The **D4C0112N-R30A** is a specialized, high-performance rotary switch manufactured by **Electroswitch**. It is part of the D4 series, designed for heavy-duty industrial and military-grade applications where reliability and precision are critical. ### Technical Specifications | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Electroswitch | | **Series** | D4 Series | | **Circuitry/Poles** | Single Pole (1 Pole) | | **Positions** | 12 Positions | | **Switching Type** | Non-Shorting (Break-Before-Make) | | **Contact Material** | Silver Alloy | | **Mounting Type** | Panel Mount | | **Termination Style** | Solder Lug | | **Electrical Rating** | 0.5A @ 125VAC | --- ### Core Component Breakdown #### 1. Switching Mechanism (Non-Shorting) The "N" in the part number indicates a **Non-Shorting** (Break-before-make) contact. This means the connection to the first position is completely severed before the connection to the next position is established. This is crucial for avoiding momentary short circuits between two different input signals. #### 2. Number of Positions (12) This switch provides a full 360-degree rotation capability (or limited by stops) with 12 distinct detent positions. It is ideal for multi-channel selection or complex mode switching in electronic equipment. #### 3. Rugged Construction The D4 series is known for its "open-frame" construction. This allows for: * **Visual Inspection:** Easy to see the state of the contacts. * **Customization:** Additional "decks" or sections can often be added to the same shaft to control multiple circuits simultaneously. #### 4. Contact Materials The use of **Silver Alloy** contacts ensures low contact resistance and high conductivity. The "R30A" suffix typically refers to specific hardware configurations, such as the shaft length, diameter, or the angle of throw (30 degrees between each position). --- ### Common Applications * **Test & Measurement:** Calibration equipment and multi-meters. * **Audio/Visual:** High-end audio channel selectors or gain controls. * **Industrial Controls:** Machine mode selection (Off/Auto/Manual/Diagnostic). * **Military/Aerospace:** Communications equipment where mechanical reliability is preferred over digital switching.