The **2104-E-R** typically refers to a high-performance **Subminiature Pushbutton Switch** often manufactured by companies like **OTTO Engineering** or similar industrial component suppliers. These parts are designed for rugged environments where precision and reliability are critical. --- ### 1. Technical Specifications The following table outlines the general electronic and mechanical characteristics typical of this component series: | Parameter | Specification (Typical) | | :--- | :--- | | **Switch Type** | Momentary Pushbutton | | **Circuitry** | SPST (Single Pole, Single Throw) or SPDT | | **Current Rating** | 2A to 5A (depending on voltage) | | **Voltage Rating** | 28V DC / 115V AC | | **Contact Resistance** | < 25 mΩ | | **Operating Force** | 2.5 lbs. to 4.0 lbs. | | **Operating Temp** | -55°C to +85°C | --- ### 2. Key Internal Components The "Electronic Parts" within the 2104-E-R assembly consist of: 1. **Contacts:** Usually made of silver alloy or gold-plated brass to ensure low resistance and prevent oxidation. 2. **Spring Mechanism:** A precision-engineered snap-action spring that provides tactile feedback and ensures the circuit breaks or connects instantly. 3. **Housing/Bushing:** Often made of anodized aluminum or stainless steel to provide EMI/RFI shielding and physical protection. 4. **Terminals:** Solder turret or PC pin style, designed for secure electrical connection to a PCB or wiring harness. --- ### 3. Features and Applications * **Sealing:** These units are often "dust-tight" or "moisture-resistant" (IP64 to IP68 standards), making them ideal for outdoor or industrial use. * **Reliability:** Tested for hundreds of thousands of cycles. * **Common Use Cases:** * Avionics and Cockpit controls. * Heavy industrial machinery. * Military-grade communication devices. * Medical diagnostic equipment. --- ### 4. Part Number Breakdown While specific to the manufacturer, the suffix **"-R"** often denotes a specific compliance or physical attribute: * **RoHS Compliance:** Ensuring the electronic parts are lead-free. * **Red Button:** Indicating a specific color code for emergency or stop functions. * **Reverse Action:** Referring to the logic of the contact (Normally Closed vs Normally Open). ---