The **JRQ2-7B-R** is a specific model of a **Miniature Intermediate Power Relay**, typically used in industrial automation, PCB design, and control circuits. Below is a detailed breakdown of its electronic parts and specifications. ### 1. Component Overview This component is an electromechanical relay designed to allow a low-power signal to control a much higher-power circuit. The "7B" suffix usually denotes the contact arrangement, while "R" often signifies a specific mounting or environmental protection rating. --- ### 2. Internal Electronic Parts The relay consists of four primary internal assemblies: | Part Name | Function | Material/Composition | | :--- | :--- | :--- | | **Electromagnetic Coil** | Converts electrical energy into a magnetic field. | Copper winding around a soft iron core. | | **Armature** | A hinged lever that moves when the coil is energized. | Ferromagnetic metal. | | **Spring System** | Returns the armature to the default position when power is cut. | High-tension steel or phosphor bronze. | | **Contacts** | The conductive points that open or close the circuit. | Silver Alloy (AgNi or AgSnO2) for arc resistance. | --- ### 3. Technical Specifications While exact values can vary by manufacturer (often produced by brands like *Jintian* or *Sanyou*), the standard parameters for the JRQ2-7B-R series are: #### A. Coil Parameters * **Rated Voltage:** Usually available in **12VDC** or **24VDC**. * **Power Consumption:** Typically low, around **0.2W to 0.45W** (Sensitive vs. Standard). #### B. Contact Parameters * **Contact Form:** **1C (SPDT)** or **1A (SPST-NO)**. * **Switching Capacity:** Generally rated at **7A to 10A** at 250VAC/30VDC. * **Contact Resistance:** $\le 100m\Omega$ (initial). #### C. Performance Features * **Dielectric Strength:** Usually 1000VAC between open contacts; 5000VAC between coil and contacts. * **Insulation Resistance:** $1000M\Omega$ Min (at 500VDC). * **Mechanical Life:** $1 \times 10^7$ operations. --- ### 4. Typical Applications The JRQ2-7B-R is found in the following electronic environments: 1. **Home Appliances:** Control boards for air conditioners and microwave ovens. 2. **PLCs:** Output modules for programmable logic controllers. 3. **Security Systems:** Triggering alarms or door locks. 4. **Automotive Electronics:** Controlling small peripheral motors or lighting. --- ### 5. Pinout Configuration A standard JRQ2 series relay usually follows a **5-pin layout** (for SPDT): * **2 Pins:** Coil terminals. * **1 Pin:** Common (COM). * **1 Pin:** Normally Open (NO). * **1 Pin:** Normally Closed (NC).