The **G2R-1** (specifically from Omron’s G2R series) is one of the most widely used general-purpose power relays in the electronics industry. It is a **Power PCB Relay** designed for high-capacity switching and reliability. --- ### 1. Technical Specifications Below are the primary electronic characteristics of the standard G2R-1 model: | Parameter | Specification | | :--- | :--- | | **Contact Form** | SPDT (1 Form C) or SPST-NO (1 Form A) | | **Switching Capacity** | 10A at 250 VAC / 30 VDC | | **Maximum Switching Voltage** | 380 VAC, 125 VDC | | **Coil Power Consumption** | Approx. 530 mW | | **Dielectric Strength** | 5,000 VAC (between coil and contacts) | | **Insulation Resistance** | 1,000 MΩ min. | --- ### 2. Internal Components and Functionality The relay consists of several key electronic and mechanical sub-parts: 1. **The Coil (Electromagnet):** Copper wire wound around a core. When energized with DC voltage (commonly 5V, 12V, or 24V), it creates a magnetic field. 2. **The Armature:** A moving metal piece that is attracted to the coil when it is energized. 3. **The Contacts:** * **Common (COM):** The moving terminal. * **Normally Closed (NC):** Connected to COM when the coil is OFF. * **Normally Open (NO):** Connects to COM when the coil is ON. 4. **Spring Mechanism:** Ensures the armature returns to its original position when power is removed. --- ### 3. Pinout Configuration The "1" in G2R-1 indicates it is a **1-pole** relay. Looking at the bottom (solder side), the pins are typically arranged as follows: ```text [ Coil ] (1) (2) [ Coil ] | | | | [ COM ] (3) (4) [ NC ] (5) [ NO ] ``` *(Note: Actual physical pin spacing follows a 5mm pitch standard for PCB mounting.)* --- ### 4. Part Numbering Breakdown Understanding the suffixes helps identify specific electronic variations: * **G2R-1:** Standard SPDT (Single Pole Double Throw). * **G2R-1A:** SPST-NO (Single Pole Single Throw, Normally Open). * **G2R-1-E:** High-capacity model (switches up to 16A). * **G2R-1-S:** Plug-in terminal type with a mechanical indicator and nameplate. --- ### 5. Common Applications * **Home Appliances:** Control for heaters, motors, and fans in washing machines or refrigerators. * **Industrial Controls:** Used in PLC (Programmable Logic Controller) outputs. * **HVAC Systems:** Switching compressors or boilers. * **Power Supplies:** Isolation and circuit protection.