Voltage, Current, and Temperature Protection Device for 3-Phase Circuits UZ2

The voltage, current, and temperature protection device UZ2 is designed to monitor and indicate the parameters of a three-phase network, as well as to provide protective disconnection of electrical equipment and/or signal activation in case of emergency situations. These include the following cases:

• power supply voltage going beyond the set limits;
• absence of one or two phases in the three-phase network;
• phase sticking;
• incorrect phase sequence;
• amplitude phase shift;
• phase imbalance;
• exceeding maximum consumption current;
• exceeding the temperature of the protected object.

The device measures voltage and current values for each phase separately and displays them on the built-in digital indicator with simultaneous status monitoring.
UZ2 allows displaying the consumed load power for each phase and the total for all three phases.
UZ2 performs the following functions:

• measurement and display of the effective or peak voltage value;
• measurement and display of the effective or peak consumption current value;
• calculation and display of the power consumed by the load;
• protective disconnection of the control starter in emergency situations;
• generation of an "Error" signal;
• data exchange with a personal computer via the RS-485 interface.

The device is powered from any phase where voltage is present. The sensor type for temperature control is NTC10k. Current measurement is performed by DTX-type sensors with a standardized 0-10 V output signal.