The **JRQ2-7E-R** is a specific model of a **Miniature Intermediate Relay**, commonly used in industrial automation, control panels, and PCB designs. It is designed to act as an electrically operated switch that allows a low-power signal to control a much higher-power circuit. --- ### 1. Key Technical Specifications Based on the standard nomenclature for the JRQ2 series, here are the technical characteristics: | Parameter | Specification Details | | :--- | :--- | | **Component Type** | Electromechanical Relay | | **Mounting Type** | PCB (Printed Circuit Board) through-hole | | **Contact Arrangement** | Typically 2 Form C (DPDT - Double Pole Double Throw) | | **Coil Voltage** | Depending on sub-variant (7V to 12V range common) | | **Contact Rating** | Usually 1A to 3A at 30VDC / 125VAC | | **Termination** | Solder Pins | --- ### 2. Internal Electronic Structure The device consists of four primary internal electronic/mechanical parts: 1. **The Coil:** An internal copper winding that creates a magnetic field when energized. 2. **The Armature:** A moving lever that responds to the magnetic field. 3. **Spring Mechanism:** Returns the armature to its original position when power is removed. 4. **Contacts:** The physical "switch" points made of silver alloy (often gold-plated) to ensure low electrical resistance and prevent oxidation. --- ### 3. Terminal Configuration While you should always verify with a specific datasheet, the "2" in the prefix usually denotes the number of poles. | Pin Number | Function | Description | | :--- | :--- | :--- | | **Coil Pins** | Input | Connects to the control circuit (e.g., a microcontroller via a transistor). | | **COM (Common)** | Pole | The moving part of the switch connected to the load. | | **NC (Normally Closed)** | Default Path | The circuit is closed when the relay is **OFF**. | | **NO (Normally Open)** | Triggered Path | The circuit closes only when the relay is **ON**. | --- ### 4. Application Use Cases * **Signal Switching:** Used in telecommunications and test equipment to route low-level signals. * **Isolation:** Providing galvanic isolation between a low-voltage DC controller and a high-voltage AC load. * **Logic Expansion:** Using one output signal to trigger two separate circuits simultaneously.