The **D4G0112N-R30C** is a high-quality, professional-grade rotary switch manufactured by **Electroswitch**. This specific part belongs to their D4 Series, which is known for its rugged construction and versatility in industrial and instrumentation applications. --- ### Technical Specifications The following table outlines the primary electrical and mechanical characteristics of the D4G0112N-R30C: | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Electroswitch | | **Circuit Configuration** | SP12T (Single Pole, 12 Positions) | | **Number of Decks** | 1 | | **Angle of Throw** | 30° | | **Contact Timing** | Non-Shorting (Break-Before-Make) | | **Current Rating** | 0.5A @ 125VAC | | **Voltage Rating** | 125 VAC / 28 VDC | | **Mounting Type** | Panel Mount | | **Termination Style** | Solder Lug | --- ### Key Features & Components #### 1. Switching Logic (SP12T) This part is a **Single Pole, 12 Position** switch. It has one common input that can be routed to any of the twelve output terminals. The "12N" in the part number indicates 12 positions, Non-shorting. #### 2. Non-Shorting Contacts The "N" designation stands for **Non-shorting** (Break-Before-Make). This means that during the transition from Position 1 to Position 2, the connection to Position 1 is fully broken before the connection to Position 2 is established. This prevents temporary electrical shorts between adjacent circuits. #### 3. 30° Indexing The switch has an angle of throw of 30 degrees. This provides a clear tactile "click" or detent between each of the 12 positions, completing a full circle (30° x 12 = 360°). #### 4. Contact Materials Electroswitch typically uses **Silver-plated brass** or **Silver alloy** contacts for the D4 series to ensure low contact resistance and long-term reliability. --- ### Typical Applications Due to its robust design, the D4G0112N-R30C is commonly used in: * **Test and Measurement Equipment:** Selecting between different sensor inputs or frequency ranges. * **Audio Equipment:** Input selectors or gain stage switching. * **Industrial Controls:** Mode selection (Manual, Auto, Off, etc.) on heavy machinery. * **Avionics:** Cockpit instrumentation where reliability under vibration is critical. --- ### Wiring Example (Pseudo-Code Logic) If you were using this switch to select between various resistors in a circuit, the logic would look like this: ```c // Conceptual logic for a 12-position selector switch (current_position) { case 1: activate_circuit(A); break; case 2: activate_circuit(B); break; // ... up to 12 case 12: activate_circuit(L); break; default: open_circuit(); } ```