1. Introducció
This manual provides comprehensive instructions for the installation, operation, and maintenance of the EARU Electric 3-Phase Voltage and Overcurrent Protector, Model EARU-1008. This device is designed to safeguard 3-phase electrical systems by continuously monitoring voltage and current, offering protection against over-voltage, baix voltage, overcurrent, and phase failure. It is suitable for industrial and commercial applications requiring reliable electrical monitoring and protection.
2. Informació de seguretat
ADVERTÈNCIA: Perill de descàrrega elèctrica. La instal·lació i el manteniment només els ha de dur a terme personal qualificat.
- Desconnecteu sempre l'alimentació abans d'instal·lar o fer el manteniment del dispositiu.
- Assegureu-vos de posar a terra correctament per evitar descàrregues elèctriques.
- Verifiqueu que totes les connexions de cablejat siguin segures i correctes segons el diagrama de cablejat.
- No feu funcionar el dispositiu si sembla que està danyat.
- Compliu tots els codis elèctrics locals i nacionals.
3. Producte acabatview
3.1. Característiques clau
- Real-time 3-Phase Monitoring: Mostra el volum en directetage (L1, L2, L3) and current (L1, L2, L3) values.
- Protecció integral: Mesures de salvaguarda contra el sobrevolumtage, baix voltage, overcurrent, and phase failure.
- Paràmetres ajustables: User-configurable settings for protection thresholds and recovery delays.
- Automatic Phase Failure Reset: Detects and automatically resets after phase anomalies.
- High-Visibility LED Display: Bright red LED for clear readings in various lighting conditions.
- Muntatge en carril DIN: Easy integration into standard electrical panels.
- Clear Terminal Labeling: Simplified installation with clearly marked input and output terminals.
3.2. Components i pantalla
The device features a clear LED display and intuitive control buttons for configuration. The display shows real-time voltage and current for each phase, along with indicators for protection status.

Imatge 3.2.1: Davant view of the EARU Electric Voltage Protector, showing the LED display for L1, L2, L3 voltage and current, along with control buttons (SET, Up, Down, Power) and protection indicators. Terminal labels for N, L1, L2, L3 (IN and OUT) are also visible.

Imatge 3.2.2: Una perspectiva view highlighting the product features and the input/output terminals (N, L1, L2, L3) at the top and bottom of the device. This image emphasizes the physical layout and connection points.
4. Configuració i instal·lació
4.1. Muntatge
The EARU-1008 is designed for DIN rail mounting. Securely attach the device to a standard 35mm DIN rail within an electrical enclosure.
4.2. Connexions de cablejat
Refer to the wiring diagram below for correct connections. Ensure all connections are tight and properly insulated.
- Connect the incoming neutral (N) and phase lines (L1, L2, L3) to the 'IN' terminals.
- Connect the outgoing neutral (N) and phase lines (L1, L2, L3) to the 'OUT' terminals.
- Comproveu totes les connexions abans d'aplicar energia.

Imatge 4.2.1: Detailed wiring diagram for the EARU Electric Voltage Protector, showing connections for N, L1, L2, L3 for both input and output. The diagram illustrates how to integrate the protector into a 3-phase electrical system.
5. Instruccions de funcionament
5.1. Engegada inicial
Once wired, apply power to the device. The LED display will illuminate, showing the real-time voltage and current for each phase.
5.2. Indicadors de visualització
- V: Voltagvisualització.
- A: Visualització actual.
- Potència: Output indication.
- >V: Sobrevoltage indicació.
- <V: Baix voltage indicació.
- > jo: Over-current indication.
5.3. Configuració de paràmetres
Use the 'SET' button to enter the configuration menu and the 'Up' and 'Down' keys to adjust values. Press 'SET' again to confirm and move to the next parameter. Hold 'SET' for 3 seconds to enter settings mode.

Imatge 5.3.1: A detailed guide to setting various protection parameters on the EARU Electric Voltage Protector. This includes overvoltage, minvartage, overcurrent, and recovery delay settings, with default values and adjustment ranges.
Key adjustable parameters include:
- Overvoltage Configuració de protecció: Range 230-300V (Default 270V).
- Overvoltage Protection Recover Setting: Range 225-295V (Default 265V).
- Overvoltage Recovery Delay: Range 1-500s (Default 30s).
- Overvoltage Trip Delay: Range 0.1-30s (Default 1.0s).
- Undervoltage Configuració de protecció: Range 140-210V (Default 170V).
- Undervoltage Protection Recover Setting: Range 145-215V (Default 175V).
- Undervoltage Trip Delay: Range 0.1-30s (Default 1.0s).
- Configuració de protecció contra sobreintensitat: Range 1-63A (Default 30A).
- Overcurrent Trip Delay: Range 0.1-30s (Default 1.0s).
- Voltage & Current Manual Error Calibration: Adjust for accuracy, range -9.5% to +9.5% (Default 0%).
- Power-on Delay Setting: Adjustable Range: 1-500S (Default: 10s).
5.4. Manual ON/OFF
The power button allows for manual switching of the device output.
6. Manteniment
The EARU-1008 is designed for minimal maintenance. However, periodic checks are recommended:
- Mantingueu el dispositiu net i lliure de pols i residus.
- Periodically inspect wiring connections for tightness and signs of wear.
- Assegureu-vos que hi hagi una ventilació adequada al voltant del dispositiu per evitar el sobreescalfament.
7. Solució De Problemes
Si el dispositiu no funciona com s'esperava, tingueu en compte el següent:
- Sense pantalla/Sense alimentació: Check the main power supply and all wiring connections.
- Protection Trip: Identify the active protection indicator (>V, <V, >I). Check the corresponding voltage or current levels. The device will automatically reset once conditions return to normal, based on configured recovery delays.
- Phase Failure: The device automatically detects and responds to phase failures, initiating a cut-off and auto-reset once the phase is restored.
- Lectures incorrectes: If readings appear inaccurate, consider performing a manual error calibration as described in Section 5.3.

Imatge 7.1: This image highlights the various protection features of the EARU Electric Voltage Protector, including phase failure cut-off, low voltage cut-off, high voltage cut-off, overload cut-off, phase sequence cut-off, and auto-reset on normal conditions. These are key aspects for troubleshooting protection trips.
8. Especificacions
| Paràmetre | Valor |
|---|---|
| Marca | EARU |
| Model | EARU-1008 |
| Vol. d'oferta nominaltage | AC 3*220V (N-L1/L2/L3) / 440V |
| Freqüència nominal | 50/60Hz |
| Over Current Protection Setting Range | 1-63A (Default 30A) |
| Més del voltage Protection Setting Range | 230-300V (Default 270V) |
| Sota el voltage Protection Setting Range | 140-210V (Default 170V) |
| Dimensions del producte | 20 x 10 x 20 cm |
| Pes de l'article | 450 g |
| Tipus de muntatge | Carril DIN |

Imatge 8.1: This image provides a visual representation of the EARU Electric Voltage Protector's dimensions and a table of key technical specifications, including voltage, frequency, and protection ranges.
9. Garantia i Suport
9.1. Garantia
The EARU Electric Voltage Protector (Model EARU-1008) comes with a Garantia del fabricant de 1 anys des de la data de compra, que cobreix defectes de materials i fabricació en condicions d'ús normal. Conserveu el comprovant de compra per a reclamacions de garantia.
9.2. Atenció al client
For technical assistance, troubleshooting, or warranty inquiries, please contact EARU customer support through your retailer or the official EARU website. Provide your model number (EARU-1008) and a detailed description of the issue for efficient service.





