The **M2RS-35-R/UL** is a high-performance **Magnetic Proximity Sensor** (often categorized as a Reed Switch or Magnetic Actuator) manufactured by **Magnasphere**. These parts are primarily used in high-security environments where traditional reed switches are vulnerable to external magnetic interference or tampering. --- ### 1. Technical Specifications The "M2RS" series is designed to meet UL (Underwriters Laboratories) standards for safety and security. | Feature | Specification | |:---|:---| | **Contact Type** | Normally Closed (NC) / Form A | | **Max Voltage** | 30 VDC | | **Max Current** | 0.250 A | | **Housing Material** | Aluminum or high-grade plastic (model dependent) | | **Mounting** | Surface Mount / Recessed | | **Operation Gap** | Typically 0.35" to 0.5" (nominal) | | **Certifications** | UL 634 Level 2 High Security | --- ### 2. Key Electronic Components & Technology #### A. Magnasphere Technology Unlike a standard glass-bulb reed switch (which uses two thin metal reeds), the M2RS uses a **patented spherical magnet technology**. * **Mechanism:** Inside the sensor is a small, magnetically sensitive ball. * **Tamper Resistance:** Traditional reed switches can be "defeated" by placing a strong magnet outside the door. The Magnasphere ball is designed to move to a "tamper" state if an external magnet is introduced, triggering an alarm. #### B. The Actuator (The "R" in the part number) The sensor assembly consists of two distinct electronic parts: 1. **The Switch (Sensor):** Wired into the security panel or PLC. 2. **The Actuator (Magnet):** Mounted on the moving part (door/window). When the magnet is within the "Operation Gap," the internal circuit is held in its secure state. --- ### 3. Wiring and Integration The device is typically integrated into low-voltage DC circuits. ```yaml Wiring Layout: - Wire 1 (Black): Common / Ground - Wire 2 (Black): Signal (Closed Loop) - Resistance: Very low contact resistance (< 0.2 Ohms) ``` ### 4. Typical Applications * **SCIF Rooms:** Sensitive Compartmented Information Facilities. * **Bank Vaults:** High-security access points. * **Industrial Automation:** Position sensing where magnetic interference is present. ---