The **M2RS-0B-R2/UL** is a high-performance **Magnetic Proximity Sensor** (often referred to as a Reed Switch or Actuator) typically used in security systems, industrial automation, and door/window monitoring. Below is a breakdown of its technical specifications and electronic characteristics. --- ### 1. Technical Specifications The device is designed to act as a non-contact switch that completes or breaks a circuit when a magnetic field is detected. | Feature | Specification | | :--- | :--- | | **Contact Type** | Normally Open (NO) / SPST | | **Max Switching Voltage** | 100V DC / 125V AC | | **Max Switching Current** | 0.5A | | **Contact Rating** | 10W / 10VA | | **Housing Material** | ABS Plastic (Fire Retardant) | | **Sensing Distance** | ~15mm to 25mm (Gap dependent) | | **Safety Certification** | UL Listed | --- ### 2. Key Electronic Components The functionality of the M2RS-0B-R2/UL relies on a few core internal parts: #### A. The Reed Switch (Internal) The heart of the unit is a hermetically sealed glass envelope containing two ferromagnetic blades. * **Material:** Usually coated with Rhodium or Ruthenium to prevent "sticking" and ensure long life cycles. * **Operation:** When the companion magnet comes within range, the magnetic flux pulls the blades together, closing the circuit. #### B. The Magnetic Actuator This is the separate half of the pair. * **Type:** Typically a Permanent Neodymium or Alnico magnet. * **Polarity:** Aligned specifically to interact with the internal reed switch at a defined distance (the "Gap"). #### C. Terminal/Wire Interface The "R2" designation often refers to the wiring configuration (usually 2-wire). * **Lead Wires:** Standard 22 AWG or 24 AWG wires, often UL1007 rated. --- ### 3. Circuit Application In an electronic circuit, the M2RS-0B-R2/UL acts as a dry contact. ```python # Conceptual logic for a microcontroller (e.g., Arduino) # PIN_REED connected to the sensor if digitalRead(PIN_REED) == HIGH: print("Door Closed / Magnet Present") else: print("Door Open / Alarm Triggered") ``` --- ### 4. Safety and Ratings * **UL Listing:** The "/UL" suffix indicates it has passed Underwriters Laboratories safety standards for fire and electrical shock prevention in commercial/residential use. * **Environmental Protection:** These parts are typically sealed to protect against dust and moisture (IP67 or similar), making them reliable for long-term installation.