The **M3SDY-4-R** is a specific part number typically associated with the **M3 Series** of rotary switches or specialized electronic components, often manufactured by companies like **Copals Electronics** (now Nidec Components) or similar industrial hardware suppliers. Below is a breakdown of the electronic and mechanical specifications for this component category. --- ### 1. Component Overview The M3SDY-4-R is a **Rotary Selector Switch** designed for PCB (Printed Circuit Board) mounting. These are often used for logic switching, mode selection, or address setting in industrial electronics. | Feature | Specification (Typical) | | :--- | :--- | | **Type** | Rotary Switch / DIP Switch Alternative | | **Number of Positions** | 4 Positions | | **Orientation** | Side Actuation (Right Angle) | | **Mounting Type** | Through-Hole (THT) | | **Terminal Type** | Solder Pin | | **RoHS Compliant** | Yes (Indicated by the 'R' suffix) | --- ### 2. Detailed Electronic Specifications These parts are designed for low-current signal switching rather than high-power applications. * **Switching Capacity:** Usually rated around **100mA at 5V DC** (Logic level). * **Contact Resistance:** Typically less than **100mΩ** to ensure signal integrity. * **Insulation Resistance:** Minimum of **100MΩ** at 100V DC. * **Dielectric Strength:** Capable of withstanding **250V AC** for one minute. --- ### 3. Key Features and Mechanical Design The alphanumeric code provides specific details about its build: 1. **M3 Series:** Refers to the ultra-miniature size profile, saving space on dense circuit boards. 2. **Actuator Style (SDY):** This usually denotes a "Side-actuated" or "Right-angle" knob/shaft, allowing the user to change settings from the edge of the device enclosure. 3. **4-Position:** The internal cam allows for four distinct detent stops (e.g., positions 0, 1, 2, 3). 4. **Seal Construction:** Many "M3" switches are "Washable," meaning they have an internal O-ring or seal that prevents flux and cleaning fluids from entering the contacts during the soldering process. --- ### 4. Common Applications * **Industrial Controls:** Setting operation modes on a PLC or motor driver. * **Communications:** Selecting channels or addresses on a networking module. * **Medical Equipment:** Adjusting sensitivity levels on handheld diagnostic tools. * **Embedded Systems:** Hard-coding a device ID during assembly.