The **4MPB2** is a specific part number typically associated with **Miniature Push Button Switches** (specifically the 4M series). These are common electromechanical components used in signal switching and interface panels. Below is an overview of the electronic specifications, physical characteristics, and typical applications. ### 1. Technical Specifications Most 4MPB2 models adhere to the following standard electrical ratings: | Feature | Description | | :--- | :--- | | **Contact Rating** | Usually 3A @ 120VAC or 1A @ 250VAC | | **Contact Resistance** | 20 mΩ max (initial) | | **Insulation Resistance** | 1,000 MΩ min | | **Dielectric Strength** | 1,000 Vrms at sea level | | **Operating Temperature** | -30°C to +85°C | | **Electrical Life** | 50,000 make-and-break cycles at full load | --- ### 2. Physical Construction The "4M" series often indicates a sub-miniature footprint designed for PCB (Printed Circuit Board) mounting or panel mounting. * **Materials:** * **Case:** Diallyl phthalate (DAP) or High-temp Nylon. * **Plunger:** Thermoplastic Polyester. * **Bushings:** Brass, nickel plated. * **Contacts:** Silver or Gold plated (Gold is preferred for low-power/dry circuits). * **Terminal Type:** Typically features PC terminals or solder lugs. * **Action:** Usually **Momentary** (the switch returns to its original position after being released). --- ### 3. Circuit Configuration The 4MPB2 usually follows a standard SPDT or DPDT configuration: ```mermaid graph LR A[Common Pin] --- B[NC - Normally Closed] A -.-> C[NO - Normally Open] ``` * **OFF-(ON):** This is the most common configuration where the circuit is open until the button is pressed. --- ### 4. Typical Applications Because of their small size and reliability, these parts are found in: 1. **Telecommunications:** Network equipment and reset buttons. 2. **Instrumentation:** Control panels and calibration tools. 3. **Medical Equipment:** Handheld diagnostic devices. 4. **Audio/Visual:** Signal routing and effect pedals. ---