Based on the part number **A105K1CWCQ0Q**, this is a specific electronic component manufactured by **C&K (now part of Littelfuse)**. It belongs to the **A Series** of rotary switches. --- ## 1. Technical Specifications The part number is a coded string where each character defines a specific physical or electrical property. | Feature | Specification | Description | | :--- | :--- | :--- | | **Series** | A | 1-4 Pole Rotary Switch | | **Function** | 105 | 1 Pole, 5 Positions (30° Indexing) | | **Actuator** | K1 | Knurled with Slot (Plastic) | | **Termination** | CW | PC Thru-hole, right angle | | **Contact Material** | C | Copper alloy, silver plated | | **Seal** | Q | Sealed (Process sealed) | | **RoHS** | Q | Compliant | --- ## 2. Key Component Breakdown ### A. Electrical Ratings * **Contact Rating:** Typically 2.5 Amps at 125V AC or 350mA at 125V DC. * **Dielectric Strength:** 1,000 Vrms at sea level. * **Contact Resistance:** Below 20 mΩ initially. * **Insulation Resistance:** $10^9$ Ω min. ### B. Mechanical Features * **Indexing:** 30 degrees between positions. * **Number of Poles:** 1 (Single Pole). * **Number of Positions:** 5 (Continuous rotation or stops can be added). * **Mounting Type:** Through-hole (PCB mount) with a right-angle orientation, meaning the dial is adjusted perpendicular to the board. ### C. Material & Durability * **Housing:** Glass filled 6/6 nylon (UL 94V-0). * **Actuator:** Zinc alloy or glass filled nylon. * **Environment:** The "Q" designation often implies a seal that protects the contacts during wave soldering and cleaning processes. --- ## 3. Typical Applications These switches are commonly found in industrial and consumer electronics where multiple circuit paths must be selected manually: * **Test and Measurement:** Mode selection on multimeters or oscilloscopes. * **Consumer Appliances:** Speed or heat settings on fans/heaters. * **Medical Equipment:** Device mode controls. * **Audio/Visual:** Channel selection or input routing. ---