Surge Protection Device HiSmart NV821754 4‑pole 1000 VDC

HiSmart NV821754 is a 4-pole surge protection device for DC systems, rated for 1000 V DC. It is designed to protect photovoltaic arrays, battery systems and industrial DC equipment from transient overvoltages caused by indirect lightning strikes and switching events. The device mounts on a 35 mm DIN rail and connects in-line with the DC supply to divert surge energy away from sensitive components.

Advantages

The NV821754 offers Class B protection with a nominal discharge current of 60 kA and a maximum discharge current of 100 kA, providing a high level of surge attenuation for DC systems up to 1000 V. Its response time of under 25 ns and a voltage protection level up to 5 kV ensure rapid clamping of transient overvoltages. The compact design (107 x 90 x 67 mm) and DIN-rail mounting simplify installation in solar combiner boxes and DC switchgear. The unit is manufactured to IEC 61643-1 standards and carries CE marking.

Suitable for

• Photovoltaic (PV) arrays and solar inverter DC inputs
• Battery energy storage systems (BESS)
• Wind power DC equipment and converters
• Industrial DC power distribution and control panels

Key specifications

• Poles: 4 (4P)
• Class: B
• Maximum continuous operating voltage (Uc): 1000 V DC
• Nominal discharge current (In): 60 kA
• Maximum discharge current (Imax): 100 kA
• Voltage protection level (Up): ≤ 5 kV
• Response time: < 25 ns
• Frequency: 50/60 Hz
• Operating temperature: -40 °C to +85 °C
• Relative humidity (at 25 °C): < 95%
• Installation: 35 mm DIN rail
• Wires cross-section: 4–6 mm²
• Dimensions: 107 x 90 x 67 mm
• Standards: IEC 61643-1, CE
• Warranty: 24 months

How to use

Mount the HiSmart NV821754 on a 35 mm DIN rail inside the DC distribution enclosure or combiner box. Connect the device in-line with the DC positive and negative conductors according to the system wiring diagram and local electrical regulations. Ensure conductor cross-sections between 4 and 6 mm² and tighten terminals to the recommended torque. Verify polarity and correct routing of surge paths before energizing the system. Perform a visual inspection and functional checks after installation and after any recorded surge event.

Recommendations

Install the surge protection device as close as practical to the protected equipment or DC input terminals to minimise lead length. Combine the NV821754 with proper system grounding and equipotential bonding. Replace the device if it shows visible damage or after exposure to a surge event that exceeds rated performance; follow local safety standards when servicing.