The **FRT-60-R** is an electronic component primarily classified as a **Thermal Cut-off (TCO) fuse** or a **Thermal Protector**. These components are critical safety devices designed to interrupt an electrical circuit when the surrounding temperature exceeds a specific threshold. --- ### 1. Technical Specifications Below are the typical electronic characteristics of the FRT-60-R series: | Parameter | Specification | | :--- | :--- | | **Functioning Temperature ($T_f$)** | $60^\circ\text{C}$ | | **Rated Current ($I_r$)** | Typically 1A to 2A (check specific datasheet for variations) | | **Rated Voltage ($U_r$)** | 250V AC | | **Holding Temperature ($T_h$)** | Approx. $45^\circ\text{C}$ (The temp at which it won't trip) | | **Maximum Temp Limit ($T_m$)** | $200^\circ\text{C}$ (Max temp before physical damage) | | **Terminal Material** | Silver-plated copper or leaded alloy | --- ### 2. Internal Construction and Working Principle The FRT-60-R operates on a non-resettable thermal link mechanism: 1. **Thermal Element:** Inside the casing is a heat-sensitive organic pellet or a low-melting-point alloy. 2. **Spring Mechanism:** A compressed spring is held in place by the solid thermal element. 3. **The Trip:** Once the ambient temperature reaches **$60^\circ\text{C}$**, the thermal element melts. 4. **Circuit Break:** The spring is released, physically pushing the contacts apart and permanently opening the circuit. --- ### 3. Key Features * **Non-Resettable:** Once it trips, the part must be replaced. This ensures that the underlying cause of overheating is investigated before the device is used again. * **Compact Design:** Usually radial or axial leaded, allowing for easy integration into small transformers or motor windings. * **High Sensitivity:** Designed for precision response to temperature changes rather than current spikes (unlike a standard fuse). --- ### 4. Common Applications The FRT-60-R is widely used in low-power electronics where heat management is critical: * **Small Motors:** Protecting fans or kitchen appliances from stalling and overheating. * **Transformers:** Embedded in the primary or secondary windings to prevent fire hazards. * **Battery Packs:** Acting as a final fail-safe during charging cycles. * **LED Drivers:** Protecting sensitive semi-conductors from thermal runaway. --- ### 5. Installation Note > **Warning:** When soldering the FRT-60-R, a heat sink (like a pair of pliers) must be used on the leads. Because the trip temperature is only $60^\circ\text{C}$, the heat from a soldering iron can easily trigger the fuse during installation.