What is the working principle of photovoltaic DC switch?
- Classification：Company News
- Author：FMELEC
- Source：本站
- Release Time：2021-10-15
- Views： 443
Details
The working principle of the photovoltaic DC switch, the three contacts of the photovoltaic DC switch are connected in series in a three-phase main circuit, the coil of the electromagnetic release and the thermal element of the thermal release are also connected in series with the main circuit. The coil is connected in parallel with the main circuit.
When the photovoltaic DC switch is closed, the three main contacts are hooked on the hook through the locking key, which overcomes the pulling force of the spring and keeps the closed state. But when the electromagnetic release is attracted or the bimetal of the thermal release is bent by heat or the undervoltage release is released, any of the three actions will occur, thereby making the
The lever is lifted, disengaging the hook and locking key, and the main contacts are opened.
When the circuit is working normally, the electromagnetic force generated by the electromagnetic release coil cannot attract the armature, but when the circuit is short-circuited and a large current occurs, the electromagnetic force generated by the coil increases enough to attract the armature, disconnect the main contact, and cut off the main circuit. . If the circuit is overloaded, but the current of the electromagnetic release is not reached, the current
The overload current of the heating element of the overheat release will cause the bimetal to be bent by heating, lift the lever, separate the contacts, and disconnect the circuit, thus playing the role of overload protection. If the power supply voltage drops a lot or loses voltage, the electromagnetic force of the undervoltage release will be reduced, thereby tripping the armature and causing
The contact is disconnected and the circuit is cut off, thus playing the role of undervoltage or undervoltage protection.
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