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

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

The microprocessor-based protection relay Tense DGK-04F is designed for comprehensive protection of sensitive industrial equipment and motors against voltage fluctuation hazards in three-phase networks. The device continuously monitors the combined voltage and offers highly accurate protection against overvoltage, undervoltage, and incorrect phase sequence. A distinctive feature of this model is the connection that does not require a neutral wire (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 thresholds and time delay to filter out short network spikes and avoid unwanted switching. The compact modular design ensures easy installation on a standard 35 mm DIN rail.

Main functions and protections

• Over- and undervoltage protection: Automatically switches off the output if the voltage exceeds or falls below set limits.

• Phase sequence control: prevents motors from running in the wrong direction due to incorrect phase connection.

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

Technical Parameters

• Product Type: Digital Voltage Protection Relay

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

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

• Mounting Method: 35 mm DIN rail / mounting plate

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

Setting Ranges

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

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

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