The **SV-154-R** is a specific model of a **Miniature Micro Switch** (often associated with the V-Series or similar industrial standards). These components are fundamental in electronics for physical sensing and circuit switching. --- ### 1. Technical Specifications The electrical characteristics define how the switch can be integrated into a circuit without failure. | Feature | Description | | :--- | :--- | | **Switch Type** | Snap-Action Micro Switch | | **Actuator Type** | Simulated Roller Lever | | **Circuit Configuration** | SPDT (Single Pole Double Throw) | | **Current Rating** | Typically 5A to 15A (depending on manufacturer) | | **Voltage Rating** | 125V / 250V AC | | **Contact Material** | Silver Alloy (common) | --- ### 2. Internal Electronic Parts The SV-154-R consists of several precision-engineered internal components: * **The Actuator (Roller Lever):** The external part that receives physical pressure. The "R" in the model number usually signifies the **Roller** or **Simulated Roller** design, which reduces friction when the trigger mechanism moves past it. * **The Plunger:** A small button under the lever that transfers the mechanical force to the internal spring. * **Snap-Action Spring:** A high-tension beryllium copper or stainless steel spring that ensures the contacts move instantly, preventing electrical "arcing." * **Terminal Pins:** * **COM (Common):** The input power pin. * **NO (Normally Open):** The circuit is off until the lever is pressed. * **NC (Normally Closed):** The circuit is on until the lever is pressed. --- ### 3. Typical Wiring Configuration Since it is an **SPDT** switch, it can be wired in two primary ways: ```cpp // Logic 1: Normally Open (Device turns ON when pressed) [Power Source] -> [COM Terminal] [NO Terminal] -> [Load/LED] -> [Ground] // Logic 2: Normally Closed (Device turns OFF when pressed) [Power Source] -> [COM Terminal] [NC Terminal] -> [Load/LED] -> [Ground] ``` --- ### 4. Common Applications * **Limit Switching:** Used in CNC machines or 3D printers to detect the "Home" position. * **Safety Interlocks:** Detecting if a door or a microwave lid is closed. * **Industrial Automation:** Counting objects on a conveyor belt as they roll over the lever. ---