A bimetallic strip thermal trip is a temperature-sensitive safety component in circuit breakers that disconnects circuits during overloads by bending due to differential thermal expansion.
A bimetallic strip thermal trip is a precision electromechanical component used in output circuit breakers for overcurrent protection. It consists of two bonded metal layers with different coefficients of thermal expansion. When excessive current flows through the circuit, resistive heating causes the strip to bend predictably, mechanically triggering a trip mechanism that opens the circuit contacts, thereby interrupting power flow and preventing equipment damage or fire hazards.
诱因 → 失效模式 → 工程缓解
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A bimetallic strip responds to thermal effects (slow, time-delayed protection against moderate overloads), while a magnetic trip responds to magnetic fields from high short-circuit currents (instantaneous protection). Many breakers combine both.
Yes, often via a calibration screw that changes the initial tension or position of the strip, allowing fine-tuning within the rated range, typically ±20%.
Common failures include metal fatigue from repeated bending, oxidation/corrosion at high temperatures, calibration drift due to material aging, or physical damage from vibration.
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