The **RS-121-R** typically refers to a high-current, single-pole rocker switch commonly used in power supplies, household appliances, and industrial equipment. Below is a breakdown of its electronic specifications and characteristics. ### 1. Technical Specifications The "RS" series is a standard form factor for rocker switches. The following table highlights the typical electronic parameters for the RS-121-R model: | Parameter | Typical Value | | :--- | :--- | | **Switching Type** | SPST (Single Pole, Single Throw) | | **Circuit Function** | ON - OFF | | **Current Rating** | 16A @ 125VAC / 10A @ 250VAC | | **Contact Resistance** | ≤ 50mΩ (Initial) | | **Insulation Resistance** | ≥ 100MΩ @ 500VDC | | **Dielectric Strength** | 1500VAC for 1 minute | | **Electrical Life** | ≥ 10,000 Cycles | --- ### 2. Physical Design & Pinout The RS-121-R is designed for panel mounting and usually features a snap-in mechanism. * **Actuator:** "R" often signifies a **Red** actuator or a **Rectangular** body style depending on the specific manufacturer (e.g., Canal, Daier). * **Terminals:** It generally features 2 or 3 terminals. * **2 Terminals:** Standard ON/OFF functionality. * **3 Terminals:** Indicates an **illuminated** version (the third terminal is the neutral connection for the internal neon or LED lamp). * **Mounting Hole:** Usually requires a cutout of approximately $19.2mm \times 13.0mm$ or $21.0mm \times 15.0mm$. --- ### 3. Internal Components Inside the plastic housing, the switch operates using a simple mechanical bridge: 1. **Cradle/Rocker:** The external plastic part the user presses. 2. **Contact Spring:** Provides the "click" feel and ensures the contact stays in place. 3. **Silver-Plated Contacts:** Used to minimize electrical resistance and prevent oxidation during high-current switching. 4. **Neon Lamp (Optional):** If the switch is illuminated, a small gas-discharge lamp and a resistor are wired in parallel with the load. --- ### 4. Connection Diagram For the 3-pin illuminated version, the wiring is typically as follows: ```text Pin 1 (Line): Incoming Hot/Live wire Pin 2 (Load): Outgoing wire to the device Pin 3 (Neutral): Connection to Neutral (only to power the internal light) ``` ---