The open-core concept provides several operational advantages over conventional products. These include immunity to ferroresonance, explosion-proof construction, and robust resistance to very fast transient overvoltages. A key feature is its single insulation system for both transformer sections, which enhances safety and eliminates risks associated with primary insulation failures.

Available with rated voltages from 72.5 kV to 550 kV, rated currents up to 6000 A, and short-time withstand currents of up to 100 kA (250 kA dynamic), they meet the highest industry standards. 

From its inception in 1994, KONČAR has established a trusted global presence, with over 9,000 units currently in operation worldwide.

Additional design features:

• Custom-made design – tailored to individual customer requirements
• Enhanced measuring range for current cores 
• Unique open-core magnetic design – immune to ferroresonance
• Robust insulation system designed to withstand very fast transient overvoltages
• Explosion-proof design, resistant to internal electrical arcs
• Partial discharge-free under AC test voltage
• Oil expansion effectively managed by a stainless-steel membrane
• Broad operational temperature range from -60 to +60 °C
• Available in biodegradable insulating fluid-filled configurations
• Proven reliability in seismically active environments
• Optimized design with minimal oil requirements
• High operational safety with minimal maintenance requirements