The **10JR-3A-R** is a specific model of a **magnetic proximity sensor** or **reed switch**, typically manufactured by companies like **Aleph** or used in industrial security and automation systems. Below is a detailed breakdown of its electronic components, specifications, and functions. --- ### 1. Technical Specifications This part is designed as a non-contact switch that reacts to the presence of a magnetic field. | Property | Description | | :--- | :--- | | **Component Type** | Magnetic Reed Switch / Proximity Sensor | | **Contact Form** | Form A (Normally Open - NO) | | **Switching Voltage** | Usually up to 100V DC (max) | | **Switching Current** | 0.5A (Typical range) | | **Contact Capacity** | 10VA (Volt-Amperes) | | **Housing Material** | High-grade Plastic or Resin (Rh-plated contacts) | | **Connection Type** | Wired (Lead wires) | --- ### 2. Internal Parts and Construction The "electronic" nature of this part is passive, meaning it does not require power to operate, but rather responds to external physical forces (magnetism). * **The Reed Switch:** Inside the plastic housing are two ferromagnetic blades (reeds) sealed in a glass envelope. * **Contact Plating:** The tips of the reeds are often plated with **Rhodium (Rh)** or **Ruthenium**. This provides high durability against electrical arcing and ensures a long lifecycle (millions of operations). * **The Housing:** The "10JR" series usually features a threaded or flange-mount cylindrical body, protecting the fragile glass reed from mechanical shock and environmental moisture. * **Encapsulation:** The internal cavity is filled with epoxy resin to provide insulation and vibration resistance. --- ### 3. Part Number Decoding (Typical) While naming conventions can vary slightly by manufacturer, the code usually breaks down as follows: 1. **10:** Often refers to the physical size or the sensitivity range (Pull-in Ampere Turns). 2. **JR:** Indicates the series (Jumbo/Standard Reed or specific mounting style). 3. **3A:** Refers to the contact configuration (e.g., Form A, SPST). 4. **R:** Typically stands for **RoHS Compliant**, meaning it is free from hazardous substances like lead. --- ### 4. Common Applications Because the 10JR-3A-R is hermetically sealed, it is ideal for harsh environments where dust, oil, or water might interfere with standard mechanical switches. * **Security Systems:** Door and window position sensors. * **Industrial Automation:** Limit switching for hydraulic cylinders or robotic arms. * **Automotive:** Liquid level sensing (when used with a magnetic float). * **Appliances:** Detecting if a lid or safety guard is closed. ---