Features: 1) Insulation resistance between the end and the box: ≥5 x 104mΩ 2) Contact resistance between the lead and the end: ≤5 x 10-3Ω 3) Voltage-resistance strength: non-puncture, no arc-over 500V AC/1min 4) Environment: a) Environmental temperature: -55°C ~ +55°C b) Relative humidity: