The **KTS-1A-R** is a specific model of a **Thermal Protector** (often referred to as a Bi-metal Thermostat or Thermal Switch) commonly used in small household appliances and industrial equipment to prevent overheating. --- ### 1. Key Technical Specifications Below are the typical electrical and mechanical parameters for the KTS-1A-R series: | Parameter | Specification | | :--- | :--- | | **Contact Type** | Normally Closed (NC) - Opens on temperature rise | | **Rated Voltage** | 125V AC / 250V AC | | **Rated Current** | 5A to 10A (Depending on specific sub-variant) | | **Operating Temp Range** | 50°C to 150°C (Fixed set point) | | **Tolerance** | ±5°C or ±10°C | | **Reset Type** | Automatic Reset (Closes again once cooled) | | **Lead Wire** | UL-certified heat resistant wires (usually Black/White) | --- ### 2. Internal Components & Materials The KTS-1A-R is composed of several critical electronic and mechanical parts: * **Bi-metallic Disc:** The heart of the device. It consists of two bonded metals with different thermal expansion coefficients. At a specific temperature, the disc snaps to a concave shape, breaking the circuit. * **Stationary & Movable Contacts:** Usually silver-alloy plated to ensure high conductivity and to prevent "pitting" or welding during high-amperage switching. * **Case (Housing):** Typically made of **PBT (Polybutylene Terephthalate)** or ceramic, providing high electrical insulation and thermal resistance. * **Epoxy Seal:** The "R" in the suffix often denotes a sealed or ruggedized design where epoxy resin protects the internal components from moisture and dust. --- ### 3. Functional Operation The KTS-1A-R operates on a simple **Snap-Action** principle: 1. **Normal State:** The bi-metal disc is flat, and the contacts are touching. Current flows through the device to the motor or heater. 2. **Overheat State:** As the ambient temperature reaches the "Action Temperature," the disc snaps. This physically pushes the movable contact away from the stationary contact. 3. **Circuit Interruption:** The electrical path is broken, turning off the appliance to prevent fire or motor burnout. 4. **Reset:** Once the temperature drops below the "Reset Temperature," the disc snaps back to its original shape, reconnecting the circuit. --- ### 4. Common Applications Due to its compact size and reliability, it is found in: * **Small Motors:** Hairdryers, fans, and blenders. * **Heating Elements:** Coffee makers and laminated heaters. * **Battery Packs:** Protecting against thermal runaway during charging. * **Transformers:** Preventing winding damage due to over-current.