Digital voltage control | phase sequence protection relay | 3-phase | 1-63A | 230-460V

Technical Specifications
Operating Voltage (Un): 3 × 380V AC
Operating Frequency: 50/60 Hz
Maximum Power: <6VA
Operating Temperature: -20°C to +55°C
Overvoltage Threshold (U>): 400V – 460V (adjustable)
Undervoltage Threshold (U<): 230V – 360V (adjustable)
Delay Time (t): 0.1 sec – 10 sec (adjustable)
Accuracy: ±1%
Display: 3 × 3-digit LED screen + LED indicator lights
Contact Load: 5A/250V AC (resistive load)
Connection Type: Terminal block
Maximum Cable Diameter: 2.5mm²
Mounting: DIN rail or panel mounting (cutout 91×91mm)
Weight: Max. 220g
Functions
Overvoltage and Undervoltage Protection – If the voltage exceeds or falls below the set thresholds, the relay disconnects the load.
Phase Loss and Sequence Protection – Ensures all three phases are correctly connected and prevents phase loss.
Voltage Imbalance Protection – Detects voltage differences between phases and disconnects equipment if imbalance exceeds allowed limits.
Adjustable Voltage Limits – Users can configure the voltage thresholds individually.
Delay Function – Prevents false disconnections due to temporary voltage fluctuations.
High Accuracy Measurement – ±1% error ensures precise and reliable data.
Clear Data Display – The three-line LED screen displays each phase voltage in real time.
Automatic Recovery – When the voltage returns to normal, the relay automatically reconnects the load.
Application
An ideal solution for industrial and commercial electrical networks where reliable voltage monitoring and protection are required. Used in:

Production Lines – Protects machines and production equipment from voltage fluctuations.
Industrial Buildings – Protects electrical systems and distribution panels.
Power Distribution Networks – Ensures network stability and minimizes failure risks.
Commercial Facilities – Protects sensitive electronics and equipment.
Pros
Wide voltage adjustment range (400V–460V, 230V–360V)
Integrated phase sequence and loss protection
LED display with clear voltage indication
Automatic recovery after voltage normalization
Compact design suitable for DIN rail mounting

Cons
No isolation function, requiring an additional circuit breaker
Not suitable for single-phase systems
Requires precise threshold adjustment to avoid false disconnections

A three-phase voltage protection relay is a reliable solution for ensuring electrical network stability. It offers comprehensive protection features and is easily adaptable for industrial and commercial use. Reliable performance, clear data display, and adjustable protection thresholds make this device indispensable for voltage control and protection against electrical disturbances.