The **M2REB-SAD-R** is a specific part number typically associated with the **M2 Series** of miniature tactile or pushbutton switches, often manufactured by companies like **NKK Switches**. Below is a detailed breakdown of the electronic components, specifications, and nomenclature associated with this part. --- ### 1. Component Overview The M2REB-SAD-R is a **Miniature Pushbutton Switch** designed for PCB (Printed Circuit Board) mounting. It belongs to a series known for its reliability, tactile feedback, and compact footprint. ### 2. Part Number Breakdown (Nomenclature) While exact prefixes can vary by manufacturer, the standard breakdown for this series is as follows: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **M2** | Series Series | Miniature Pushbutton Series | | **REB** | Switch Action | Momentary action (On-Mom) | | **SAD** | Terminal/Mounting | Straight PC terminals with bracket | | **-R** | Contact Material | Gold contacts (Logic Level) | --- ### 3. Key Electronic Specifications These switches are primarily used for low-power signal switching. * **Contact Rating:** Typically **0.4VA maximum @ 28V AC/DC maximum**. This indicates it is a "Logic Level" switch, not intended for high-power mains. * **Contact Resistance:** Generally less than **50 milliohms**. * **Insulation Resistance:** 1,000 Megohms minimum @ 500V DC. * **Dielectric Strength:** 1,000V AC minimum between contacts for at least one minute. * **Mechanical Life:** Often rated for **200,000 cycles** or more. * **Operating Temperature:** Range typically spans from **-30°C to +85°C**. --- ### 4. Physical & Material Composition The "parts" inside the switch consist of high-quality materials to ensure longevity: 1. **Plunger/Actuator:** Usually made of Polyamide or Polyacetal. 2. **Housing/Case:** Glass fiber reinforced Polyamide (high heat resistance for soldering). 3. **Movable Contacts:** Phosphor bronze with gold plating. 4. **Terminals:** Brass with gold over nickel plating. The **"SAD"** designation specifically refers to the layout of the pins and the support bracket that provides mechanical stability when pushed. --- ### 5. Common Applications * **Telecommunications:** Network equipment reset buttons. * **Industrial Controls:** Parameter adjustment on PLCs. * **Medical Equipment:** Interface controls for handheld devices. * **Computing:** Peripheral input and internal configuration switches.