The **FTR-K3JB012W** is a specific type of power relay manufactured by Fujitsu (formerly Takamisawa). It is widely used in home appliances and industrial equipment due to its high breaking capacity and compact design. --- ### 1. Technical Specifications The following table summarizes the key electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Relay Type** | Power Relay (Electromechanical) | | **Contact Form** | 1 Form A (SPST-NO: Single Pole Single Throw - Normally Open) | | **Nominal Coil Voltage** | 12V DC | | **Switching Current (Max)** | 25A | | **Switching Voltage (Max)** | 250V AC | | **Coil Power Consumption** | Approx. 780 mW | | **Contact Material** | Silver Tin Oxide (AgSnO2) | | **Mounting Type** | Through-Hole (PCB) | --- ### 2. Breakdown of the Model Number Understanding the nomenclature helps in identifying the specific variant: * **FTR-K3**: Series designation (High power, 25A class). * **J**: Contact material/rating (indicates high capacity). * **B**: Package type/Sealing (Flux free or Plastic sealed). * **012**: Coil Voltage (12V DC). * **W**: High temperature/Standard specific variant. --- ### 3. Key Electronic Features * **High Inrush Current:** Designed to handle high initial surges, making it ideal for motor starting or inductive loads. * **Insulation:** Offers high insulation distance (Creepage and Clearance) between the coil and contacts, typically meeting 8mm standards for safety. * **Cadmium-Free:** The contacts are made of AgSnO2, which is environmentally friendly and compliant with RoHS standards. * **Compact Footprint:** Despite its 25A rating, it is designed for PCB mounting with a relatively small footprint compared to industrial contactors. --- ### 4. Typical Applications The FTR-K3JB012W is commonly found in: 1. **Air Conditioners:** Controlling compressors and fan motors. 2. **Water Heaters:** Switching high-wattage heating elements. 3. **Smart Plugs/Power Strips:** For high-load industrial power management. 4. **Microwave Ovens:** Controlling the magnetron power supply. ---