CP-721 voltage relay with programmable display CP-721

Intended use
The CP-721 voltage relay is used to control the voltage of a single-phase network and protect a single-phase receiver against the effects of an increase or decrease in voltage beyond the set values. is the value of the currently measured voltage.
User-set lower (UL) and upper (UH) voltage threshold determines the so-called voltage window, within which changes in the supply voltage may occur, which do not cause the relay to operate. With the correct supply voltage, the relay contact remains closed. Changing the supply voltage above or below the set voltage thresholds will open the contact with a time delay set by the user. The red LED indicates the contact closure status. Exceeding the voltage value above 5V from the set threshold values UH and UL is signaled by the pulsation of the display.
Reconnection of the relay contact will take place automatically in the event of a permanent voltage value by 5V in relation to the set threshold values UH and UL for the return time set by the user. The relay can be supplied with voltage up to 450V~. This allows for effective protection of the receiver even when the voltage exceeds the permissible standards. Also, in cases of power supply polarity reversal, it will not cause damage ("burning") of the relay.