The **A10705-RSC-QF** is a specific electronic component manufactured by **CK (C&K Components)**. It belongs to the **A Series** of rotary switches, which are widely used in industrial, medical, and consumer applications for circuit switching and mode selection. ### 1. Technical Specifications Below are the primary electrical and mechanical specifications for this component: | Feature | Specification | | :--- | :--- | | **Component Type** | Rotary Switch | | **Number of Positions** | 7 Positions | | **Number of Poles** | 1 Pole | | **Actuator Type** | Flatted (Shaft) | | **Contact Rating** | 2.5A @ 125 VAC; 350mA @ 125 VDC | | **Termination Style** | PC Pin (Through-hole) | | **Mounting Type** | Panel Mount / Through-hole | | **Contact Material** | Silver Plated | | **Operating Temperature** | -30°C to +85°C | --- ### 2. Breakdown of Part Number Nomenclature Understanding the suffix codes helps identify the specific physical attributes of the part: * **A107**: The series prefix. "A" denotes the 1-4 pole rotary switch series, and "107" indicates a 1-pole, 7-position configuration. * **05**: Refers to the actuator length (0.500 inches). * **RSC**: * **R**: Shorting (Make-before-break) contact arrangement. * **SC**: Solder clocking/Standard circuit. * **QF**: * **Q**: Silver contact material (for power switching). * **F**: RoHS compliant / Lead-free finish. --- ### 3. Key Electronic Characteristics #### Shorting vs. Non-Shorting (Make-Before-Break) The "R" in the part number indicates a **Shorting** contact. This means that as you turn the switch, the wiper connects to the next position before it disconnects from the current one. This is critical in audio or sensitive electronic applications to prevent "pops" or transient spikes during switching. #### Contact Material The **Silver (Q)** plating allows for higher current carrying capacities compared to gold. It is ideal for power applications but may oxidize over long periods if not used in a "wiping" motion, though the rotary action of this switch is self-cleaning. #### Indexing Angle The standard indexing for this series is usually **30°**, meaning each "click" of the 7 positions represents a 30-degree rotation of the shaft. --- ### 4. Typical Applications * **Industrial Equipment:** Mode selection for heavy machinery. * **Test & Measurement:** Selecting voltage ranges on multimeters or signal generators. * **Medical Devices:** Control interfaces for diagnostic equipment. * **Audio Gear:** Channel switching or gain stage selection.