The **KAP104VT** is a high-performance **Tactile Switch** (specifically a Piano-type DIP switch) commonly used in industrial electronics, telecommunications, and consumer devices to set configuration parameters or manual logic states. --- ### 1. Technical Specifications The electrical characteristics are critical for ensuring the switch can handle the signal load without degradation. | Parameter | Specification | | :--- | :--- | | **Switch Type** | Piano Type DIP Switch | | **Number of Positions** | 4 Positions (SPST) | | **Contact Rating (Switching)** | 25mA at 24VDC | | **Contact Rating (Non-Switching)** | 100mA at 50VDC | | **Contact Resistance** | 50mΩ Max (Initial) | | **Insulation Resistance** | 100MΩ Min at 500VDC | | **Dielectric Strength** | 500VAC for 1 minute | --- ### 2. Key Electronic Components & Materials The reliability of the KAP104VT is derived from its internal material composition: * **Actuator:** Usually made of high-temperature thermoplastic (PBT or Nylon) to withstand soldering heat. * **Base & Cover:** High-temperature UL94V-0 rated plastic. * **Contacts:** Gold-plated over Nickel. Gold is used because it prevents oxidation, ensuring low contact resistance over long periods. * **Terminals:** Brass or Copper alloy with tin or gold plating for high solderability. --- ### 3. Physical Configuration The "VT" suffix usually denotes a specific mounting style: * **V:** Vertical orientation (Piano style), where the levers are toggled from the side rather than the top. * **T:** Tape or Tube packaging (industry standard for automated SMT or THT placement). --- ### 4. Typical Applications The KAP104VT is used in circuits where "Set and Forget" logic is required: 1. **Address Setting:** Setting the unique ID for a device on a bus (like RS-485 or DMX). 2. **Configuration:** Switching between different operating modes (e.g., 110V vs 220V logic sensing). 3. **Security:** Encoding a manual key for garage door openers or remote controls. --- ### 5. Circuit Diagram (Internal) Each of the 4 positions acts as a simple independent switch. ```text OFF [Open] ON [Closed] (1) o (1) o \ | (2) o (2) o ```