The **D449-R1LD-G2** is a specific model of a **Miniature Micro Switch** manufactured by **Cherry (now ZF Electronics)**. These switches are renowned for their high reliability and precision in sensing and limit-control applications. --- ### 1. Technical Specifications Below are the primary electronic and mechanical parameters for this component: | Feature | Specification | | :--- | :--- | | **Switch Type** | Snap Action / Micro Switch | | **Circuitry** | SPDT (Single Pole Double Throw) | | **Current Rating** | 10A (at 250VAC) | | **Actuator Type** | Simulated Roller Lever | | **Termination Style** | Quick Connect / Solder Terminals | | **Operating Force** | ~75g (Approx. 0.74 N) | | **Contact Material** | Silver Alloy (AgNi) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Key Components & Construction The D44 series construction involves several critical sub-parts that determine its performance: * **Actuator (Simulated Roller):** The "R1" in the part number signifies a specialized lever. Unlike a standard straight lever, the simulated roller has a curved tip that reduces friction when used with cams or sliding objects. * **Snap-Action Mechanism:** Uses a beryllium copper spring. This ensures that the contacts move rapidly to the alternate position regardless of the speed of the external physical actuation, preventing "arcing." * **Housing:** Made from high-grade Thermoplastic (PET/PBT), providing high dielectric strength and resistance to heat. * **Terminal Design:** The "LD" suffix often denotes specific terminal orientations or lengths designed for PCB or panel mounting. --- ### 3. Connection Diagram (SPDT) The internal wiring follows a standard 3-pin configuration: ```text Pin 1: COM (Common) Pin 2: NC (Normally Closed) Pin 3: NO (Normally Open) Default State: COM is connected to NC. Actuated State: COM is connected to NO. ``` ### 4. Applications This part is commonly found in the following environments: 1. **Home Appliances:** Door interlocks for microwaves or washing machines. 2. **Industrial:** Limit switches for 3D printers, CNC machines, or conveyor belts. 3. **Automotive:** Gear shifters or seat adjustment sensors. ---