The **M2REB-R22-R2** is a specific model within the **M2 series** of industrial rotary switches, typically manufactured by companies like **NKK Switches**. These components are designed for high-reliability circuit switching in logic-level applications. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electronic and physical characteristics: | Feature | Specification | Description | |:---|:---|:---| | **Series** | M2 | Subminiature Rotary Series | | **Circuit** | REB | Round actuator, PC terminals, Non-shorting | | **Contact Material** | R | Gold-plated (Logic Level) | | **Terminal Type** | 22 | Right-angle Mount (Horizontal) | | **Positions** | R2 | 2-Position (Binary or On-On type) | --- ### 2. Key Electronic Components & Materials #### A. Contact Mechanism * **Gold Plating:** The "R" in the part number signifies gold contacts. Gold is used because it does not oxidize, ensuring a stable connection for **low-voltage (logic level)** circuits where there isn't enough energy to "burn off" oxidation (unlike silver contacts). * **Non-Shorting (Break-Before-Make):** The internal mechanism ensures that the first connection is broken before the second connection is established. This prevents temporary short circuits during switching. #### B. Electrical Ratings * **Voltage/Current:** Typically rated for **0.4VA maximum at 28V AC/DC**. * **Insulation Resistance:** Usually 1,000 Megohms minimum at 500V DC. * **Dielectric Strength:** 1,000V AC minimum between contacts for at least one minute. #### C. Physical Construction * **Terminals:** The "22" suffix indicates **Right-Angle PC terminals**. This allows the switch to be mounted flat on a Printed Circuit Board (PCB) while the knob protrudes from the side of the device casing. * **Sealing:** These units often feature an automated soldering-friendly design with internal O-rings to prevent flux contamination during the manufacturing process. --- ### 3. Common Applications Due to its subminiature size and gold contacts, this part is used in: 1. **Handheld Devices:** For mode selection or power switching. 2. **Telecommunications:** Signal routing in rack-mounted equipment. 3. **Medical Electronics:** Precision setting adjustments where high reliability is critical. 4. **Test Equipment:** Switching between measurement ranges. ---