The usage of the lower limit alarm meter is very simple. First, connect the power supply to AC220V or AC110V, and connect it to the "source" side. Then connect the input current to both ends of "m", pay attention to the positive and negative stages. If the current is greater than 10a, connect the shunt and then connect to both ends of "m"

Relay output signals are respectively connected to "high" and "low", with "high" as the upper limit and "low" as the lower limit. The wire connection method is the same as follows: take "high" as the upper limit, for example, and generally connect "a C" as normally open. When the current is greater than your set value, the relay of ammeter works.