The **TP2CMPQT** is a specific part number typically associated with **Thermal Protectors** or **Thermostat Switches**, often manufactured by companies like *Sensata (Klixon)* or *Cantherm*. These components are designed to protect electric motors, ballasts, and appliances from overheating. --- ### 1. Key Technical Specifications The part number follows a specific nomenclature that defines its electrical and physical characteristics. | Feature | Description | | :--- | :--- | | **Component Type** | Bimetallic Thermal Protector | | **Contact Type** | Normally Closed (NC) - opens on temperature rise | | **Operating Temp** | Usually calibrated between 70°C to 160°C (depending on suffix) | | **Voltage Rating** | 120VAC / 250VAC | | **Current Rating** | Typically 5A to 10A (Resistive) | | **Housing** | Often encapsulated in a plastic or metal case for insulation | --- ### 2. Functional Components The TP2 series operates using a simple but highly reliable mechanical mechanism: 1. **Bimetal Disc:** The "heart" of the device. It consists of two bonded metals with different thermal expansion coefficients. At a specific temperature, the disc snaps into a concave shape. 2. **Contact Points:** Silver-alloy contacts that remain closed during normal operation to allow current flow. 3. **Insulated Lead Wires:** High-temperature resistant wires (usually UL rated) for integration into motor windings or PCB assemblies. 4. **Spring Arm:** Provides the tension necessary to maintain a low-resistance electrical connection until the trip point is reached. --- ### 3. Application Use-Cases These parts are "Safety Critical" components. If they fail to open, the device may catch fire; if they fail to close, the device will not turn on. * **Electric Motors:** Placed inside the windings to prevent burnout if the motor stalls. * **Lighting Ballasts:** Protects against the "end-of-life" overheating effect in fluorescent or HID lighting. * **Battery Packs:** Monitors cell temperature during high-speed charging. * **Transformers:** Prevents insulation melting during overcurrent events. --- ### 4. Circuit Diagram Representation In an electrical schematic, the TP2CMPQT is represented as a thermal switch: ```text [ Line In ] | /----+----\ | ( T ) | <-- Thermal Switch (NC) \----+----/ | [ Load/Motor ] | [ Neutral ] ``` ---