LEGION Overload Protector --Thermal Overload Protection Switch (Thermal Relay Principle)Working Principle:Protects through the thermal effect of electric current, primarily composed of a bimetallic strip, heating element, and tripping mechanism. 1. Heating Element: Connected in series with the circuit, it generates heat when current passes through. The heat (Q) is proportional to the square of the current (Q=I²Rt).2. Bimetallic Strip: Made by rolling and bonding two metals with different expansion coefficients (e.g., steel and copper). Under normal current, it remains unchanged; when overloaded, the heating element raises its temperature, causing the bimetallic strip to bend due to expansion coefficient differences.3. Tripping Mechanism: When the bimetallic strip bends to a certain degree, it triggers the tripping mechanism to disconnect circuit contacts and cut off the power supply.4. Reset Mode: Requires waiting for the bimetallic strip to cool before manual or automatic reset (some models support automatic reset, but manual reset is more common for safety).
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