The part number **2-1P3N-R** typically refers to a specific type of **Rotary Switch**. These components are used to control electrical circuits by rotating a knob to different positions. Below is a detailed breakdown of the technical specifications and characteristics of this electronic part. --- ### 1. Part Number Breakdown The alphanumeric code provides specific information about the switch's internal configuration: | Component Segment | Meaning | | :--- | :--- | | **2** | Usually refers to the number of **Poles** (the number of separate circuits the switch controls). | | **1P3N** | **1 Pole, 3 Positions** (N stands for non-shorting in some manufacturer schemes). | | **R** | Often indicates **RoHS Compliance** or a specific **Rotary** mounting style. | --- ### 2. Technical Specifications While exact specs can vary slightly by manufacturer (such as Alpha or C&K), the standard parameters for this class of switch are: * **Switch Type:** Rotary. * **Circuit Configuration:** DP3T (Double Pole, 3 Throw) or 1P3T depending on the specific series prefix. * **Contact Timing:** **Non-Shorting (Break-Before-Make)**. This means the connection to the first position is broken before the connection to the second position is established. * **Electrical Rating:** Typically 0.3A at 125V AC or 1A at 30V DC. * **Rotational Angle:** Usually 30° or 45° between clicks (detents). * **Mounting Type:** Through-hole (PCB mount) or Panel Mount with a threaded bushing. --- ### 3. Key Components A rotary switch consists of several physical layers: 1. **The Shaft:** The metal or plastic rod that the user turns. 2. **The Rotor:** The internal moving part that carries the electrical contact. 3. **The Stator:** The stationary base where the terminals are located. 4. **Detent Mechanism:** The spring-loaded ball or "clicker" that holds the switch in a specific position. --- ### 4. Common Applications These switches are used in devices where multiple operational modes are required: * **Audio Equipment:** Selecting between Input sources (CD, Aux, Phono). * **Test Equipment:** Changing ranges on a multimeter (Voltage, Amperage, Ohms). * **Industrial Controls:** Selecting motor speeds or operating modes (Manual, Auto, Off). * **Home Appliances:** Fan speed controllers or oven mode selectors. --- ### 5. Wiring Diagram Concept In a **1P3N** (1 Pole, 3 Position) setup, the wiring logic is as follows: ```text Pin C (Common) ───┐ │ ├─ Position 1 (Output A) ├─ Position 2 (Output B) └─ Position 3 (Output C) ```