The **RG3-112S-R15** is a specific model of an **Electromagnetic Relay**, typically categorized as a miniature power relay used in various industrial and consumer electronics for switching high-current loads with a low-power control signal. --- ### 1. Key Technical Specifications Based on the standard nomenclature for this series, here are the core electronic characteristics: | Parameter | Specification | | :--- | :--- | | **Contact Form** | SPDT (1 Form C) - Single Pole Double Throw | | **Coil Voltage** | 12V DC | | **Contact Rating** | Typically 10A to 15A at 250VAC/30VDC | | **Coil Power** | Approx. 360mW to 450mW | | **Terminal Type** | PCB Mounting (Through-hole) | | **Contact Material** | Silver Alloy (AgSnO2 or AgNi) | --- ### 2. Breakdown of the Model Number The part number can be decoded to understand its internal construction: * **RG3**: The series designation (Miniature Power Relay). * **1**: Number of poles (1 Pole). * **12**: Rated Coil Voltage (12V DC). * **S**: Sealing type (Usually indicates "Sealed" or "Wash Tight"). * **R15**: Specific Revision or High Capacity identifier (often denotes 15A switching capability). --- ### 3. Internal Components & Operation The device consists of four primary electronic/mechanical parts: 1. **The Coil:** A copper wire winding around an iron core. When 12V DC is applied, it creates an electromagnetic field. 2. **The Armature:** A moving lever attracted by the coil's magnetic field. 3. **The Contacts:** * **Normally Closed (NC):** Touches the common pin when the coil is OFF. * **Normally Open (NO):** Touches the common pin when the coil is ON. 4. **The Spring:** Returns the armature to the original position once power is removed from the coil. --- ### 4. Common Applications * **Home Appliances:** Control boards for air conditioners, heaters, and microwave ovens. * **Automotive:** Power windows, central locking, or lighting control. * **Industrial Automation:** PLC output modules and motor control. * **Power Supplies:** Used in Uninterruptible Power Supplies (UPS) for switching between mains and battery. ---