Surge Protection Device HiSmart NV821747 3P 1000 VDC

HiSmart NV821747 is a 3-pole surge protection device designed for DC systems up to 1000 VDC. It protects photovoltaic arrays, inverters, controllers and other DC equipment from transient overvoltages caused by lightning induction, direct strikes or switching events. The compact module mounts on a 35 mm DIN rail and provides a measurable reduction in surge risk for industrial and renewable-energy DC installations.

Advantages

The NV821747 offers Class C protection with a nominal discharge current of 20 kA and a maximum discharge current of 40 kA, delivering fast response (under 25 ns) and a voltage protection level up to 3.6 kV. It complies with IEC 61643-1 and CE standards, fits standard 35 mm DIN-rail mounting, and supports wire cross-sections of 4–6 mm². Operating range covers -40 °C to +85 °C and relative humidity below 95% at 25 °C.

Suitable for

• Photovoltaic (PV) arrays and solar power systems
• DC inverters and power controllers
• Wind-power DC systems and industrial DC equipment
• Protection of long DC cable runs vulnerable to lightning or switching surges

Key specifications

• Poles: 3P
• Class: C
• Maximum continuous operating voltage (Uc): 1000 V DC
• Nominal discharge current (In): 20 kA
• Maximum discharge current (Imax): 40 kA
• Voltage protection level (Up): ≤ 3.6 kV
• Response time: < 25 ns
• Frequency: 50/60 Hz
• Operating temperature: -40 °C to +85 °C
• Relative humidity (at 25 °C): < 95%
• Mounting: 35 mm DIN rail
• Wire cross-section: 4–6 mm²
• Dimensions: 54 × 90 × 67 mm
• Standards: IEC 61643-1, CE
• Warranty: 24 months

How to use

Install the HiSmart NV821747 on a standard 35 mm DIN rail in the DC distribution or combiner box, connecting the three poles to the appropriate DC conductors according to system polarity and local wiring rules. Ensure wire cross-sections match the 4–6 mm² recommendation and that connections are tightened to the manufacturer's torque specifications. Place the device close to the protected equipment or at the point where the DC supply enters the installation to achieve optimal surge diversion.

Recommendations

For reliable protection, verify compatibility with system voltage (1000 VDC maximum) and replace the device after an extreme surge event or when indicator/monitoring shows end-of-life. Regular visual inspections and periodic testing of the DC system grounding and surge protection elements are recommended to maintain protection performance.