The **HRS-4F-R** is a specific type of **Subminiature Intermediate Power Relay** commonly used in PCB (Printed Circuit Board) applications. It is designed to act as an electrically operated switch, allowing a low-power signal to control a much higher power circuit. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and physical characteristics of the HRS-4F-R relay: | Feature | Specification | | :--- | :--- | | **Contact Form** | 1 Form C (SPDT - Single Pole Double Throw) | | **Max Switching Current** | 10A to 15A (Depending on voltage/load type) | | **Max Switching Voltage** | 250VAC / 30VDC | | **Coil Voltage (Nominal)** | Usually 5V, 12V, or 24V DC (indicated by suffix) | | **Coil Power Consumption** | Approx. 360mW to 450mW | | **Terminal Type** | PCB Through-hole pins | | **Dielectric Strength** | 1,500VAC (between coil and contacts) | --- ### 2. Internal Components and Construction The HRS-4F-R consists of four main electronic/mechanical parts: 1. **The Coil:** A copper wire winding around an iron core. When current flows, it creates a magnetic field. 2. **The Armature:** A moving metal piece that is pulled by the magnetic field toward the coil. 3. **The Contacts:** * **Common (COM):** The moving terminal. * **Normally Closed (NC):** The terminal connected to COM when the relay is "off". * **Normally Open (NO):** The terminal connected to COM when the relay is "on". 4. **The Spring:** Returns the armature to its original position once the coil is de-energized. --- ### 3. Part Number Breakdown (Nomenclature) Typically, the "HRS" series follows a specific naming convention: * **HRS:** Series Name (Miniature Power Relay). * **4:** Contact Rating/Series Variation. * **F:** Insulation System (Class F, which handles higher temperatures up to 155°C). * **R:** Specific designator for RoHS compliance or specific structural sealing (Wash Tight). --- ### 4. Applications The HRS-4F-R is frequently found in: * **Home Appliances:** Microwave ovens, air conditioners, and washing machines. * **Industrial Controls:** PLC output modules and motor control. * **Automotive Electronics:** Power windows or light control. * **Office Equipment:** Photocopiers and printers. --- ### 5. Circuit Symbol (Standard) ```text [ Coil ] [ Contacts ] _|_ / | | / (NO) (+) | L | (-) (COM)O---. |___| \ \ (NC) ```