Three-phase digital voltage protection relay with phase sequence control (without neutral wire), DGK-04F

Digital three-phase voltage protection relay on DIN rail, Tense

The Tense DGK-04F microprocessor protection relay is designed for comprehensive protection of sensitive industrial equipment and motors against risks associated with voltage fluctuations in three-phase networks. The device continuously monitors the total voltage and provides highly accurate protection against overvoltage, undervoltage, and phase sequence errors. A distinctive feature of this model is the connection without the need to connect the neutral wire (in asymmetric/three-wire networks).

The relay is equipped with digital displays that provide an instant overview of the status of individual phases. The user can precisely set voltage limits and time delay to filter out short network peaks and prevent unwanted activation. The compact modular design ensures easy installation on a standard 35 mm DIN rail.

Main functions and protections

• Overvoltage and undervoltage protection: automatically disconnects the output if the voltage exceeds or falls below the set limits.

• Phase sequence control: prevents motor operation in the opposite direction in case of incorrect phase connection.

• Without neutral wire (Non-Neutral): Ideal for systems where the N wire is not available or not required.

Technical specifications

• Product Type: Digital Voltage Protection Relay

• Number of Phases: 3 (three-phase connection without N)

• Rated Operating Voltage ($U_n$): 3× 380 V AC (50/60 Hz)

• Mounting Type: 35 mm DIN mounting rail / mounting panel

• Output Contact: 5 A / 250 V AC (resistive load)

Setting Ranges

• High Voltage Protection: 400 – 460 V AC (adjustable)

• Low Voltage Protection: 230 – 360 V AC (adjustable)

• Error Waiting Time: 0.1 – 10 s (adjustable)