The part number **7101P3CWCQ** refers to a specific configuration of a high-quality **Toggle Switch** manufactured by **C&K** (now part of Littelfuse). It belongs to the 7000 Series, which is a standard in the electronics industry for miniature switches. --- ### 1. Part Number Breakdown To understand the electronic and mechanical properties, we can decode the nomenclature: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **7101** | Model / Pole | Single Pole, Double Throw (SPDT), On-On function. | | **P3** | Actuator | Flatted actuator, 11.43mm (.450") high. | | **CW** | Bushing | Threaded, 0.250" diameter with an O-ring for water/dust protection. | | **C** | Terminals | PC thru-hole (Printed Circuit) pins. | | **Q** | Contact Material | Silver contacts (rated for power/high current). | --- ### 2. Technical Specifications This switch is designed for durability and specific electrical performance: * **Electrical Rating:** 5 Amps @ 120 V AC or 28 V DC; 2 Amps @ 250 V AC. * **Contact Resistance:** Below 10 mΩ (initial). * **Dielectric Strength:** 1,000 Vrms at sea level. * **Operating Temperature:** -30°C to +85°C. * **Mechanical Life:** 100,000 make-and-break cycles. * **Environmental Protection:** The "CW" designation indicates a **splash-proof** or water-resistant seal at the bushing, making it suitable for front panels exposed to moisture. --- ### 3. Application Use Cases Because of its SPDT "On-On" configuration and silver contacts, this part is commonly used in: 1. **Industrial Controls:** Switching between two power states or signal paths. 2. **Instrumentation:** Panel-mounted controls for testing equipment. 3. **Medical Equipment:** Reliable user interfaces where liquid resistance is needed. 4. **Audio/Visual:** Input selection or power toggles. --- ### 4. Circuit Diagram (SPDT) The internal structure connects the common terminal to one of two positions: ```text Position 1 (Up): Terminal 2 connected to Terminal 3 Position 2 (Down): Terminal 2 connected to Terminal 1 Center (Off): N/A (This model has no center-off position) ```