The dual-power automatic switch is a device controlled by a microprocessor and used to switch between grid power and grid power or grid power and generator power in the grid system, which can make the power supply continuous source. Series dual power supply, when the common power suddenly fails or fails, it is automatically put into the standby power supply through the dual power supply switch, (the standby power supply can also be powered by the generator under small load) so that the equipment can still operate normally. The most common are elevators, fire fighting, monitoring, lighting, etc.

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