The **M2PP-91N-R2/UL** is a specific electronic component, typically categorized as a **Magnetic Proximity Sensor** or a **Reed Switch Assembly**, often used in industrial automation, security systems, and position sensing. Below is a detailed breakdown of its electronic characteristics and specifications. ### 1. Technical Specifications The device operates based on magnetic field interaction. When a permanent magnet comes within a specific range, the internal reed switch closes (or opens) to complete a circuit. | Parameter | Description | | :--- | :--- | | **Contact Form** | Form A (Normally Open / SPST) | | **Switching Voltage** | Usually up to 100V DC / 125V AC | | **Switching Current** | 0.5A (Typical) | | **Contact Rating** | 10W / 10VA | | **Housing Material** | Plastic (UL Recognized) | | **Termination** | Wire Leads (R2 typically denotes lead length or style) | --- ### 2. Key Electronic Components The internal construction of the M2PP-91N-R2/UL consists of three primary elements: 1. **Reed Switch:** Two ferromagnetic blades hermetically sealed in a glass envelope. In the presence of a magnetic field, the blades become polarized and pull together. 2. **Protective Resistor (Optional):** Some variants include a built-in resistor to prevent inrush current from damaging the contacts. 3. **Potting Compound:** An epoxy resin that fills the housing to protect the electronics from moisture, vibration, and dust (IP-rated). --- ### 3. Standards and Compliance The suffix in the part number provides critical information regarding its electronic safety standards: * **UL (Underwriters Laboratories):** The "/UL" suffix indicates that the part has been tested and recognized for safety in the US and Canada. This is crucial for components used in control panels or appliances that require fire and shock hazard certification. * **RoHS Compliant:** Modern iterations of this part are lead-free and compliant with environmental regulations. --- ### 4. Typical Applications Because it is a non-contact electronic switch, it is used where mechanical switches would wear out: * **Door/Gate Sensing:** Detecting if a panel is open or closed. * **Pneumatic Cylinder Position:** Sensing the end-of-stroke for a piston. * **Limit Switching:** Acting as a boundary sensor in robotics.