TMRF03-Thermal Fuse Built-in Resistor
A Thermal Fuse Built-in Resistor is an integrated electronic component that combines a precision resistor with a thermal fuse in a single package. It is designed to provide dual functions: stable resistance regulation for circuit operation and overtemperature protection to cut off the circuit automatically when abnormal heating occurs. This component is widely used in power supplies, household appliances, and industrial equipment where both current limiting and thermal safety are required.
Basic Structure & Working Principle
- Dual-component Integration
The component consists of two core parts: a resistive element (usually a metal film, carbon film, or metal oxide film resistor) and a thermal fuse (a temperature-sensitive fusible alloy or organic polymer material). These two parts are connected in series inside a sealed housing (typically made of flame-retardant epoxy resin or ceramic).
- Normal Operation State
Under standard working conditions, the thermal fuse remains in a closed state, and the resistor performs its designed function-such as current limiting, voltage division, or signal sampling-in the circuit.
- Overtemperature Protection Mechanism
When the circuit experiences faults (e.g., short circuits, component aging, or excessive load) that cause the temperature to rise beyond the fuse's rated activation temperature, the fusible element inside the thermal fuse melts rapidly. This breaks the circuit connection, cutting off power supply to the protected area and preventing further damage to equipment or fire hazards.
Feature:
Low cost
Low noise
Reduce circuit components
RoHS compliant, lead free
Appliacation:
Tele-communication,Surge pulse protection, Household appliances
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