Compact design: The outer diameter is reduced by 40% (Φ 90mm) compared to traditional porcelain sleeves, suitable for KYN28 switchgear; Intelligent identification: pre-set red/yellow/black phase identification sleeve, reducing the misconnection rate by 95%. Electrical testing: Lightning impulse withstand voltage 125kV (GB/T 3048.8), 1.2/50 μ s waveform; Mechanical strength: Axial tensile strength ≥ 180N (IEC 61479), withstand mechanical vibration of switchgear (5-200Hz/3g)