Pronto Energy 
KNY2-40PV DC Surge Protective Device (DC SPD)
The KNY2-40PV DC surge protective device protects photovoltaic and DC systems from transient overvoltages up to 800V. Available as a Type1+2 surge protective device compliant with IEC 61643-31, it diverts lightning and switching surges to protect inverters, combiner boxes and DC loads.
Applications & circuit protection
The KNY2-40PV DC SPD is designed for solar and DC power systems where transient protection is critical. It is installed in combiner boxes, inverter DC inputs and DC distribution boards.
- Photovoltaic combiner boxes
- Inverter DC input protection
- DC distribution boards
- Solar monitoring and control equipment
Construction & operating reliability
The KNY2-40PV uses high-energy MOV elements tuned for DC operation, with thermal disconnection and clear status indication for reliable long-term protection.
- High-energy MOV for DC circuits
- Thermal disconnector with status indication
- Rated for {voltage} DC systems
- Compact DIN-rail mounting
Wiring Diagram
Technical Parameter
| Parameter | Value |
| Model | KNY2-40PV |
| Compliant with standards | IEC 61643-31; EN 50539-11 + A1 |
| Application | Photovoltaic DC surge protection |
| SPD category | Type 1 / Type 2 / Type 1+2 options |
| Number of product poles | 3P |
| Maximum PV voltage (Ucpv) | 800 V DC |
| Nominal discharge current (In) | 20 kA (8/20 μs) |
| Maximum discharge current (Imax) | 40 kA (8/20 μs) |
| Voltage protection level (Up) | ≤3.2 kV |
| Response time | <25 ns |
| Failure indication | Green = normal / Red = fault |
| Remote signal interface | Available |
| Flame-retardant grade | UL 94 V-0 |
| Protection level | IP20 |
| Operating temperature | −40 °C to +70 °C |
| Installation method | 35 mm DIN rail (EN 60715) |
Standards & certifications
The KNY2-40PV is designed in accordance with IEC 61643-31; EN 50539-11 + A1 and is available with CB, CE certifications. Certification documentation can be provided according to project and destination-market requirements.
- Standard: IEC 61643-31; EN 50539-11 + A1.
- Certifications: CB, CE.
- Protection level: IP20 (where applicable).
OEM & B2B supply support
KORLEN supports distributors, OEM manufacturers, electrical contractors and project buyers with product selection, samples, technical documentation and commercial quotations.
If the KNY2-40PV configuration does not match your project, send us the required specifications, quantity and destination market. Our team can help identify a suitable configuration.
- Samples available for product evaluation.
- Flexible quantities for project and B2B purchasing.
- OEM and ODM support for suitable projects.
- Technical documentation and certification support available.
Frequently Asked Questions
The KNY2-40PV protects photovoltaic and DC systems from transient overvoltages caused by lightning and switching, safeguarding inverters and DC equipment.
The KNY2-40PV is rated for 800V DC systems with 40kA discharge capacity.
It is installed at the DC side of solar systems, typically in combiner boxes or at inverter DC inputs.
Solar arrays are exposed to lightning transients. A DC SPD diverts these surges to earth before they damage inverters and electronics.
