Door/window‑status sensor — AS31 is designed to detect whether a door or window is open or closed, acting as part of an access control or alarm system.

Operating distance: 16 mm ± 5 mm — The “magnet + sensor” pair triggers when they are aligned (door closed) or separated beyond that distance (door open).

Switch Output: Normally Closed (NC) — In normal (door‑closed) state, the circuit remains closed; when the door/window opens, it opens the circuit — common configuration for security wiring.

Electrical Ratings: 100 VDC withstand voltage, 500 mA load current — Suitable for interfacing with standard low‑power access control panels, alarms, and electric locks.

High Durability and Long Lifespan — Rated for ~1,000,000 cycles, which ensures long-term reliability under frequent door/open-close events.

Compact & Easy to Install — Small size and simple mounting make it practical for retrofit or new installations on doors or windows (especially non-steel doors).

Enhances Security & Automation — When integrated with a lock or alarm system, AS31 can automatically trigger door‑locked status check, raise alarms, or log unauthorized door opening. This helps in preventing intrusion or unauthorized access.

Low Maintenance & Reliable for Long Term Use — Because of its simple magnetic‑switch design, there are fewer electronic/ mechanical failures; the NC output ensures safe fail‑safe behavior (e.g. alarm if circuit opens unexpectedly).