The **FTR-K3JB009W** is a high-performance power relay manufactured by **Fujitsu Components**. It is specifically designed for high-current applications and is commonly found in power supplies, industrial controls, and household appliances. --- ### 1. Key Technical Specifications The following table highlights the primary electrical and physical characteristics of this component: | Feature | Specification | | :--- | :--- | | **Relay Type** | Power Relay (Electromagnetic) | | **Contact Form** | 1 Form A (SPST-NO: Single Pole Single Throw, Normally Open) | | **Coil Voltage** | 9V DC | | **Contact Rating** | 25A @ 250V AC | | **Contact Material** | Silver Tin Oxide ($AgSnO_2$) | | **Mounting Type** | Through Hole (PCB) | | **Insulation** | Reinforced (10mm distance between coil and contacts) | | **Dielectric Strength** | 5,000V AC (between coil and contacts) | --- ### 2. Functional Components To understand the electronic nature of the FTR-K3JB009W, it can be broken down into three main systems: #### A. The Control Side (Coil) * **Nominal Voltage:** 9V DC. This is the voltage required to energize the internal electromagnet. * **Power Consumption:** Typically around 780mW. * **Safety Feature:** The coil is designed with high insulation to prevent high-voltage surges from the load side from damaging the control circuit (Microcontroller/Logic board). #### B. The Switching Side (Contacts) * **High Inrush Current:** These contacts are built to handle massive "inrush" currents (up to 80A for short bursts), making them ideal for motors or capacitive loads. * **$AgSnO_2$ Material:** The use of Silver Tin Oxide prevents the contacts from "welding" together under high heat or electrical arcing. #### C. The Housing (Package) * **Flammability:** Usually rated UL94V-0 (Self-extinguishing). * **Sealing:** Often comes in a flux-tight or plastic-sealed construction to protect internal parts from oxidation or soldering flux. --- ### 3. Pinout Configuration While you should always consult the official datasheet, the standard layout for the FTR-K3JB series is as follows: ```text Top View Diagram (Representative): +-------------------+ | (Coil) (Coil) | | [1] [2] | | | | | | [3] [4] | | (Contact) (Contact)| +-------------------+ ``` --- ### 4. Common Applications * **Solar Inverters:** Switching the AC output. * **HVAC Systems:** Controlling compressors or heavy fans. * **Smart Plugs/Home Automation:** Handling high-wattage appliances (up to 25A). * **Industrial Power Supplies:** Main power switching.