The **KEPAU-112PC-R** is a specific model of a **Miniature Intermediate Power Relay**, typically manufactured by companies like **Goodsky** (a subsidiary of ECE). It is widely used in automotive electronics, industrial control systems, and household appliances. --- ### 1. Technical Specifications The following table outlines the primary electrical and mechanical characteristics of the KEPAU-112PC-R: | Feature | Specification | | :--- | :--- | | **Coil Voltage** | 12V DC | | **Contact Form** | 1 Form C (SPDT - Single Pole Double Throw) | | **Contact Rating (Resistive)** | 15A @ 125VAC / 10A @ 250VAC / 15A @ 28VDC | | **Max Switching Voltage** | 250VAC / 30VDC | | **Coil Power Consumption** | Approx. 360mW to 450mW | | **Terminal Type** | PCB Mounting (Through-hole) | | **Construction** | Plastic Sealed (Washable) | --- ### 2. Breakdown of the Model Nomenclature The part number can be broken down to understand its specific configuration: * **KEPAU**: The series name (High-power miniature relay). * **1**: Number of poles (1 Pole). * **12**: Rated coil voltage (12 Volts). * **P**: Package type (usually indicating PCB terminals). * **C**: Contact arrangement (Form C / Change-over). * **R**: Environmental protection rating (Flux-tight or Sealed). --- ### 3. Key Electronic Components & Internal Mechanics Inside the KEPAU-112PC-R, several critical parts work together to perform the switching action: 1. **Electromagnetic Coil**: A copper wire winding that generates a magnetic field when 12V DC is applied. 2. **Armature**: A moving iron component that is pulled by the magnetic field of the coil. 3. **Spring Mechanism**: Returns the armature to its original position once the power to the coil is removed. 4. **Contacts (AgSnO2 or AgNi)**: High-quality silver alloy points that physically open or close the electrical circuit. Silver Tin Oxide (AgSnO2) is often used for better resistance to "welding" during high-current surges. 5. **Yoke/Core**: Provides a low-reluctance path for the magnetic flux. --- ### 4. Common Applications Due to its high switching capacity and small footprint, this relay is commonly found in: * **Automotive:** Central locking systems, power windows, and light control. * **Appliances:** Air conditioners, microwave ovens, and washing machines. * **Industrial:** PLC output modules and small motor controllers.