The term **S-R3** generally refers to a specific type of **Single-Pole, Single-Throw (SPST) rocker switch** commonly used in small appliances, power strips, and consumer electronics. These parts are standardized electromechanical components designed for power control. ### 1. Technical Specifications Typical S-R3 series switches are designed for AC power handling. Below are the common technical parameters: | Parameter | Typical Value | | :--- | :--- | | **Circuit Type** | SPST (Single Pole, Single Throw) | | **Current Rating** | 6A to 10A @ 250V AC / 15A @ 125V AC | | **Contact Resistance** | ≤ 50mΩ | | **Insulation Resistance** | ≥ 100MΩ | | **Dielectric Strength** | 1500V AC/min | | **Mechanical Life** | > 10,000 Cycles | --- ### 2. Physical Construction The S-R3 component consists of four primary internal and external sections: 1. **The Actuator (Rocker):** The plastic part that moves back and forth to toggle the state. Often marked with "I" and "O" for On/Off. 2. **The Housing:** Usually made of heat-resistant Nylon 66 (UL 94V-2 flame rating). 3. **The Terminals:** Silver-plated copper or brass. S-R3 models usually feature 2 or 3 pins (3-pin versions include an internal lamp). 4. **The Contacts:** Moving copper bridges that complete or break the circuit. --- ### 3. Connection Pinout Depending on the specific sub-model (Illuminated vs. Non-illuminated), the wiring differs: * **2-Pin Model:** Functions as a simple "break" in the wire. One pin is the Line In, the other is Line Out. * **3-Pin Model (Illuminated):** * **Pin 1:** Power In (Line). * **Pin 2:** Power Out (Load). * **Pin 3:** Neutral (Required only to power the internal Neon or LED bulb). --- ### 4. Implementation Example In a basic circuit, the S-R3 acts as the gatekeeper for the high-voltage side of the power supply. ```arduino // Logical representation of an S-R3 in a DC circuit (concept only) if (Switch_State == HIGH) { // Current flows through the S-R3 contacts Output_Power = TRUE; } else { // Air gap between contacts prevents flow Output_Power = FALSE; } ``` ---