The **18AT-81-R** is a specific electronic component belonging to the **AT Series** of subminiature toggle switches, manufactured primarily by **Honeywell (Sensing and Productivity Solutions)**. These components are designed for high-reliability applications, often meeting military specifications. --- ## 1. Technical Specifications The following table summarizes the key electrical and mechanical characteristics of the 18AT-81-R: | Parameter | Specification | | :--- | :--- | | **Component Type** | Toggle Switch (Multi-pole) | | **Circuitry** | 8PDT (Eight Pole, Double Throw) | | **Action** | 2-Position (Maintained) | | **Current Rating** | ~5 Amps at 28V DC / 115V AC | | **Termination Style** | Solder Turret | | **Contact Material** | Silver / Gold Plated | | **Mounting Type** | Panel Mount (Bushings) | --- ## 2. Key Features and Design The 18AT series is unique because it is a **ganged assembly**. This means a single toggle lever operates multiple subminiature basic switches (often SM series switches) simultaneously. ### Internal Composition * **Basic Switches:** The "81" in the part number indicates the specific arrangement and type of internal micro-switches used. It typically houses 8 individual subminiature switches. * **Housing:** Built with corrosion-resistant stainless steel or high-grade plastics to withstand harsh environments. * **Sealing:** These units are often qualified for use in environments where dust or light splashing may occur, though they are primarily focused on high-density circuit switching. --- ## 3. Common Applications Due to its 8-pole configuration (the ability to switch 8 different circuits with one flick), this part is commonly used in: 1. **Aerospace & Defense:** Cockpit controls and communication equipment. 2. **Industrial Machinery:** Centralized control panels where multiple power or signal lines must be toggled at once. 3. **Marine Electronics:** Systems requiring high-reliability switching in compact spaces. 4. **Test Equipment:** For switching between multiple sensor inputs or signal paths. --- ## 4. Typical Wiring Diagram (8PDT) In an 8PDT configuration, the switch has 24 terminals (3 per pole). ```text Pole 1: [Terminal A] -- [Common] -- [Terminal B] Pole 2: [Terminal C] -- [Common] -- [Terminal D] ... (Repeated up to Pole 8) ```