Nascom N505A/STHSMPAG Recessed Contact 3ft Ac

Product Description

The NASCOM N505A/STHSMPAG is a pull-apart recessed contact designed for door and window security sensing applications. This unit features a housescale receiver configuration with a 3-foot AC connection lead and an integrated break circuit. Recessed contacts are embedded into the door frame or window sash, keeping hardware concealed from view while maintaining a reliable open/close detection circuit. The pull-apart design allows for clean separation between the door leaf and the frame section, simplifying field wiring and maintenance access. Security and low-voltage alarm technicians are the primary installers of this type of device.

This recessed contact is suited for residential and light commercial security alarm installations where a low-profile, concealed sensing point is required. Typical applications include hinged doors, sliding doors, and window frames where surface-mount contacts are not desired. The 3-foot AC lead provides adequate wire length for routing within a door frame or wall cavity to the nearest junction point. The break circuit configuration is standard for alarm loop wiring in supervised security systems.

Key Features

• Pull-apart design separates door and frame sections for clean installation and serviceability
• Recessed mounting keeps contact hardware concealed within the door frame or sash
• 3-foot AC connection lead included for in-frame wire routing
• Integrated break circuit compatible with standard supervised alarm loops
• Housescale receiver format for consistent fitment in standard recessed bore applications

Compatibility

Designed as an OEM-style recessed contact for use in residential and light commercial door and window alarm sensing applications.

Installation Notes

Installation is typically performed by a licensed low-voltage or alarm systems technician. Drill the recessed bore to the manufacturer-specified diameter and depth before seating the contact body. Ensure the alarm panel or control loop is fully powered down before making wiring connections. Route the lead wire carefully within the door frame cavity to avoid pinching or abrasion at hinge points.