Entering modern industrial civilization, circuit breakers, as one of the most important circuit protection appliances, have played an important role in industrial and civilian fields. When the current flow in the wiring is too large, such a simple circuit device will automatically cut off the power until the fault is eliminated. If there are no circuit breakers, line problems and equipment failures will easily cause electrical fires and other accidents, and people's electricity consumption will be very troublesome. This article will mainly introduce circuit breaker knowledge to you first: Circuit breaker working principle.
Circuit breakers operate primarily through the electrical or manual closing of the main contacts. The following describes the working principle of the circuit breaker from various operating states of the circuit breaker.
In normal operation, the line is connected: the main contact is closed, and the free tripping mechanism locks the main contact to the closing position. At this time, the coil of the overcurrent release and the thermal element of the thermal release are connected in series with the main circuit. , Undervoltage release coil and power supply in parallel.
Circuit short-circuit and severe overload: At this time the armature of the over-current release pulls in and makes the free tripping mechanism act, and the main contact disconnects the main circuit. When the circuit is overloaded, the thermal element of the thermal release heats up to bend the bimetal and push the free tripping mechanism.
Circuit under-voltage status: At this time, the armature of under-voltage release is released. Let the free trip mechanism act. In the long-distance control operation, the shunt release is selected. In normal operation, the coil of the release tripper is in the power-off state. When the remote control is performed, the start button can be pressed to energize the coil and the armature can drive freely. The buckle mechanism acts to disconnect the main contacts.
Circuit breakers operate primarily through the electrical or manual closing of the main contacts. The following describes the working principle of the circuit breaker from various operating states of the circuit breaker.
In normal operation, the line is connected: the main contact is closed, and the free tripping mechanism locks the main contact to the closing position. At this time, the coil of the overcurrent release and the thermal element of the thermal release are connected in series with the main circuit. , Undervoltage release coil and power supply in parallel.
Circuit short-circuit and severe overload: At this time the armature of the over-current release pulls in and makes the free tripping mechanism act, and the main contact disconnects the main circuit. When the circuit is overloaded, the thermal element of the thermal release heats up to bend the bimetal and push the free tripping mechanism.
Circuit under-voltage status: At this time, the armature of under-voltage release is released. Let the free trip mechanism act. In the long-distance control operation, the shunt release is selected. In normal operation, the coil of the release tripper is in the power-off state. When the remote control is performed, the start button can be pressed to energize the coil and the armature can drive freely. The buckle mechanism acts to disconnect the main contacts.
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