--- product_id: 8938632 title: "Seco-Larm SM-226L-3Q Overhead Door Magnetic Contact, 2.75-inch Gap, Open/Closed Loop Circuits (3 Wires), 24\" Armored Wire Leads, Weatherproof" brand: "seco-larm" price: "¥7121" currency: JPY in_stock: true category: "Seco Larm" url: https://www.desertcart.jp/products/8938632-seco-larm-sm-226l-3q-overhead-door-magnetic-contact-2 store_origin: JP region: Japan --- # 24-inch armored stainless-steel wire leads Withstands heavy vehicle pressure Weatherproof die-cast aluminum housing Seco-Larm SM-226L-3Q Overhead Door Magnetic Contact, 2.75-inch Gap, Open/Closed Loop Circuits (3 Wires), 24" Armored Wire Leads, Weatherproof **Brand:** seco-larm **Price:** ¥7121 **Availability:** ✅ In Stock ## Summary > 🔒 Secure your space with the magnetic contact that means business. ## Quick Answers - **What is this?** Seco-Larm SM-226L-3Q Overhead Door Magnetic Contact, 2.75-inch Gap, Open/Closed Loop Circuits (3 Wires), 24" Armored Wire Leads, Weatherproof by seco-larm - **How much does it cost?** ¥7121 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/8938632-seco-larm-sm-226l-3q-overhead-door-magnetic-contact-2) ## 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 - • **Built to Brave the Elements:** Weatherproof die-cast aluminum casing ensures durability in any climate, keeping your security seamless rain or shine. - • **Rugged Yet Low-Profile Design:** Curved aluminum housing withstands heavy vehicle traffic without damage, blending strength with sleek minimalism for professional-grade installations. - • **Armored for Ultimate Protection:** 24-inch stainless-steel cable guards wiring against wear, crushing, and tampering—because your security deserves bulletproof wiring. - • **Generous 2.75-Inch Activation Gap:** Designed for large doors and gates, this magnetic contact fits where others fail—no more mounting headaches or seasonal adjustments. - • **Versatile Open/Closed Loop Compatibility:** NO/NC contact switch adapts effortlessly to any alarm system setup, giving you total control and peace of mind. ## Overview The Seco-Larm SM-226L-3Q is a weatherproof, heavy-duty overhead door magnetic contact switch designed for large doors and gates. Featuring a durable die-cast aluminum housing, a 2.75-inch activation gap, and 24-inch armored stainless-steel wire leads, it supports both normally open and normally closed circuits. Engineered to withstand heavy vehicle pressure and harsh weather, it offers reliable, long-lasting security with a contact lifetime of 50 million cycles, making it the go-to choice for professional-grade door security systems. ## Description The Seco-Larm Enforcer Overhead Door-Mount Magnetic Contact, NO/NC is a contact switch designed for large doors and gates where regular contacts may be difficult to mount. The contact’s large gap allows use with even the largest doors, such as garage doors. The switch is contained in low-profile cast aluminum housing, and curved so that heavy vehicles can cross over without damaging it.NO/NC contact switchUse on large doors or gatesMagnet in gray ABS case mounted on L-shaped bracket24-inch wire leads enclosed in stainless-steel cableRugged, Long-Lasting ConstructionSeco-Larm contacts have a unique rhodium plating which has gone through a special oxygen treatment to deactivate the surface, thus eliminating the absorption of organic impurities, polymer growth during operation, and the possibility of contact freezing.The switch is housed in weatherproof die-cast aluminum constructed for surface-mounting on a garage floor. It can withstand heavy vehicle pressure without damage. The switch is safely enclosed in an epoxy compound, and a 24-inch flexible stainless-steel cable gives complete protection to the switch wiring.The magnet is housed in a high-impact weatherproof ABS plastic case and can be mounted on a garage door with an "L"-shaped bracket, which minimizes the effect of steel doors on magnets.Technical DetailsMPN: SM-226L-3QUPC: 676544006473Alarm circuit: Three-wire N.O./N.C. Contact for either closed or open circuit alarm systemsReed switch: Gold under-plating with deactivated rhodium outer-platingSwitch housing: Weatherproof die-cast aluminumMagnet: Extra-strength Alnico 5Wire: 24 inches (61 cm), stainless-steel enclosureContact lifetime: 50 million cyclesRating: 0.02Amp./100VDC (max.), 0.2Amp./10VDC (max.), 3W (max.)Temperature: -15 to 160 °F (-25 to 70 °C)Dimensions: 4-3/8 x 1-3/4 x 7/16 inches (111 x 44 x 11 mm)Gap: 2-3/4 inches (70 mm)Listings: UL, RoHS ## Features - Magnet in gray ABS case mounted on L-shaped bracket - Use on large doors (garage) or gates - NO/NC contact switch - Withstands heavy vehicle pressure without damage ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B005H3GCW0 | | Best Sellers Rank | #288 in Home Security Systems | | Brand | Seco-Larm | | Brand Name | Seco-Larm | | Color | Gray | | Customer Reviews | 4.7 out of 5 stars 279 Reviews | | Finish Type | Unfinished | | Finish Types | Unfinished | | Item Depth | 9 inches | | Item Dimensions | 9 x 5.5 x 2 inches | | Item dimensions L x W x H | 9 x 5.5 x 2 inches | | Manufacturer | Seco-Larm | | Manufacturer Part Number | SM-226L-3Q | | Material | Aluminum | | Material Type | Aluminum | | Model Number | SM-226L-3Q | | Mounting Type | Door Mount | | UPC | 676544006473 | | Unit Count | 1 Count | ## Product Details - **Brand:** Seco-Larm - **Color:** Gray - **Finish Type:** Unfinished - **Item dimensions L x W x H:** 9 x 5.5 x 2 inches - **Material:** Aluminum ## Images ![Seco-Larm SM-226L-3Q Overhead Door Magnetic Contact, 2.75-inch Gap, Open/Closed Loop Circuits (3 Wires), 24" Armored Wire Leads, Weatherproof - Image 1](https://m.media-amazon.com/images/I/41d93LTq96L.jpg) ![Seco-Larm SM-226L-3Q Overhead Door Magnetic Contact, 2.75-inch Gap, Open/Closed Loop Circuits (3 Wires), 24" Armored Wire Leads, Weatherproof - Image 2](https://m.media-amazon.com/images/I/41+COdF219L.jpg) ## Frequently Bought Together - Seco-Larm SM-226L-3Q Overhead Door Magnetic Contact, 2.75-inch Gap, Open/Closed Loop Circuits (3 Wires), 24" Armored Wire Leads, Weatherproof - Seco-Larm SM-4601-L3Q Industrial Wide-Gap Magnetic Contact Switches, 3" Operation Gap NO/NC, Open/Closed Loop (3 Wires) - Seco-Larm SM-4201-LQ Track-Mount Overhead Door Magnetic Contact Switch, Rugged Aluminum Housing, 36" Wire Leads, for Closed Loop Circuits, 3" Gap, Weatherproof, Mounting Bracket Included --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/8938632-seco-larm-sm-226l-3q-overhead-door-magnetic-contact-2](https://www.desertcart.jp/products/8938632-seco-larm-sm-226l-3q-overhead-door-magnetic-contact-2) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-10-25*