NC Magnetic Reed Switch Door Sensor for Security Alarm Systems
NC Magnetic Reed Switch Door Sensor for Security Alarm Systems
NC Magnetic Contact Reed Switch — Discreet, Durable Door & Window Security
Upgrade your security alarm system with this Normally Closed (NC) Magnetic Contact Reed Switch. Crafted from solid zinc alloy, this concealed sensor is engineered for seamless installation into wooden doors, windows, fire-rated doors, and roller shutter doors. When the magnet is close, the circuit stays closed — when the door opens and the magnet moves away, the circuit breaks and triggers your alarm. Simple, reliable, and built to last. Made in China.
Key Features
- Normally Closed (NC) Output: Circuit closes when magnet is near; opens (triggers alarm) when magnet moves away — ideal for intrusion detection.
- Concealed / Embedded Design: Installs flush inside door or window frames for a clean, tamper-resistant finish.
- Wide Compatibility: Works with wooden doors, windows, fire-proof doors, and metal roller shutter doors.
- Durable Zinc Alloy Body: Resistant to wear, corrosion, and everyday mechanical stress.
- Long Service Life: Rated for up to 1,000,000 switching cycles for dependable, long-term performance.
- Sensitive Activation Range: Action distance of 25 mm – 30 mm for accurate, reliable triggering.
- CE Certified: Meets European conformity standards for safety and performance.
- Wired Connection: Simple, stable wired integration with virtually any security alarm panel or control board.
Technical Specifications
| Product Type | Embedded Magnetic Reed Switch (NC) |
| Material | Zinc Alloy |
| Switch Output | Normally Closed (NC) |
| Action Distance | 25 mm – 30 mm |
| Switching Voltage | 100 V DC |
| Load Current | 500 mA |
| Rated Power | 10 W |
| Service Life | 1,000,000 cycles |
| Model Numbers | RC-51 / RC-52 / RC-55 / RC-56 / RC-60 |
| Certification | CE |
| Country of Origin | Made in China |
Ideal Applications
- Home and commercial security alarm systems
- Roller shutter and garage door monitoring
- Wooden and fire-rated door/window sensors
- Access control integration
- DIY smart home security setups
Learn More About Home Security
For guidance on best practices in home security and alarm systems, visit the U.S. Consumer Product Safety Commission (CPSC) Home Safety Resource.
Learn more: Window security
Frequently Asked Questions
Q: What does "Normally Closed (NC)" mean for this magnetic reed switch door sensor?
A: A Normally Closed (NC) reed switch keeps the electrical circuit closed (connected) when the magnet is within the 25–30 mm action distance — i.e., when the door or window is shut. When the door opens and the magnet moves away, the circuit opens (breaks), sending a signal to your alarm panel to trigger an alert. This is the most common configuration used in security alarm systems.
Q: Is this magnetic contact sensor compatible with my existing alarm panel?
A: Yes — this wired NC magnetic reed switch is universally compatible with virtually all standard wired security alarm panels and control boards that accept normally closed zone inputs. Simply connect the two wires from the sensor to your alarm panel's NC zone terminals.
Q: Can this door sensor be used on metal roller shutter doors?
A: Absolutely. This sensor is specifically designed for use on roller shutter doors, as well as wooden doors, windows, and fire-rated doors. The zinc alloy housing provides the durability needed for metal door environments.
Q: How difficult is installation?
A: Installation is straightforward. The sensor is designed to be embedded (concealed) into a drilled recess in your door frame, and the accompanying magnet is embedded into the door itself. Route the wires to your alarm panel, connect to the NC zone, and you're done. No special tools are required beyond a drill and appropriate drill bit.