## FTR-K3JB005W Electronic Part Overview The **FTR-K3JB005W** is a high-capacity power relay manufactured by **Fujitsu Components**. It is specifically designed for high-current applications such as automotive systems, renewable energy (inverters), and industrial controls. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Manufacturer** | Fujitsu Components | | **Series** | FTR-K3 | | **Contact Form** | 1 Form A (SPST-NO) | | **Nominal Coil Voltage** | 5V DC | | **Max Switching Current** | 25A | | **Max Switching Voltage** | 250V AC / 30V DC | | **Contact Material** | Silver Tin Oxide (AgSnO2) | | **Mounting Type** | PCB Through-Hole | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Physical and Structural Design * **Construction:** The unit is "Plastic Sealed," meaning it is designed to resist environmental contaminants and soldering fluxes. * **Insulation:** It features a high insulation distance (creepage and clearance) between the coil and contacts, typically around **8.5mm**, providing a high dielectric strength (approx. 5,000V AC). * **Internal Circuitry:** As a DC-actuated relay, it uses an electromagnetic coil to close a mechanical switch. --- ### 3. Pinout and Diagram Logic While specific pin layouts are found in the datasheet, the general logic follows: ```text [Coil Pin 1] ----( Coil )---- [Coil Pin 2] [Contact A] ----( Switch )--- [Contact B] ``` ### 4. Typical Applications * **Photovoltaic (PV) Inverters:** Used for grid disconnection and AC output control. * **Automotive Electronics:** Handling high-current loads like heaters or fans. * **Power Supplies:** Serving as a primary power switch or protection circuit. * **Home Appliances:** High-power units like air conditioners and water heaters. --- ### 5. Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **FTR-K3** | Series Name (High Capacity Power Relay) | | **J** | Contact Material / High Heat Resistance | | **B** | Plastic Sealed Type | | **005** | Nominal Coil Voltage (5 Volts) | | **W** | Contact Gap / Special Specification |