Surge Protection Device HiSmart NV821686 1P Class B 30–60 kA 385VAC

HiSmart NV821686 is a single-pole (1P) surge protection device Class B designed for installation in the incoming low-voltage distribution box to protect electrical installations and connected equipment from high-energy transients and lightning-induced surges. Rated for a maximum continuous operating voltage of 385 V AC, the device supports system types TT, IT, TN-S, TN-C and TN-C-S and complies with IEC 61643-1 and relevant GB and CE standards.

Advantages

The device provides a high maximum discharge current (Imax) of 60 kA and a nominal discharge current (In) of 30 kA, ensuring robust handling of lightning stroke currents up to 100 kA when installed correctly. With a fast response time below 25 ns and a voltage protection level (Up) of ≤2.2 kV, it limits overvoltage propagation to downstream equipment. Compact dimensions and DIN-rail (35 mm) mounting simplify installation in standard distribution boards.

Suitable for

• Protection of residential distribution boards and main incoming lines
• Commercial and light industrial low-voltage distribution panels
• Systems configured as TT, IT, TN-S, TN-C and TN-C-S
• Areas prone to lightning-induced transients

Key specifications

• Number of poles: 1 (single-pole, 1P)
• Class: B
• Maximum continuous operating voltage (Uc): 385 V AC
• Maximum discharge current (Imax): 60 kA
• Nominal discharge current (In): 30 kA
• Voltage protection level (Up): ≤2.2 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
• Wires cross-section: up to 6–10 mm²
• Dimensions (W×H×D): 18 × 90 × 67 mm
• Standards: IEC 61643-1, GB18802.1, GB50057, CE
• Warranty: 24 months

How to use

Install the HiSmart NV821686 on a standard 35 mm DIN rail in the incoming line of the low-voltage distribution box according to local wiring rules and the installation diagram. Connect the device in series with the supply conductor(s) using conductors within the specified cross-section range and ensure correct earthing for optimal protection. After wiring, verify connections, restore power, and check that the unit operates within its rated conditions.

Recommendations

Use this Class B surge protector as the first stage of surge protection at the service entrance for better protection of downstream devices. Complement it with appropriate downstream Type C or D protective devices for sensitive electronics and perform periodic inspections following local electrical codes.