The **A107P4CWCQ0Q** is a specific model of a **Miniature Toggle Switch** manufactured by **TE Connectivity (Alcoswitch)**. It is designed for high-reliability applications where space and environmental sealing are critical factors. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electronic and physical characteristics: | Feature | Specification | | :--- | :--- | | **Switch Function** | SPDT (Single Pole Double Throw) | | **Circuit configuration** | ON-NONE-ON | | **Contact Rating** | 5A @ 120VAC or 28VDC; 2A @ 250VAC | | **Termination Style** | PC Pin (Printed Circuit) | | **Actuator Style** | Large Toggle (P4) | | **Bushing Type** | 1/4-40 Threaded | | **Contact Plating** | Silver (standard for power switching) | | **Environmental Protection** | Splash-proof (CWC - Sealed) | --- ### 2. Breakdown of the Part Number The alphanumeric code provides a detailed map of the component's construction: * **A107**: The base series (A-Series) indicating a Single Pole (SP) configuration. The "07" suffix typically denotes the standard "ON-NONE-ON" logic. * **P4**: Refers to the **Actuator type**. In this case, it is a larger, heavy-duty toggle compared to the micro-toggle variants. * **CW**: Indicates a **Sealed/Splash-proof** construction. It includes an internal O-ring or sealing mechanism to prevent liquid or dust ingress from the front panel. * **CQ**: Specifies the **Contact Material**. "Q" typically represents Silver contacts, which are preferred for general power applications. * **0Q**: Standard packaging and factory finish codes. --- ### 3. Electronic Design Considerations #### Contact Resistance and Life * **Contact Resistance**: Usually rated at 10mΩ maximum initially. * **Dielectric Strength**: 1,000 Vrms at sea level. * **Electrical Life**: Rated for approximately 60,000 to 100,000 cycles at full load. #### Typical Applications Due to its sealed nature and PC pin termination, this switch is frequently found in: 1. **Industrial Controls**: Panels exposed to moisture or debris. 2. **Medical Equipment**: Devices requiring frequent cleaning/sanitization. 3. **Communication Gear**: Outdoor or ruggedized handheld units. 4. **Test Instrumentation**: PCB-mounted switches for mode selection. --- ### 4. Mounting Details The switch is designed for **Through-Hole Mounting** on a PCB. The threaded bushing allows it to be secured to a panel simultaneously, providing mechanical stability so that the solder joints do not bear the force of the toggle movement.