Tense DGK-04 Digital Three Phase Over and Under Voltage Control Relay

The Tense DGK-04 is a high precision, digitally adjustable three phase voltage protection relay engineered to safeguard sensitive electrical machinery, engines, and automated industrial networks from hazardous grid fluctuations. Housed in a robust, compact DIN rail mount enclosure, this micro processed terminal continuously monitors phase to phase voltages without requiring a neutral wire loop connection (Non Neutral operational architecture).

Featuring a distinctive vertical layout of three independent 3 digit red LED displays, the DGK 04 provides simultaneous real time monitoring of all three line to line phases ( $L1-L2$ , $L2-L3$ , and $L3-L1$ ). This setup eliminates the need to cycle through screens to check phase stability.

Key Features

Simultaneous 3 Phase Voltage Display: Designed with three stacked, distinct 3 digit LED windows that provide immediate visual diagnostics of live operating parameters.
Adjustable Over Voltage Protection ( $U>$ ): Allows precise field adjustment of the high voltage threshold via a dedicated rotary dial from 400V to 460V AC.
Adjustable Under Voltage Protection ( $U<$ ): Provides customizable protection against voltage sags and brownouts, adjustable via potentiometer from 230V to 360V AC.
Configurable Error Waiting Time ( $t$ ): Equipped with a programmable trip delay dial selectable between 0.1 seconds and 10 seconds to minimize nuisance tripping during brief startup surges or momentary line drops.
Intelligent Fault Diagnostics: Built with front facing error LEDs ( $U>$ , $U<$ , and $Out$ ) alongside a blinking numeric display feature that immediately highlights exactly which phase combination caused the fault condition.

Technical Specifications

Feature	Specification
Model Number	DGK-04
Brand / Manufacturer	Tense Electronics
Operating Voltage ( $U_n$ )	$3 \times 380\text{V AC}$
Operating Grid Frequency	$50 / 60\text{ Hz}$ dual frequency autosensing
High Voltage Set Point ( $U>$ )	$400\text{V} - 460\text{V AC}$ (Adjustable potentiometer)
Low Voltage Set Point ( $U<$ )	$230\text{V} - 360\text{V AC}$ (Adjustable potentiometer)
Trip Delay Range ( $t$ )	$0.1\text{ sec.} - 10\text{ sec.}$ (Adjustable potentiometer)
Power Consumption	$< 6\text{VA}$ energy-efficient design
Output Contacts Configuration	1 SPDT dry contact terminal rated for output signaling
Mounting Architecture	Standard 35 mm DIN rail snap lock mechanism
Operating Temperature	$0^\circ\text{C} \dots +55^\circ\text{C}$

Applications

Electric Motor Protection Boards: Guarding heavy three phase induction motors, industrial fans, and extractors against phase imbalances, over voltage stresses, and single phasing burnouts.
Industrial Pump Station Protection: Preventing submersed pumps, wastewater systems, and hydraulic drives from running under low voltage conditions that risk winding degradation.
HVAC Chiller Control Networks: Shielding multi stage industrial air conditioning units and cooling compressors from power grid instability during heavy utility loading periods.
Main Sub Panel Distribution Gates: Functioning as an automatic line side safety gatekeeper that shuts down contactor loops to safeguard downstream factory automation equipment.