The LKP 120/10-I(IG) type polymer suspension line insulators with bird protection are designed for securing and insulating bare conductors of overhead power transmission lines (PTL) operating at 10–35 kV AC with frequencies up to 100 Hz. They provide protection for birds against electric shock upon contact with the insulator and prevent PTL outages caused by electrical flashovers due to birds or contaminants flowing from the crossarm of the support. The use of these insulators eliminates the need for additional bird protection devices. They are suitable for operation in ambient temperatures ranging from -60 °C to +50 °C and comply with the climatic version and placement category UHL 1 according to GOST 15150. Manufactured in accordance with TU 3494-005-57966314-2006, these insulators meet the standards of GOST 28856, GOST R 55189, and IEC 61109.

Key technical specifications of the LKP 120/10-I(IG) insulators include:

• Rated voltage: 10 kV.
• Rated mechanical breaking load: 120 kN.
• Overall height: from 330 to 380 mm, depending on the model.
• Insulation height: from 185 to 235 mm.
• Leakage distance: from 360 to 565 mm.
• Withstand voltage of full lightning impulse: from 170 to 215 kV.
• Power frequency withstand voltage in dry conditions: from 90 to 105 kV.
• Power frequency withstand voltage under rain: from 55 to 65 kV.
• Power frequency flashover voltage in polluted and wet conditions: not less than 13 kV.
• Specific surface conductivity of pollution layer: from 20 to 50 μS/cm.
• Permissible pollution degree according to GOST 9920: from III to IV.

The insulators are available with various combinations of end fittings, including: "fork-tongue" (VP), "fork-clevis" (VC), "socket-fork" (GV), "oval-clevis" (OS), "oval-tongue" (OP), "socket-oval" (GO), "clevis-tongue" (SP), "clevis-clevis" (SS), "socket-tongue" (GP), and "socket-clevis" (GS).