The **D4C0106N-R30F** is a precision **electromechanical rotary switch** manufactured by Electroswitch (specifically under their D4 series). These components are designed for high-reliability applications where manual switching of multiple circuits is required. --- ## 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical and physical characteristics: | Feature | Specification | | :--- | :--- | | **Component Type** | Rotary Switch | | **Number of Positions** | 2 to 6 (Adjustable) | | **Number of Poles** | 1 Pole | | **Number of Decks** | 1 Deck | | **Contact Timing** | Non-Shorting (Break-before-make) | | **Current Rating** | 0.5A @ 125VAC; 0.25A @ 28VDC | | **Termination Style** | Solder Lug | | **Angle of Throw** | 30 Degrees | --- ## 2. Key Electronic Components & Features ### A. Contact Mechanism * **Non-Shorting (BBM):** This ensures that the circuit is physically disconnected from one terminal before it connects to the next. This prevents momentary electrical shorts between adjacent circuits. * **Wiping Contacts:** The internal contacts are designed to "wipe" across the surface, which helps clear oxidation and debris, maintaining low contact resistance over time. ### B. Construction Materials * **Insulation:** Usually constructed from **Diallyl Phthalate (DAP)** or ceramic, providing high dielectric strength and heat resistance. * **Plating:** Contacts are typically **silver-plated** or gold-flashed to ensure excellent conductivity and corrosion resistance. ### C. Mechanical Interface * **Index Mechanism:** It utilizes a dual-ball side-thrust index for a crisp, "clicky" tactile feel and precise positioning. * **Adjustable Stops:** The "R30F" designation often implies a 30-degree throw. These switches frequently come with a "stop" washer that allows the user to limit the number of positions (e.g., locking it so it only rotates between 3 positions instead of 6). --- ## 3. Applications Due to its rugged construction and precision, this part is commonly found in: 1. **Test & Measurement Equipment:** For selecting different frequency ranges or input modes. 2. **Audio Gear:** Input selectors for high-end preamplifiers or mixers. 3. **Industrial Controls:** Mode selection for heavy machinery where digital touchscreens are impractical. 4. **Avionics:** Control panels requiring physical, reliable feedback. ---