The **4P3N-R** is a specific model of a **Rotary Switch**. It is widely used in electronic circuits where a user needs to select between different operating modes or signal paths. --- ### 1. Breakdown of the Model Name (4P3N) The alphanumeric code describes the internal configuration of the switch: | Component | Meaning | Description | | :--- | :--- | :--- | | **4P** | **4 Poles** | This means the switch can control 4 independent circuits simultaneously. | | **3N** | **3 Notes/Positions** | This indicates there are 3 different "stops" or positions the knob can turn to. | | **-R** | **Rotary** | Confirms the physical form factor is a rotating shaft. | --- ### 2. Technical Specifications While specific brands (like Lorlin or Alpha) may have slight variations, a standard 4P3N-R typically follows these specs: * **Switching Type:** Non-shorting (BBM - Break Before Make). The connection to the first position is broken before the second is made. * **Electrical Rating:** Usually rated for **250mA at 125V AC** or **150mA at 250V AC**. * **Contact Resistance:** Typically $< 20m\Omega$. * **Mounting:** Panel mount with a threaded bush and a nut. * **Shaft Type:** Usually a "D-shaft" or "Splined/Knurled shaft" made of plastic or metal. --- ### 3. Pin Configuration & Wiring Since it is a **4-Pole, 3-Position** switch, the underside will typically have **16 pins** in total: 1. **Common Pins (4):** Labeled as A, B, C, and D (or 1, 2, 3, 4 center). Each pole has its own common pin. 2. **Output Pins (12):** Each of the 4 poles has 3 corresponding output pins ($4 \text{ poles} \times 3 \text{ positions} = 12$). #### Wiring Logic Table: | If Position is set to: | Pole 1 connects | Pole 2 connects | Pole 3 connects | Pole 4 connects | | :--- | :--- | :--- | :--- | :--- | | **Position 1** | Common A → Pin 1 | Common B → Pin 4 | Common C → Pin 7 | Common D → Pin 10 | | **Position 2** | Common A → Pin 2 | Common B → Pin 5 | Common C → Pin 8 | Common D → Pin 11 | | **Position 3** | Common A → Pin 3 | Common B → Pin 6 | Common C → Pin 9 | Common D → Pin 12 | --- ### 4. Common Applications * **Audio Equipment:** Selecting between four different stereo inputs (where 2 poles are used for Left/Right and the other 2 for grounding or LED indicators). * **Voltage Selection:** Switching between different transformer taps (e.g., 110V, 220V, 240V). * **Industrial Controls:** Mode selection (Manual / Auto / Off). * **DIY Electronics:** Fan speed controllers or multi-range multimeters. ---