Danger and warning
！
The device should be install by qualified people
The manufacturer shall not be held responsible for any accident
caused by the failure to comply with the instructions in this manual.
Risks of electric shocks, burning, or explosion
This device can be installed and maintained only by qualified people.
Before operating the device, isolate the voltage input and power
supply and short-circuit the secondary windings of all current
transformers.
Use a reliable voltage measurement device to make sure voltage cut
off.
Put all mechanical parts, doors, or covers in their original positions
before energizing the device.
Always supply the device with the correct working voltage during its
operation.
Failure to take these preventive measures could cause damage to
equipment or injuries to people.