The **F2TS-5E-R** is a specific model of a **Thermal Link** (also known as a thermal cutoff or thermal fuse) manufactured by companies like **UCHIYA**. These components are critical safety devices designed to protect electrical circuits from overheating. --- ## 1. Technical Specifications The F2TS-5E-R belongs to the F-series of thermal protectors. Below are the typical specifications for this part: | Feature | Specification | | :--- | :--- | | **Function Type** | Non-Resettable Thermal Link | | **Rated Operating Temperature ($T_f$)** | Approximately 100°C to 150°C (Varies by sub-batch) | | **Rated Voltage** | 250V AC | | **Rated Current** | 5A | | **Lead Orientation** | Radial (Both leads exit from one side) | | **Safety Certifications** | UL, VDE, CSA, PSE | --- ## 2. Electronic Composition The F2TS-5E-R is composed of several key internal elements that allow it to function as a safety fuse: * **Fusible Alloy:** The heart of the device is a small pellet made of a low-melting-point alloy. * **Insulated Case:** Usually ceramic or heat-resistant plastic, designed to withstand high temperatures without melting. * **Lead Wires:** Typically tin-plated copper leads for easy soldering onto PCBs. * **Epoxy Seal:** Used to protect the internal alloy from oxidation and environmental moisture. --- ## 3. Working Principle The device operates on a "one-shot" principle: 1. **Normal State:** The internal alloy is solid, completing the circuit and allowing current to flow through the 5A rated path. 2. **Overheat Event:** When the ambient temperature reaches the rated $T_f$ (e.g., due to a motor stall or heater failure), the alloy melts. 3. **Circuit Interruption:** Surface tension causes the melted alloy to pull apart, creating a permanent physical gap in the conductor. 4. **Open Circuit:** The power is cut off, preventing a potential fire. **Note:** Once triggered, the part must be replaced; it cannot be reset. --- ## 4. Common Applications The F2TS-5E-R is frequently found in small household appliances and industrial equipment: * **Small Motors:** Hairdryers, fans, and blenders. * **Heating Elements:** Coffee makers, irons, and rice cookers. * **Power Supplies:** Transformers and battery chargers. * **Automotive:** Seat heaters or blower motor resistors. --- ## 5. Circuit Symbol & Identification In a schematic diagram, the F2TS-5E-R is represented as a fuse with a "T" or a temperature symbol: ```text F2TS-5E-R +---------+ ---| [ T ] |--- +---------+ (Thermal Fuse) ```