The **CS-12A-R** is an electronic component manufactured by **Nidec Components (formerly Copal Electronics)**. It belongs to the category of rotary selector switches designed for surface mount or through-hole applications on printed circuit boards (PCBs). ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Manufacturer** | Nidec Components (Copal) | | **Type** | Rotary Selector Switch | | **Number of Positions** | 2 (Binary/Simple Selection) | | **Contact Timing** | Non-Shorting (Break-before-make) | | **Circuit Type** | SPDT (Single Pole Double Throw) | | **Current Rating** | 100mA @ 16VDC | | **Mounting Type** | Through-hole (R-suffix denotes specific lead forming) | | **Washability** | Washable (Sealed construction) | --- ### 2. Physical Construction and Design The CS-12A-R is built to withstand industrial environments while maintaining a small footprint. * **Rotor/Actuator:** Usually features a screwdriver slot or a small knob to change positions. * **Sealing:** The device is typically O-ring sealed or uses epoxy resin to ensure it is **washable**. This allows the PCB to be cleaned with solvents after soldering without damaging the internal contacts. * **Housing:** High-temperature plastic (usually Polyphenylene Sulfide - PPS) to resist soldering heat. --- ### 3. Pinout and Circuit Configuration The "12" in the part number signifies a 1-pole, 2-position configuration. * **Common Terminal:** One pin acts as the input. * **Output Terminals:** Depending on the rotation, the common pin connects to either Terminal 1 or Terminal 2. * **Internal Logic:** ```text Position A: Pin C connected to Pin 1 Position B: Pin C connected to Pin 2 ``` --- ### 4. Typical Applications Because of its small size and reliability, the CS-12A-R is commonly used for: * **Mode Selection:** Switching between "Auto" and "Manual" modes in industrial controllers. * **Address Setting:** Simple binary address configuration for sensors. * **Signal Routing:** Diverting a low-current signal between two different paths on a PCB. * **Maintenance Switches:** Disabling certain features during diagnostic checks. --- ### 5. Part Number Breakdown * **CS:** Product Series (Rotary Selectors) * **12:** 1-pole, 2-positions * **A:** Actuator type (often refers to top-actuated) * **R:** Packaging/Lead Style (Tape and Reel or specific lead bend)