Low-voltage circuit breakers, commonly known as active air switches, are one of the primary electrical switches in low-voltage distribution networks. It can not only turn on and off normal load current, motor operation current and overload current, but also turn on and off short circuit current.
It is mainly used as a power switch in low-voltage distribution lines or switch cabinets (boxes) that are not often operated, and to maintain lines, electrical equipment and motors. When they present serious faults such as overcurrent, overload, short circuit, phase failure, and leakage, they can actively block the line to maintain the effect and be widely used.
Function: It can turn on and off the circuit infrequently, and actively disconnect the circuit when the circuit is overloaded, short-circuited or lost.
Features: safe operation, strong breaking capacity.
Category: Frame type (general-purpose type) and molded case type (equipment type)
Structure: touch system, arc extinguishing device, trip organization and transmission organization.
Operating principle: When the circuit is short-circuited or seriously overloaded, the armature of the overcurrent tripper is sucked to make the active tripping organization act; When the circuit is overloaded, the heat generated by the thermal element of the thermal tripper is added, which makes the bimetal bend upwards and promote the active tripping tissue action; When the circuit loses voltage, the armature of the loss-of-voltage tripper is released, which also makes the active tripper organize its action. The action of the active tripping organization disconnects the main contact and blocks the main circuit, which plays the role of short-circuit maintenance, overload maintenance and undervoltage maintenance respectively.
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