Operation condition:

1. Altitude: ≤ 1000m

2. Ambient temperature: +40 to -10°C

3.Relative humidity shall not be more than 95% at +20°C ambient temperature.

4. No gas, wapor or dust that may severely affect the insulation of contact box, no explosive or corrosive substance.

 

 Technical requirements:

1.Coper contact to earth shall withstand power frequency test voltage (effective value) of 42kV for 5-minute and lightning impulse vpltage (peak value) of 75kV

2.Temperature of lead-out terminal shall not bemore than 65°C if the contact box is used for long time in rated current condition.