The **A10205-RSC-QF** is a high-performance, rotary switch manufactured by **C&K Components** (now part of Littelfuse). It belongs to the A-Series, which is widely recognized for its versatility in industrial and consumer electronic applications. --- ### 1. Key Technical Specifications Below are the primary electrical and mechanical characteristics of the A10205-RSC-QF: | Feature | Specification | | :--- | :--- | | **Contact Configuration** | SPDT (Single Pole, Double Throw) | | **Number of Positions** | 2 Positions | | **Contact Rating (AC)** | 2.5A @ 125V AC | | **Contact Rating (DC)** | 350mA @ 125V DC | | **Contact Resistance** | 20 mΩ maximum (initial) | | **Insulation Resistance** | 10^9 Ω minimum | | **Dielectric Strength** | 1,000 Vrms at sea level | | **Operating Temperature** | -30°C to +85°C | | **Mechanical Life** | 15,000 cycles | --- ### 2. Physical and Material Attributes The part number suffix "RSC-QF" defines specific physical traits: * **Actuator Style (10):** Features a 1-inch (25.4mm) flatted shaft, allowing for easy mounting of standard control knobs. * **Termination (RSC):** Indicates **PC Thru-hole** terminals with a specific circular footprint, designed to be soldered directly onto a Printed Circuit Board (PCB). * **Contact Material (Q):** Uses **Silver** contacts. Silver provides excellent conductivity and is ideal for power switching (up to 2.5 Amps). * **Mounting Style (F):** Refers to the "Fast-on" or specific bushing mounting hardware included with the unit. --- ### 3. Functional Breakdown * **Shorting vs. Non-Shorting:** This model typically features **Non-Shorting** (Break-before-make) contacts. This ensures that when switching between positions, the first connection is completely broken before the second is established, preventing momentary electrical shorts. * **Indexing:** It has a **30-degree indexing** angle, providing a tactile "click" and firm detent when moving between the two positions. --- ### 4. Applications Due to its robust silver contacts and PCB-mount design, it is commonly found in: 1. **Test Equipment:** For switching between power states or signal modes. 2. **Industrial Controls:** Used in panels to toggle between "Auto" and "Manual" modes. 3. **Consumer Electronics:** High-end audio equipment or household appliances for mode selection. ---