### Technical Overview: NKK Switches UB201KW035F-3JB The **UB201KW035F-3JB** is a high-quality, illuminated push-button switch manufactured by **NKK Switches**. It belongs to the UB2 series, which is known for its low-profile design and reliable tactile feedback. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Circuitry** | SPDT (Single Pole Double Throw) | | **Switch Function** | ON-(ON) / Momentary (Spring back after press) | | **Current/Voltage Rating** | 5A @ 125/250V AC; 5A @ 30V DC | | **Illumination Type** | LED (Integrated) | | **LED Color** | Green | | **Cap/Diffuser Color** | Clear Lens with White Diffuser | | **Termination Style** | PC Pin (Through-hole mounting) | | **Mechanical Life** | 1,000,000 cycles | --- ### 2. Breakdown of the Part Number The part number provides specific details about the component's construction: * **UB2**: Series designation (Low profile, small footprint). * **01**: Circuit configuration (SPDT). * **KW03**: Terminal type and Silver contacts (standard power). * **5F**: LED specification (5 = LED illuminated; F = Green LED). * **3JB**: Cap assembly (3 = Square Large; JB = Clear lens with White diffuser). --- ### 3. Electronic & Physical Features #### A. Contact Mechanism The switch utilizes silver contacts, making it ideal for power-level switching applications. The **Momentary** action means the circuit is only closed (or diverted) while the button is physically held down. #### B. LED Characteristics The green LED is integrated into the body of the switch. It typically requires a current-limiting resistor if the supply voltage exceeds the LED's forward voltage (usually around 2.1V to 2.5V for green LEDs). #### C. Mounting and Form Factor * **PCB Mount:** Designed for direct soldering onto a printed circuit board. * **Compact Design:** The "Low Profile" nature allows it to be used in tight control panels or handheld devices where space is limited. --- ### 4. Common Applications * **Industrial Controls:** Status indicators and manual overrides. * **Audio/Visual Equipment:** Channel switching and signal routing. * **Medical Devices:** User interfaces requiring high reliability and clear visual feedback. * **Test & Measurement:** Calibration or reset buttons.