The **M2RS-3B-R/BL** is a high-performance, industrial-grade illuminated push-button switch, typically manufactured by companies like **IDEC**. It is part of the M2 series, known for its miniature footprint and reliable switching mechanics. --- ### 1. Technical Specifications The part number can be broken down into specific electronic and mechanical components: | Feature | Specification | Description | | :--- | :--- | :--- | | **Series** | M2 | Miniature series (8mm mounting hole typical) | | **Contact Form** | SPDT / DPDT | Single/Double Pole Double Throw (model dependent) | | **Action Type** | Maintained/Momentary | Likely "Maintained" (stays pushed) or "Momentary" | | **Illumination** | LED | Red/Blue (R/BL) color configuration | | **Terminal Type** | Solder/Tab | Designed for PCB or direct wire soldering | | **Voltage Rating** | 24V DC / 125V AC | Standard rating for control circuits | --- ### 2. Key Electronic Components #### A. The Switching Mechanism Inside the housing is a micro-switch contact block. * **Gold-clad contacts:** These parts often use gold plating to prevent oxidation, ensuring a low-resistance electrical path even at low voltages (logic levels). * **Snap-action:** Provides a tactile "click" feedback and ensures rapid separation of contacts to prevent electrical arcing. #### B. The Illumination Circuit (R/BL) The "R/BL" designation refers to the visual indicators: * **LED Die:** High-efficiency Light Emitting Diodes are embedded behind the lens. * **Current Limiting:** Usually requires an external resistor if not built-in, though many industrial modules are rated for specific voltages (e.g., 24V) with internal regulation. * **Dual Color/Split Lens:** The "R/BL" often signifies a **Red/Blue** color split or a Red LED with a Blue lens/filter, used to distinguish between "Fault" (Red) and "Ready" (Blue) states. #### C. Housing & Protection * **Dielectric Material:** The body is made of high-insulation thermoplastic to prevent leakage current between terminals. * **IP Rating:** Typically rated **IP40** or **IP65** (depending on the specific seal) for protection against dust and moisture. --- ### 3. Pinout Configuration (Standard M2 Style) Most units in this series follow a 5-terminal or 8-terminal layout: 1. **C (Common):** The main input for the switch. 2. **NO (Normally Open):** Connection made only when pressed. 3. **NC (Normally Closed):** Connection broken when pressed. 4. **(+) LED Terminal:** Positive supply for the lamp. 5. **(-) LED Terminal:** Negative/Ground for the lamp. ---