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

Tense DGK-04F Digital Three-Phase Voltage Protection Relay for DIN Rail

The Tense DGK-04F microprocessor-based protection relay is designed to provide comprehensive protection for sensitive industrial equipment and motors against risks associated with voltage fluctuations in three-phase networks. The device continuously monitors the line voltage and provides highly accurate protection against overvoltage, undervoltage, and phase sequence faults. A unique feature of this model is its ability to operate without a neutral conductor (asymmetrical/three-wire networks).

The relay is equipped with digital displays for an immediate overview of the status of individual phases. The user can precisely set voltage thresholds and time delays to filter out short-term network spikes and prevent unwanted tripping. 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 motors from running in the wrong direction in case of incorrect phase connection.

• Non-Neutral: Ideal for systems where a neutral wire is not available or 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 method: 35 mm DIN rail / panel mounting

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

Setting ranges

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

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

• Error waiting time: 0.1 – 10 s (adjustable)