The By Tronic S.r.l. SPI CEI 0-21 BY2537 is a professional Interface Protection System (Sistema di Protezione di Interfaccia) fully compliant with the CEI 0-21 standard for low-voltage grid-connected power generators.
It continuously monitors network parameters — voltage, frequency, and phase — and safely disconnects the photovoltaic or generator system from the grid whenever abnormal conditions are detected.

Designed and manufactured in Italy by By Tronic S.r.l., this reliable grid protection relay ensures compliance with Italian energy regulations and guarantees maximum operational safety for both renewable energy installations and industrial power systems.

🔄 Condition: Used
🛠 Warranty: 6 months by Green Energy

⚙️ Technical Specifications:

• Manufacturer: By Tronic S.r.l. (Italy)
• Model: SPI CEI 0-21 BY2537
• Function: Interface Protection Relay (Sistema di Protezione di Interfaccia)
• Compliance: CEI 0-21 standard (for LV generators ≤ 20 kW per inverter)
• Nominal Voltage: 230/400 V AC, 50 Hz
• Monitoring Parameters:
• Overvoltage (59) / Undervoltage (27)
• Overfrequency (81H) / Underfrequency (81L)
• Phase failure / Phase imbalance
• Trip Delay: Configurable per CEI 0-21 requirements
• Relay Outputs: 2 configurable contacts (trip / alarm)
• User Interface: LED indication and test buttons
• Auxiliary Supply: 230 V AC
• Mounting: DIN-rail modular design
• Protection Class: IP20 front, IP40 housing
• Operating Temperature: -20 °C … +60 °C
• Certifications: CE, CEI 0-21, RoHS compliant
• Origin: Made in Italy

📌 Key Features:
✔️ Designed and certified according to CEI 0-21 for Italian grid connection
✔️ Automatic disconnection under voltage or frequency anomalies
✔️ Integrated alarm relays for system protection
✔️ Compact modular construction for control panel installation
✔️ Trusted Italian manufacturing by By Tronic S.r.l.
✔️ Ideal for solar PV, wind, and generator interface protection

🚀 Stay compliant and protected with the By Tronic SPI CEI 0-21 BY2537 Interface Protection Relay — a certified Italian-made solution