The **TP2CMPQ** is a specific part number typically associated with **Thermal Protectors** (also known as thermal cut-offs or thermostats), often used in industrial motors, appliances, and HVAC systems. These components are designed to protect electrical circuits from overheating. --- ### 1. Component Overview The TP2 series (of which the CMPQ is a specific variant) is generally a **bimetallic thermal protector**. It functions as a safety switch that opens the circuit when a specific temperature threshold is reached. | Feature | Description | | :--- | :--- | | **Component Type** | Bimetallic Thermal Cut-out / Protector | | **Action Type** | Normally Closed (NC) - Opens on temperature rise | | **Reset Type** | Automatic (Resets once the unit cools down) | | **Housing** | Often encapsulated in a plastic or metal case for insulation | --- ### 2. Key Specifications While exact specifications can vary by manufacturer (such as Sensata/Klixon or SEKI), the "CMPQ" designation usually refers to the following parameters: * **Temperature Rating:** Typically calibrated to a specific Celsius range (e.g., 70°C to 150°C). * **Electrical Rating:** Usually rated for 125VAC/250VAC at specific amperages (often between 2A to 7A). * **Contact Resistance:** Very low (under 50mΩ) to prevent the protector itself from generating heat. * **Durability:** Designed for high cycle life (typically 10,000+ operations). --- ### 3. Internal Mechanism The device operates on the principle of differential expansion of two different metals: 1. **Normal State:** The bimetal disc is in contact, allowing current to flow through the device to the load. 2. **Overheat State:** As the ambient temperature or current-induced heat rises, the bimetal disc reaches its "Snap" point. 3. **Action:** The disc snaps into a concave shape, physically separating the contacts and breaking the circuit. 4. **Reset:** Once the temperature drops below the "Reset" threshold, the disc snaps back to its original position, closing the circuit. --- ### 4. Application Areas These parts are critical for preventing fires and equipment damage in: * **Small Motors:** Hairdryers, fans, and vacuum cleaners. * **Transformers:** Preventing coil insulation melt-down. * **Battery Packs:** Protecting against thermal runaway during charging/discharging. * **Solenoids:** Preventing burnout due to prolonged activation. --- ### 5. Identification and Substitutes When replacing a **TP2CMPQ**, pay close attention to the markings following the part number, as they indicate the **Opening Temperature**. ```text Example Marking: TP2-CMPQ 105C ^ ^ Series Trip Temp (105 Degrees Celsius) ```