About this item
The Sargent 3287 is a concealed door position status switch that tells your access control system, alarm panel, or building automation controller whether a specific door is open or closed, in real time, without any visible hardware on the door face. If you're specifying a door that needs to report its position to a Sargent Electroguard system, an access control panel, an alarm system, or a delayed egress device, the 3287 is the part that provides that signal.
How It Works
The 3287 is a magnetic reed switch system. Two components install concealed in the door and frame: a magnet and a switch body. When the door is closed, the magnet is in proximity to the switch and the circuit closes. When the door opens, the magnet moves away from the switch, the circuit opens, and your connected system receives the signal that the door is no longer in the closed position. No mechanical contact between door and frame, no visible hardware, no surface-mounted box on the frame.
This is an SPDT (single pole double throw) concealed switch on 3 leads. The three wire colors identify the connection function: white is common, red is normally open, green is normally closed. Wire colors are assigned relative to the door closed position, meaning when the door is shut and the magnet is in proximity to the switch, the normally closed circuit is active. Open the door, the normally closed circuit breaks and the normally open circuit closes.
Electrical Specifications
Contact rating is 1/4 amp at 24VDC. Leads are 12" #22 AWG wire. The switch body and magnet both fit into a 1" diameter hole drilled 1" deep, with a 1/4" hole for the wires if concealed routing is required. A shim is supplied with the switch for installation in a metal frame, which affects the spacing between the magnet and switch when the door is closed.
What "Concealed" Means in Practice
The magnet and switch body both sit recessed inside the door edge and frame edge. When the door is closed, nothing is visible on either the door face or the frame face. This matters on architectural applications where surface-mounted contact switches would look wrong or be at risk of damage. It also matters on alarm applications where a visible sensor could be defeated or tampered with more easily than a concealed one.
Electroguard Compatibility
The 3287 integrates directly with Sargent Electroguard systems. In a Sargent delayed egress exit device installation, the 3287 is the door status switch that signals the rail when the door is forced open. If the door is violated while the system is armed, the 3287 status switch triggers the device, sounding the alarm. During a fire alarm condition, the switch's open state helps signal the system to allow immediate egress by de-energizing the electromagnetic components. The 3287 is referenced across multiple Sargent 57-Series, 80-Series, and BPS Series exit device installation documents as the specified door position sensor for those systems.
The Companion Surface Mount Option
The concealed 3287 is paired in the Sargent line with the 3285, which is the surface-mounted door status switch covering the same monitoring function. The 3285 mounts visibly on the frame face. The 3287 is specified when the installation requires the sensor to be completely hidden. Both carry the same 1/4 amp at 24VDC rating. If you need surface mount, order the 3285. If you need concealed, the 3287 is your part.
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