The **M2TT-8B-R** is a specific model of a miniature toggle switch, typically manufactured by **NKK Switches**. It is part of the M2 series, designed for process-sealed applications and PC board mounting. ### 1. Component Specifications The following table outlines the key electrical and physical characteristics of the M2TT-8B-R: | Feature | Specification | | :--- | :--- | | **Switch Configuration** | DPDT (Double Pole Double Throw) | | **Switch Function** | ON-ON | | **Current Rating (AC/DC)** | 0.4VA Max @ 28V AC/DC Max | | **Mounting Type** | Through Hole, Right Angle | | **Termination Style** | PC Pin | | **Actuator Type** | Bat Lever / Standard | | **Environmental Protection** | Process Sealed (Washable) | --- ### 2. Key Electronic Parts & Materials The internal and external construction of the switch involves several critical components: * **Contacts & Terminals:** Usually gold-plated over nickel or silver. The gold plating ensures high reliability for "dry circuits" (low energy applications) by preventing oxidation. * **Housing/Base:** Made from Glass-Fiber Reinforced Polyamide (or similar high-temperature thermoset plastic). This allows the part to withstand wave soldering temperatures. * **Internal Mechanism:** Features a "Double-Action" or "Bifurcated" contact mechanism in many M2 series models, which ensures a stable connection even under vibration. * **Sealing:** Includes an O-ring at the actuator base and an epoxy seal at the terminal base to prevent flux or cleaning solvents from entering the switch during PCB processing. --- ### 3. Pinout & Circuitry As a **DPDT** switch with an **ON-ON** function, it has 6 terminals. ```text Terminal Layout (Bottom View): [1] [4] <-- Pole A / Pole B [2] [5] <-- Common A / Common B [3] [6] <-- Pole A / Pole B ``` * **Position 1:** Terminals 2-1 and 5-4 are connected. * **Position 2:** Terminals 2-3 and 5-6 are connected. --- ### 4. Applications Due to its low-power rating (0.4VA) and right-angle mounting, this part is commonly used in: * Handheld medical devices. * Telecommunications testing equipment. * Industrial control panels requiring high-density PCB layouts.