Securitron UNL-24 UnLatch Strike, 24VDC, Satin Stainless Steel

The Securitron UNL-24 UnLatch is a 24VDC motorized electric strike for cylindrical and tubular locksets, designed for commercial electronic access control applications. Featuring 1,500 lbs of static holding force, ANSI/BHMA A156.31 Grade 1 performance, and integrated SPDT latch status monitoring, it provides electrically controlled entry while maintaining the lock's deadlatch function. The continuous-duty strike draws 1.5A during startup and 200mA during operation, accommodates latchbolts up to 5/8 inch, and fits standard 4-7/8-inch ANSI strike preparations. The standard configuration is fail secure and carries a UL 10C three-hour fire listing for approved single-door assemblies.

Securitron UNL-24 UnLatch 24VDC Grade 1 Motorized Electric Strike

The Securitron UNL-24 UnLatch Motorized Electric Strike is a heavy-duty electronic locking solution engineered for commercial doors equipped with compatible cylindrical or tubular latchsets. Manufactured by Securitron, an ASSA ABLOY brand, the UNL-24 uses a motor-driven release mechanism rather than a conventional pivoting electric strike keeper, allowing it to operate the latchbolt while maintaining the deadlatching function of compatible locksets. The strike provides 1,500 pounds (680 kg) of static holding force and meets ANSI/BHMA A156.31 Grade 1 performance requirements. Its concealed, frame-mounted installation supports commercial offices, educational facilities, institutional properties, controlled entrances, and other locations requiring electronically managed access without replacing the existing compatible mechanical lockset.

The UNL-24 operates from a 24VDC power source with a manufacturer-specified tolerance of +20%/-10%. Its motorized actuator requires approximately 1.5 amps of momentary startup current and 200mA during powered operation, while the installation instructions identify a separate 40mA idle current. The continuous-duty design accommodates both short-duration door releases and extended electrically unlocked periods when controlled by compatible access control equipment. Unlike solenoid-driven strikes, the UnLatch mechanically operates the latchbolt using an internal motorized mechanism designed to release under preload conditions. Its standard fail-secure configuration remains locked when electrical power is removed, while the separately ordered FSUNL-24 interface module provides field-selectable fail-safe or fail-secure operation for approved applications.

Designed for electronic access control integration with cylindrical door locks, the Securitron UNL-24 can be connected to compatible card readers, keypads, access control relays, and remote door release switches. The device accommodates cylindrical springlatches and deadlatches with 1/2-inch to 5/8-inch latchbolt projection, subject to the manufacturer's specified alignment and door gap requirements. Its integrated SPDT latch status monitoring switch provides an electrical indication of the latched or unlatched condition for connection to compatible security monitoring equipment. During authorized entry, the access control system initiates the strike's motorized release sequence, allowing the door to open without requiring mechanical operation of the exterior lock trim. The UNL-24 is intended for cylindrical and tubular latchsets and is not compatible with mortise locks, rim latches, or most panic exit device latches.

The Securitron UNL-24 features a satin stainless steel faceplate and compact concealed strike body designed for installation in compatible aluminum, hollow metal, and wood door frames. Its faceplate measures approximately 4-7/8 inches high by 1-1/4 inches wide, while the strike body requires approximately 1-1/2 inches of mounting depth. A properly prepared ANSI 4-7/8-inch commercial strike opening may accommodate the unit with minimal modification, although installations with smaller strike preparations or obstructed frame cavities require additional preparation. Manufacturer documentation specifies an operating temperature range of -20 F to 125 F (-29 C to 52 C) and identifies UL 10C three-hour fire door listing, CAN/ULC fire door approval, and ANSI/BHMA A156.31 Grade 1 certification for approved applications. The UNL-24 provides a high-strength motorized electric strike solution for compatible commercial cylindrical locking systems requiring concealed installation, supervised latch status, and electronically controlled access.