## HJR-1A-R Relay Specification Overview The **HJR-1A-R** is a popular subminiature intermediate power relay, commonly manufactured by companies like **Tianbo** or **HKE**. It is designed for PCB mounting and is frequently used in household appliances and industrial control systems. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Contact Form** | 1 Form A (SPST-NO - Normally Open) | | **Contact Material** | Silver Alloy | | **Max Switching Current** | 5A to 10A (Depending on specific variant) | | **Max Switching Voltage** | 250VAC / 30VDC | | **Coil Nominal Voltage** | Typically 3V, 5V, 6V, 9V, 12V, 24V DC | | **Coil Power Consumption** | Approx. 0.20W to 0.45W | | **Insulation Resistance** | 100MΩ Min at 500VDC | | **Dielectric Strength** | 1,000VAC (between open contacts) | --- ### 2. Physical Characteristics and Pinout The HJR-1A-R is housed in a "sugar cube" style plastic casing. * **Sealing:** Usually available in "Sealed Type" or "Flux Tight." * **Dimensions:** Approximately 18.4mm x 10.2mm x 15.3mm. * **Termination:** PCB terminals for direct soldering. --- ### 3. Part Number Breakdown Understanding the suffix is crucial for procurement: * **HJR:** Series Name. * **1A:** Contact Arrangement (1 Form A = Normally Open). * **R:** This often denotes the specific series revision or environmental compliance (RoHS). * **DC12V (Example):** Indicates the required coil voltage to trigger the switch. --- ### 4. Common Applications Due to its small footprint and reliable switching, it is used in: * **Smart Home:** Smart plugs, lighting controllers. * **Appliances:** Air conditioners, microwave ovens, washing machines. * **Industrial:** PLC output modules, small motor control. --- ### 5. Basic Wiring Diagram (Conceptual) ```text [ Coil ] [ Contact ] Pin 1 --- ( ) --- Pin 2 (Control Input) Pin 3 -----------| |----------- Pin 4 (Load Switch) (NO) ```