Compact Protective Device

The SINOTIMER OBS-40 AC Surge Arrester is a protective mechanism designed for three-phase electrical installations, used to limit transient overvoltages caused by indirect lightning strikes or operational processes in the electrical network.

Features:

• Brand: SINOTIMER
• Model: OBS-40
• Type: AC Surge Arrester (SPD)
• Configuration: 4 poles (3 phases + N)
• Protection class: Type 2 (T2)
• Rated AC voltage (Uc): 385 V AC
• Nominal discharge current (In): 20 kA (8/20 µs) per pole
• Maximum discharge current (Imax): 40 kA (8/20 µs) per pole
• Protection level (Up): 1.8 kV
• Standards: IEC 61643-1, GB/T18802.1
• Applications: Protection of three-phase electrical installations

Operation and Construction:

The system features four SPD units in a modular housing, with clearly marked upper terminals for each phase (L1, L2, L3) and for N. The grounding connection is made via the lower terminal bearing the PE symbol.

Electrical Parameters:

• Maximum continuous AC voltage (Uc): 385 V AC
• Nominal discharge current (In): 20 kA (8/20 µs) per pole
• Maximum discharge current (Imax): 40 kA (8/20 µs) per pole
• Protection level (Up): 1.8 kV
• Test pulse type: 8/20 µs

Installation near the main entry point of the installation is recommended for effective protection. The SINOTIMER OBS-40 does not provide overcurrent or short-circuit protection and does not replace fuses or circuit breakers.

Proper grounding connection is essential for effective protection operation. If a unit indicates a fault, it is necessary to replace it to maintain the protection level.