The **FTR-K3JB005W-NIL** is a high-power PCB relay manufactured by Fujitsu (Takamisawa). It is specifically designed for high-current applications and is widely used in power management for appliances and industrial equipment. --- ### 1. Key Technical Specifications The following table outlines the core electrical and mechanical characteristics of the relay: | Feature | Specification | | :--- | :--- | | **Contact Form** | 1 Form A (SPST-NO) | | **Nominal Coil Voltage** | 5V DC | | **Max. Switching Current** | 16A | | **Max. Switching Voltage** | 250V AC | | **Coil Power Consumption** | ~780 mW | | **Contact Material** | Silver Tin Oxide (AgSnO2) | | **Dielectric Strength** | 5,000V AC (between coil and contacts) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Physical Construction and Pins The "K3" series is known for its **slim-type profile** and high insulation properties. - **Pins:** It typically features 4 pins (2 for the coil, 2 for the single-pole contact). - **Insulation:** It offers a high insulation distance (Creepage and Clearance) of 8mm between the coil and the contacts. - **Sealing:** The "W" in the suffix usually indicates a flux-tight (vented) or wash-tight construction, allowing it to survive wave soldering processes. --- ### 3. Part Number Breakdown Understanding the nomenclature helps identify the specific variant: 1. **FTR-K3:** Series name (High capacity power relay). 2. **JB:** Contact rating/Specific internal design variant. 3. **005:** Coil voltage (005 = 5 Volts DC). 4. **W:** Contact material or sealing type (usually Silver Tin Oxide). 5. **NIL:** Standard version (No special modifications). --- ### 4. Typical Applications Due to its ability to handle up to 16 Amps, this relay is commonly found in: * **HVAC Systems:** Controlling fans and compressors. * **Smart Home Plugs:** Switching high-wattage appliances. * **Industrial Controls:** Powering motors or heaters. * **Power Supplies:** Used as an inrush current protection switch or main power relay. ---