The term **602-3** most commonly refers to a specific sub-series of high-precision **NTC (Negative Temperature Coefficient) Thermistors** or specialized **Electromechanical Relays**. In the context of electronic parts, these are standard components used for sensing and switching. Below is a breakdown of the most common electronic parts associated with the "602-3" designation. --- ### 1. NTC Thermistor (Series 602-3) The 602-3 is a high-accuracy, interchangeable thermistor often used in medical and industrial applications where precision temperature monitoring is required. | Feature | Specification (Typical) | | :--- | :--- | | **Component Type** | Resistance Temperature Detector | | **Nominal Resistance** | 30,000 Ohms (30kΩ) at 25°C | | **Tolerance** | ±0.1°C or ±0.2°C (High Precision) | | **Encapsulation** | Epoxy coated or Glass encapsulated | | **Applications** | Medical probes, Lab equipment, HVAC controls | --- ### 2. Electromechanical Relays (Suffix 602-3) In some industrial catalogs (such as those from Struthers-Dunn or Teledyne), "602-3" refers to a specific coil voltage or mounting style for a subminiature relay. * **Function:** Uses a low-power signal to control a high-power circuit. * **Voltage:** Often indicates a **3V DC** or **3.3V DC** coil rating. * **Contact Arrangement:** Usually DPDT (Double Pole Double Throw). --- ### 3. Connection and Wiring Standard (DIN 602-3) Occasionally, "602" refers to German (DIN) or international standards for electrical connectors. * **602-3 Pins:** Refers to a 3-pin configuration in a circular or industrial connector. * **Usage:** Power supply cables for small motors or specialized sensor interfaces. --- ### Key Technical Considerations If you are replacing a 602-3 part in a circuit, verify these three factors: 1. **Impedance/Resistance:** For thermistors, ensure the Base Resistance at 25°C matches exactly. 2. **Form Factor:** Check if it is a "Leaded" component (with wires) or an "SMD" (Surface Mount Device). 3. **Thermal Curve:** Ensure the "Beta Value" (the rate at which resistance changes with temperature) matches the original part.