.media-amazon.com/images/I/71j++LYNCxL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Do you sell replacement key fobs for the secolarm dh171sq?** A: There are no β€œkeyfobs” with or for this product. **Q: Do you have to have power run to operate this door stop?** A: Yes **Q: it can be used without power ?** A: No **Q: Will these mount to a single gang electrical box?** A: Yes. It will fit to single-gang box. ## Frequently Bought Together - Seco-Larm DH-171SQ Flush-Mount Magnetic Door Holder; Holding Force 33-lb (15kg); for Use with Door Closers to Control The Release and Closing of Residential, Commercial and Public Area Doors - Kidde SM120X Interconnect Accessories Smoke Relay Module - Seco-Larm DH-151SQ Magnetic Door Holder, Surface-Mount, Adjustable Armature Plate, 33-lb Holding Force, Cast Aluminum Faceplate, Built-in Voltage Spike Suppressor, Low Profile Design --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/71821218-seco-larm-dh-171sq-flush-mount-magnetic-door-holder-holding](https://www.desertcart.jp/products/71821218-seco-larm-dh-171sq-flush-mount-magnetic-door-holder-holding) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-09-29*