The **MH38TBD-R** is a specific electronic component typically identified as a **Micro-Switch** or **Snap Action Switch**, often utilized in consumer electronics, automotive controls, and industrial machinery. It is designed to actuate with very little physical force through the use of a tipping-point mechanism. --- ### 1. Key Technical Specifications The following table outlines the general electronic and physical characteristics of this series: | Parameter | Description / Typical Value | | :--- | :--- | | **Component Type** | Micro-Switch / Snap Action Switch | | **Contact Configuration** | SPDT (Single Pole Double Throw) | | **Current Rating** | Typically 0.1A to 5A (Voltage dependent) | | **Voltage Rating** | 125V / 250V AC | | **Actuator Type** | Lever / Roller Lever (depending on the "R" suffix) | | **Terminal Type** | Solder or PCB Mount | | **Operating Force** | Low (approx. 50gf to 150gf) | --- ### 2. Electronic Functionality The MH38TBD-R functions as a mechanical-to-electrical transducer. Its operation is defined by three primary pins: 1. **COM (Common):** The input point where the current enters. 2. **NO (Normally Open):** The circuit is broken until the lever is pressed. 3. **NC (Normally Closed):** The circuit is complete until the lever is pressed. When the external lever is depressed, an internal spring "snaps" the contacts from the NC position to the NO position almost instantaneously. This minimizes **arcing** and ensures a clean electrical signal, which is critical for digital logic circuits. --- ### 3. Suffix Breakdown: "TBD-R" In electronic part numbering, these suffixes usually denote specific physical variations: * **TBD:** Often refers to the terminal style (e.g., Turret or Threaded) or a specific manufacturing batch code. * **-R:** Usually signifies a **Roller** actuator. Instead of a flat metal leaf, a small plastic or metal wheel is attached to the end of the lever to reduce friction against moving parts (like cams). --- ### 4. Common Applications * **Door Interlocks:** Detecting if a microwave or 3D printer door is closed. * **Limit Switches:** Preventing a CNC machine or motorized gate from moving past its physical bounds. * **User Interface:** Tactile buttons in industrial control panels.