The **HRS-41-R** is a specific model of a **Miniature Intermediate Power Relay**, typically manufactured by brands like **HKE (Henghui)**. It is widely used in automation, household appliances, and industrial control systems due to its compact size and high switching capacity. --- ## 1. Key Specifications The electronic characteristics of the HRS-41-R define its performance limits. Below is a summary of its general technical parameters: | Parameter | Specification (Typical) | | :--- | :--- | | **Contact Form** | 1 Form C (SPDT) or 1 Form A (SPST-NO) | | **Contact Material** | AgSnO₂ (Silver Tin Oxide) or AgCdO | | **Max Switching Current** | 3A to 10A (Depending on specific sub-model) | | **Max Switching Voltage** | 250VAC / 30VDC | | **Coil Voltage (DC)** | 3V, 5V, 6V, 9V, 12V, 24V, 48V | | **Coil Power Consumption** | Approx. 200mW to 450mW | | **Dielectric Strength** | 1,000VAC (between open contacts) | --- ## 2. Internal Components and Construction The HRS-41-R consists of several critical electronic and mechanical parts: ### A. The Electromagnetic Coil * **Function:** When DC current flows through this copper wire winding, it creates a magnetic field. * **Role:** This field pulls the armature to toggle the contacts. ### B. The Contacts (Switching Element) * **Stationary Contact:** Fixed to the frame. * **Movable Contact:** Attached to the armature. * **Material:** Often coated with Silver Tin Oxide to prevent "welding" or oxidation during high-current switching. ### C. The Armature and Spring * The **Armature** is the moving metal piece attracted by the coil. * The **Spring** ensures the contacts return to their "Normal" position once power is removed from the coil. --- ## 3. Terminal Layout (Pinout) The "R" in the suffix often denotes a specific pin orientation or RoHS compliance. A standard 5-pin configuration usually follows this logic: | Pin Number | Description | | :--- | :--- | | **1 & 2** | **Coil Terminals:** Where the input control voltage is applied. | | **3** | **Common (COM):** The main terminal connected to the movable contact. | | **4** | **Normally Closed (NC):** Connected to COM when the coil is OFF. | | **5** | **Normally Open (NO):** Connected to COM when the coil is ON. | --- ## 4. Typical Application Circuit When driving an HRS-41-R with a microcontroller (like an Arduino), a flyback diode is required to protect the electronics from voltage spikes. ```cpp // Schematic Concept [MCU Pin] ---> [Resistor] ---> [Transistor Base] | [Relay Coil] <--- [Flyback Diode in Parallel] | [GND] ``` ---