Protecteur de surtension et de sous-tension EXUR7-3
Three-Phase Guard — Over, Under, Unbalance and Phase-Sequence Protection
The EXUR7-3 is a high-performance three-phase line protection device that continuously monitors the RMS voltage and current of all three phases and disconnects the load on overvoltage, undervoltage, overcurrent, phase-sequence error or three-phase unbalance. Configurable for AC220V three-phase four-wire or AC380V three-phase three-wire systems, in 63A, 80A and 100A ratings, with automatic reset after faults clear.
Modèle
EXUR7-3 Series — Three-Phase Over/Under Voltage ProtectorEXUR7-3□□ (63A / 80A / 100A; 220V 3P4W or 380V 3P3W)
AC220V (L-N) / AC380V (L-L) · phase sequence + unbalance · auto reset
Téléchargements
- Three-phase over/under voltage and overcurrent protection with per-phase RMS monitoring.
- Phase-sequence protection and adjustable three-phase unbalance protection (20-100V).
- Configured for AC220V three-phase four-wire (L-N) or AC380V three-phase three-wire (L-L); 63/80/100A.
- Automatic reset with configurable delays; digital display; 1NO output contact; IP20.
Détails du produit
General
The EXUR7-3 is a high-performance three-phase line protection device. It continuously monitors the effective values of three-phase voltage and current, and can quickly disconnect the circuit when preset overvoltage or undervoltage faults are detected, effectively preventing electrical equipment damage and safety accidents caused by power grid abnormalities or equipment malfunctions. After the fault is eliminated, the device supports automatic reset to restore power supply.
Caractéristique
Voltage and current display relay used in administrative, industrial and residential buildings and has the function of protecting single-phase lines:
- Working under voltmeter mode;
- Undervoltage protection;
- Overvoltage protection;
- Overcurrent proteciton.
- Phase-sequence protection;
- Three-phase unbalance protection;
Données Techniques
| Article | AC220V(Three-phase four-wire) | AC380V(Three-phase three-wire) |
| Rated supply voltage | Phase Voltage AC220V(L-N) | Line Voltage AC380V(L-L) |
| Operating voltage range | AC80_400V(Three phase) | AC140-400V(Three phase) |
| Rated frequency | 50/60Hz | 50/60Hz |
| Electric current adjusting range | 1-100A | 1-100A |
| Over-voltage setting range | 120-300V(220V) | 400-520V(380V) |
| Under-voltage setting range | 80-210V(220V) | 140-360V(380V) |
| Courant nominal | 63A/80A/100A | 63A/80A/100A |
| U<and U>trip delay | 0.1-10s | 0.1-10s |
| Reset/start delay | 1-999s | 1-999s |
| Voltage measurement accuracy | ±2% | ±2% |
| Rated insulation voltage | 400V | 700V |
| Output contact | 1NO | 1NO |
| Electrical life | 10⁵ | 10⁵ |
| Mechanical life | 10⁶ | 10⁶ |
| Degré de protection | IP20 | IP20 |
| Degré de pollution | 3 | 3 |
| Altitude | ≤2000m | ≤2000m |
| Température de fonctionnement | -5℃~+55℃ | -5℃~+55℃ |
| Humidité | ≤50%at 40℃(without condensation) | ≤50%at 40℃(without condensation) |
| Storage temperature | -30℃~+70℃ | -30℃~+70℃ |
Default Setting
| Technical parameter | Setting range | Step | Factory setting |
| Power-on delay time | 1-999s | 1s | 5s |
| Over-voltage protection value | 120-300V/400-520V | 1V | 270V/430V |
| Over-voltage recovery value | 115-295V/395-515V | 1V | 265V/425V |
| Over-voltage recovery delay time | 1-999s | 1s | 30s |
| Over-voltage protection action time | 0.1-10s | 0.1s | 0.5s |
| Under-voltage protection value | 80-210V/140-360V | 1V | 170V/300V |
| Under-voltage recovery value | 85-215V/145-365V | 1V | 175V/315V |
| Under-voltage recovery delay time | 1-999s | 1s | 30s |
| Under-voltage protection action time | 0.1-10s | 0.1s | 0.5s |
| Three-phase voltage error value | -9.5V~9.5V | 0.5V | 0 |
| Three-phase voltage unbalance value | 20-100V | 1V | 50V |
| Three-phase voltage unbalance protection switch | OFF/ON | 一 | ON |
| Phase sequence protection | OFF/ON | – | ON |
| Over-current protection value | 1-63A/80A/100A | 1A | 100A |
| Over-current recovery delay time | 1-999s | 1s | 30s |
| Over-current protection action time | 0.1-10s | 0.1s | 0.5s |
| Three-phase current error | -9.5A~9.5A | 0.5V | 0 |
| Continuous over-current protection times | 0-20/OFF | 1 | OFF |
Setup Menu
Display Panel
Reset / Start Delay Display
Voltage operating values are shown on L1-L2-L3 and on current during the start of delay counting on L2 Value display; After the delay is over, the output relays close and they will open normally.
