The **FS-2B-R** is a specific model of a **Foot Switch** (often manufactured by companies like Altech or specialized industrial control brands). It is a medium-to-heavy duty electronic component used to control circuits hands-free. Below is the technical breakdown of its electronic and mechanical parts. ### 1. Key Technical Specifications | Feature | Description | | :--- | :--- | | **Contact Configuration** | SPDT (Single Pole Double Throw) | | **Current Rating** | Typically 10A to 15A at 125/250V AC | | **Action Type** | Momentary (Press to turn on, release to turn off) | | **Housing Material** | Zinc Die Cast or Reinforced Plastic (Model dependent) | | **Color Coding** | "R" usually signifies a **Red** pedal or housing | | **Protection Rating** | Usually IP20 or IP65 (depending on the seal quality) | --- ### 2. Internal Electronic Components The FS-2B-R consists of several critical internal parts that facilitate electrical switching: #### A. Micro Switch (The Heart) Inside the housing is a high-quality snap-action micro switch. * **Terminals:** It features three terminals: **COM** (Common), **NO** (Normally Open), and **NC** (Normally Closed). * **Function:** When the pedal is pressed, a physical lever depresses the micro switch button, flipping the electrical state. #### B. Wiring Terminals * **Screw Terminals:** Used to secure the incoming electrical cord. * **Strain Relief:** A plastic or rubber grommet at the cable entry point to prevent the wires from being pulled out of the internal switch during movement. #### C. Internal Spring Mechanism * While mechanical, the **Return Spring** is essential for the electronic operation. It ensures that the circuit breaks (returns to the "off" position) the moment foot pressure is removed. --- ### 3. Wiring Logic (SPDT) Because the FS-2B-R uses an SPDT configuration, it can be wired in two different ways: 1. **Normally Open (NO):** The device stays OFF until you step on the pedal. (Most common for power tools and sewing machines). 2. **Normally Closed (NC):** The device stays ON and turns OFF only when the pedal is pressed. (Common for safety "stop" or "interruption" circuits). --- ### 4. Typical Applications * **Industrial Machinery:** Controlling drill presses or lathes. * **Medical Equipment:** Actuating imaging devices or surgical tools. * **Office Equipment:** Dictation machines or power staplers. ---