Based on the part number provided, **A113P4CWCQ0Q**, this corresponds to a high-quality **Sub-Miniature Toggle Switch** manufactured by **APEM** (a leading manufacturer of human-machine interfaces). Below is the technical breakdown of its electronic and mechanical parts. --- ## 1. Component Specifications This switch is designed for PCB mounting and features specific materials for high reliability. | Feature | Specification | | :--- | :--- | | **Manufacturer** | APEM | | **Switch Type** | Toggle Switch | | **Configuration** | SPDT (Single Pole Double Throw) | | **Switching Logic** | ON-NONE-ON | | **Current Rating** | 6A @ 125VAC / 3A @ 250VAC | | **Terminal Type** | PC Pins (Straight through-hole) | | **Contact Plating** | Silver (standard for high-current applications) | --- ## 2. Part Number Breakdown The alphanumeric string defines the physical and electrical characteristics of the part: * **A1**: Series designation (A-Series Miniature Toggle). * **13**: SPDT On-None-On function. * **P4**: Refers to the actuator (lever) style and length. * **CW**: Refers to the bushing type (typically threaded or splash-proof). * **C**: Terminal style (PC terminals). * **Q**: Contact material (typically Silver). * **0Q**: Packaging or specific finishing code. --- ## 3. Key Electronic Materials The internal construction involves several critical electronic components: ### A. Contact Mechanism * **Silver Contacts:** The "Q" in the part number indicates silver contacts. Silver provides the best electrical conductivity and is ideal for power applications (mains voltage), though it may tarnish slightly over time in low-current signal applications. * **Moving Blade:** A copper alloy blade that physically snaps between the two output terminals. ### B. Housing and Insulation * **Diallyl Phthalate (DAP):** The molded case is usually made of DAP, a high-strength plastic with excellent electrical insulation properties and high heat resistance during soldering. * **Bushing:** The metal neck that supports the toggle, usually made of nickel-plated brass. --- ## 4. Application Use Cases Due to its SPDT (Single Pole Double Throw) nature, this switch is commonly used for: 1. **Power Selection:** Switching a device between two power sources (e.g., Battery vs. DC Wall Jack). 2. **Signal Routing:** Directing an audio or data signal between two different paths. 3. **Industrial Controls:** Heavy-duty panel switching for machinery. ---