The **KFS-42-R/Q** typically refers to a specialized **Push Button Switch** (often categorized as a "Push-Pull" or "Emergency" style component) commonly found in industrial control panels, medical equipment, or high-end consumer electronics. --- ### 1. Technical Specifications The part number follows a modular convention used by manufacturers like *DIP* or *Kailh* (depending on the specific series). Below are the typical electronic characteristics: | Parameter | Specifications | | :--- | :--- | | **Rated Voltage** | AC 125V / 250V | | **Rated Current** | 3A to 5A (Typical) | | **Contact Resistance** | $\le$ 50m$\Omega$ | | **Insulation Resistance** | $\ge$ 100M$\Omega$ (at 500V DC) | | **Dielectric Strength** | 1500V AC per minute | | **Mechanical Life** | 100,000 cycles minimum | --- ### 2. Suffix Breakdown (R/Q) Electronic components use suffixes to define physical or functional variations: * **R (Red):** Usually indicates the color of the actuator (button head). In safety applications, "R" is standard for "Stop" or "Emergency" functions. * **Q (Quick Connect):** Refers to the terminal type. "Q" usually denotes **Quick-Connect/Solder terminals** (fast-on lugs) rather than PC-pin mounting. --- ### 3. Internal Construction The KFS series is built using several key sub-components: 1. **Contact Block:** High-conductivity copper or silver alloy to prevent arcing and ensure a reliable signal. 2. **Spring Mechanism:** Provides the tactile feedback and ensures the switch returns to its original state (if momentary) or stays locked (if latching). 3. **Housing:** Made of flame-retardant (UL94V-0 rated) plastics like PBT or Nylon 66. 4. **Terminals:** Usually silver or gold-plated to prevent oxidation in industrial environments. --- ### 4. Circuit Diagram Representation In an electrical schematic, the KFS-42-R/Q is represented as a standard SPST (Single Pole Single Throw) or SPDT (Single Pole Double Throw) switch. ```text Normal State (Open) Terminal A ----/ ---- Terminal B (Switch) ``` ### 5. Common Applications * **Emergency Cut-offs:** Due to the prominent red (R) head. * **Industrial Interlocks:** Used to detect if a panel or door is closed. * **Small Appliances:** Vacuum cleaners, power tools, or medical diagnostic devices. ---