DC 500V Photovoltaic System Safety / LAD1-C40 Surge Arrester
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Estimated delivery: 07 Jun - 11 Jun
DC 500V Surge Arrester for Photovoltaic Systems
The LAD1-C40 surge arrester protects your solar energy investment against voltage spikes caused by lightning, atmospheric discharges, and grid fluctuations. Mounted on a DIN rail in the photovoltaic system's electrical panel, this device acts instantly to divert excess energy away from the inverter, solar modules, and storage systems. The direct and IEC-certified solution for any PV installation up to 500V DC.
What you get with this product
- Immediate protection for the inverter and solar modules against overvoltages caused by lightning — avoiding costly equipment replacements
- Compatible with photovoltaic systems up to 500V DC — integrates directly into standard residential and commercial installations
- Integrated thermal safety — the device automatically disconnects if the overvoltage exceeds the permissible limit, preventing fires
- Quick mounting on 35mm DIN rail — installs in the existing electrical panel without additional modifications
- IEC 61643-11 certified — complies with the strictest international safety standards for surge protective devices
- Visible status indicator — check at a glance if the device is functional or needs replacement
How it works and how to install it
The LAD1-C40 arrester connects in parallel on the DC line between the panels and the inverter, mounting on the DIN rail in the photovoltaic system's distribution panel. When a voltage peak occurs, the device diverts the surge current to the ground, protecting the connected equipment. Installation is performed by an authorized electrician within the solar installation's DC panel, without special tools, by simply fixing it to the rail and connecting the cables to the DC+ and DC- terminals.
Frequently asked questions
Is this arrester compatible with any 500V solar inverter?
Yes, the LAD1-C40 is compatible with any photovoltaic system with a maximum open-circuit voltage of up to 500V DC, regardless of the inverter manufacturer.
Does it need to be replaced after absorbing an overvoltage?
It depends on the intensity of the event. The visible indicator on the device clearly signals if the protection module has been used up and needs replacement — checking is simple and quick.
What is the maximum discharge current supported by the device?
According to the data inscribed on the device, the maximum discharge current is 40kA, and the nominal discharge current is 20kA, according to IEC 61643-11 standard.
Technical specifications
| Model | LAD1-C40 |
| Maximum continuous operating voltage (Uc) | DC 500V |
| Nominal discharge current (In) | 20kA (8/20) |
| Maximum discharge current (Imax) | 40kA (8/20) |
| Voltage protection level (Up) | max. 2.8kV |
| Protection type | Class C (Type 2) |
| Standard | IEC 61643-11 |
| Mounting | 35mm DIN rail |
| Number of poles | 2P (DC+ / DC-) |
| Certification | CE |
| Brand | DALBI |
| SKU | Q-16G001 |
Warranty and support
The product benefits from a 2-year legal warranty in accordance with current Romanian legislation. We accept returns within 30 days from the date of receipt, at no additional cost for unused products. Delivery is carried out quickly by courier throughout Romania.
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