SDC 1591U EMLock Electromagnetic Lock, Mortise Mount, 850lbs

The SDC 1591U is a 1590 Series mortise-mounted electromagnetic lock designed to secure manual and automatic sliding doors with 850 lbs of holding force. Featuring a compact stainless steel housing with a 630 satin stainless steel finish, the lock operates on field-selectable 12/24 VDC power and releases immediately when power is removed. Its concealed mortise installation, voltage spike protection, and fail-safe operation make it suitable for commercial access control systems, high-traffic entrances, and industrial sliding door applications.

SDC 1591U 1590 Series Electromagnetic Sliding Door Lock, 850 lb Holding Force

The SDC 1591U EMLock is a compact, heavy-duty electromagnetic locking device engineered for securing manual and automatic sliding doors in commercial, institutional, and industrial environments. Part of Security Door Controls' 1590 Series, this mortise-mounted magnetic lock delivers 850 lbs of holding force while maintaining a concealed installation within the door frame. The lock consists of two primary components: an electromagnetic locking assembly installed in the frame and an armature plate mounted in the door. When energized, the electromagnet attracts and retains the armature, securing the door in its closed position. When electrical power is interrupted, the magnetic field collapses and the door releases immediately, providing fail-safe unlocking for compatible access and egress control applications.

The 1591U features a stainless steel mortise housing with a 630 satin stainless steel finish, providing a durable enclosure for frequent door operation. The electromagnetic locking assembly measures 10 inches long x 1-7/16 inches wide x 1-1/4 inches deep, allowing installation within appropriately prepared door frames. The lock supports field-selectable 12 VDC or 24 VDC operation, drawing approximately 700 mA at 12 VDC or 350 mA at 24 VDC. Integrated inductive kickback protection helps suppress voltage transients associated with electromagnetic operation, while the supplied power leads simplify connection to compatible access control power supplies. The 1590 Series is identified by SDC as meeting ANSI/BHMA A156.23 Grade 1 requirements and carries manufacturer-listed certifications including UL 1034, UL 10B, UL 10C, ULC-S104, and ULC-S533.

Designed primarily for single and paired sliding door applications, the SDC 1591U accommodates manual and automatic door systems where reliable electromagnetic locking is required. A single lock can secure one sliding door or a pair of sliding doors when the door arrangement prevents travel beyond the center position. For industrial sliding doors requiring increased holding capacity, two 1590 Series electromagnetic locks can provide a combined nominal holding force of up to 1,700 lbs when properly installed. The series also supports suitable swinging door configurations, subject to mounting geometry and application requirements. Its compact mortise design preserves the appearance of architectural entrances while positioning the locking mechanism within the frame rather than using a conventional exposed surface-mounted magnetic lock.

The SDC 1591U is designed for installation with the electromagnetic assembly recessed into the door jamb and the armature aligned with the magnet core on the leading edge of the door. Manufacturer installation instructions specify an armature cutout measuring 1-1/2 inches wide x 6-1/2 inches long, with reinforcement requirements determined by door construction. Compatible installation accessories include the SDC AMP armature mounting plate for wood doors and the SDC LAB angle bracket for alternative armature mounting arrangements. Door position monitoring is available through the separately configured 1591UDPS model. The lock integrates with appropriately rated power supplies, access control relays, and egress release devices, with wiring and installation subject to applicable life-safety and building codes. Backed by a 5-year manufacturer warranty, the 1591U provides a mortise-mounted electromagnetic locking solution for access-controlled sliding door systems.