The part number **A105P4CWCQ0Q** refers to a specific configuration of a subminiature toggle switch, likely manufactured by **C&K (now part of Littelfuse)** or a similar high-quality industrial component manufacturer. Below is the technical breakdown of the electronic and mechanical specifications for this component. --- ## 🔍 Technical Specifications | Parameter | Details | | :--- | :--- | | **Component Type** | Toggle Switch | | **Circuit Configuration** | SPDT (Single Pole Double Throw) | | **Switch Function** | ON-NONE-ON (Maintained) | | **Contact Rating** | 5A @ 120V AC or 28V DC; 2A @ 250V AC | | **Termination Style** | PC Pin (Through-hole mounting) | | **Actuator Style** | P4 (Flat Anti-rotation) | | **Bushing Type** | CW (Threaded, 0.250" diameter) | | **Contact Material** | Q (Silver contacts) | | **Operating Temp** | -30°C to +85°C | --- ## 🛠️ Detailed Component Breakdown ### 1. Circuitry: SPDT (A105) This is a **Single Pole, Double Throw** switch. It has one common terminal and two output terminals. In the "ON-NONE-ON" configuration, the common terminal is always connected to one of the two outputs; there is no stable center "OFF" position. ### 2. Actuator: P4 (Flat/Anti-rotation) The "P4" designation refers to the toggle handle. Unlike standard round toggles, this is a **flat actuator**. The "Anti-rotation" feature ensures the handle does not spin or twist during operation, providing a tactile, high-end feel often used in control panels. ### 3. Bushing and Seal: CW (Splashproof) The "CW" code indicates a threaded bushing with an **internal O-ring seal**. This provides a degree of environmental protection against moisture and dust entering the switch body through the actuator. ### 4. Contact Material: Q (Silver) The "Q" suffix specifies **Silver contacts**. * **Advantage:** Excellent conductivity and power handling (up to 5 Amps). * **Usage:** Best for power switching applications rather than low-level logic signals (where gold plating would be preferred to prevent oxidation). --- ## 📝 Terminal Logic The switch typically features three pins. The connection logic is as follows: | Switch Position | Terminal Connection | Status | | :--- | :--- | :--- | | **Up / Left** | 2-3 | Connected | | **Center** | N/A | No center position | | **Down / Right** | 2-1 | Connected | --- ## 💡 Typical Applications * **Industrial Controls:** Control panels requiring high reliability. * **Telecommunications:** Network equipment configuration. * **Test & Measurement:** Mode selection in laboratory instruments. * **Medical Equipment:** Power or function selection switches. ---