| Working Principle The main contacts of the low-voltage circuit breaker are operated manually or by an electric closure. Once the main contacts are closed, the free脱扣 mechanism locks the main contacts in the closed position. The coil of the overcurrent release and the thermal element of the thermal release are in series with the main circuit, while the coil of the under-voltage release is in parallel with the power supply. In the event of a short circuit or severe overload in the circuit, the armature of the overcurrent relay is attracted, causing the free disengagement mechanism to operate, and the main contacts to disconnect the main circuit. When the circuit is overloaded, the heating element of the thermal relay heats up, causing the bimetallic strip to bend and activate the free disengagement mechanism, thereby opening the main contact and breaking the main circuit. When the circuit experiences under-voltage, the under-voltage release's armature is released, also causing the free release mechanism to activate, thereby breaking the main circuit. Upon pressing the auxiliary release button, the auxiliary release armature attracts and latches, causing the free release mechanism to operate, and the main contactor to disconnect the main circuit. Category Low-voltage circuit breakers are categorized based on the arc-quenching medium used. Breakers that use air as the arc-quenching medium are called air circuit breakers (air switches); those that use inert gases as the arc-quenching medium are known as inert gas circuit breakers (inert gas switches); and those that use oil as the arc-quenching medium are termed oil circuit breakers (oil switches). |
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