The **M2TT-74-R/BL** is a specific type of miniature toggle switch manufactured by **NKK Switches**. It belongs to the **M series**, which is known for its high reliability and diverse mounting options. Below is a detailed breakdown of its electronic and mechanical specifications. --- ### 1. General Specifications | Feature | Description | | :--- | :--- | | **Manufacturer** | NKK Switches | | **Series** | M Series (Miniature Toggles) | | **Circuit Configuration** | DPDT (Double Pole Double Throw) | | **Switch Function** | ON-OFF-ON (Three-position) | | **Mounting Type** | Through-hole, Right Angle (Horizontal Mount) | --- ### 2. Electrical Characteristics This part is designed for low-to-medium power signal switching. * **Contact Rating:** * 6A @ 125V AC * 3A @ 250V AC * 4A @ 30V DC * **Contact Resistance:** 10 milliohms maximum. * **Insulation Resistance:** 1,000 Megohms minimum @ 500V DC. * **Dielectric Strength:** 1,000V AC minimum between contacts for at least one minute. * **Electrical Life:** 25,000 operations minimum (at full load). --- ### 3. Physical & Mechanical Attributes The "R/BL" suffix typically denotes specific hardware or aesthetic features, such as the actuator color or bracket style. * **Actuator Type:** Standard Bat Toggle. * **Terminal Style:** PC Terminals (Printed Circuit). * **Orientation:** The "74" in the part number indicates a **Right Angle** orientation with a bracket, allowing the switch to be mounted flat on a PCB while the toggle protrudes from the side of the enclosure. * **Operating Temperature:** -30°C to +85°C (-22°F to +185°F). --- ### 4. Part Number Breakdown To understand the specific electronics of this component, we can deconstruct the code: | Segment | Meaning | | :--- | :--- | | **M2** | Miniature Toggles (Series) | | **T** | Toggle Actuator | | **T** | Threaded or Plain Bushing (usually standard) | | **74** | DPDT Circuit / Right Angle PC Mount / 3-Position (ON-OFF-ON) | | **R** | Right Angle variant | | **BL** | Blue Cap/Actuator or specific plating (color coding) | --- ### 5. Application Usage Because of its **DPDT ON-OFF-ON** configuration, this switch is commonly used for: * **Polarity Reversal:** Controlling the direction of small DC motors. * **Mode Selection:** Switching between two different input sources with a center "Neutral/Off" position. * **Audio Equipment:** Routing signals between different processing paths. ---