Seco-Larm SM-4104-TQ/W 3/4-inch Steel Door Recessed Closed Loop Alarm Sensor

The Seco-Larm SM-4104-TQ/W is a 3/4-inch steel door recessed closed-loop magnetic contact designed for professional life-safety and commercial security installations. Recessed mounting keeps the contact concealed within the door frame, preserving door aesthetics and reducing exposure to physical tampering. The closed-loop circuit configuration provides a fail-safe supervisory signal, alerting the control panel immediately upon any interruption of the circuit. Built for demanding commercial environments, this contact integrates smoothly into intrusion detection systems where reliable door-status monitoring is essential.

Key features & benefits

• Recessed Installation — Designed to mount flush within the door and frame, concealing the contact from view and protecting it from environmental exposure and tampering attempts.
• Closed-Loop Circuit Design — Operates on a normally-closed loop configuration, providing continuous supervisory monitoring and immediate alarm notification upon circuit interruption.
• Steel Door Compatibility — Engineered specifically for 3/4-inch steel door applications, making it well-suited for commercial and industrial entry points where robust door construction is standard.
• Professional-Grade Construction — Manufactured by Seco-Larm, a recognized name in commercial security components, supporting reliable long-term performance in life-safety installations.