Phase Sequence Error Indication
When a phase fault occurs, L1-L3-L2 is displayed, and the protectoris disconnected from the output power supply.
Indication of Continuous Over Current Faults
Continuous over current fault indicationDisconnect overload deviceStart the relay after manual reset.
Electrical Symbol
Product Status Description
- If a voltage fault is detected during the reset/start-up delay period, the output relay will energize and the fault indicator will light up.
- During normal operation, the screen displays the operating voltage and current values; if a voltage or current fault is detected, the output relay energizes and the fault indicator lights up.
- Voltage Fault: After a voltage fault occurs, if the input voltage is detected to have returned to within the hysteresis (Hys) range, the relay will automatically reset once the reset/start-up delay period concludes; the fault indicator will turn off, and the screen will display the operating voltage and current values.
- Current Fault: When the relay trips due to a current fault, it will automatically reset; during the reset/start-up delay period, the fault indicator turns off, and the screen displays the operating voltage and current values.
Wiring Diagram
The wiring diagram is for reference only; please refer to the actual wiring.
Overall and mounting dimensions (mm)
Comment Nous Soutenons Votre Entreprise
OEM / ODM
Pre-set thresholds and 220V/380V defaults with custom faceplates for machine and panel OEMs.
Market presets · Custom faceplates · Calibration data
Vente en gros
Factory-direct pricing for distributors serving industrial, agricultural and commercial three-phase customers.
Tarification usine · MOQ flexible · Expédition mondiale
Support distributeur
Wiring-scheme guides, threshold tables and priority production for partners in the motor protection market.
Wiring guides · Threshold tables · Priority lead times
Ready to Stock the EXUR7-3 Series?
OEM/ODM, wholesale pricing and distributor support — one enquiry gets you a factory-direct quotation for three-phase voltage protectors in 63A, 80A and 100A, configured for your 220V or 380V system.
Questions Fréquemment Posées
What is a three-phase voltage protector and what does it protect against?
A three-phase voltage protector monitors the three phases of a supply as a group and disconnects the load when the supply is unhealthy. The EXUR7-3 protects against overvoltage, undervoltage and overcurrent on any phase, incorrect phase sequence, and voltage unbalance between phases — the five fault classes that cause motor burnout, machine damage and control failure in three-phase installations.
Why is phase sequence protection important?
If two phases are swapped at commissioning or after maintenance, a three-phase motor reverses direction — dangerous for pumps, compressors and conveyors, and capable of destroying them. Phase-sequence protection verifies the order of L1-L2-L3 before closing the output and disconnects the load if the sequence is wrong, displaying the fault for the electrician.
What is three-phase voltage unbalance and when should I set it?
Unbalance is the difference between the highest and lowest phase voltages. Motor standards commonly warn that unbalance above 2-3% raises winding temperature significantly; the protector compares phase voltages and trips when the difference exceeds the user setting (20-100V). On a nominal 380V system a 50V default is permissive; set lower for sensitive motors.
Does the EXUR7-3 work on a 220V three-phase system?
Yes. Select the three-phase four-wire mode where phase voltage is 220V L-N (e.g. 380/220V four-wire networks), and the threshold tables automatically present the 220V-range settings (overvoltage 120-300V, undervoltage 80-210V). In three-wire 380V systems the device reads line-to-line and applies the 380V tables.
How does the EXUR7-3 reset after a fault?
After the fault clears and the line returns to the healthy window for the configured recovery delay, the output relay closes again automatically. If the continuous overcurrent count reaches its user limit (0-20), the device locks out and requires a manual reset — a deliberate behaviour that flags repeated overloads rather than endlessly re-closing onto a faulty load.
