It includes environmental adaptability design, safety and reliability design.
Environmental adaptability design
Different from general industrial contactor, the environmental conditions of high voltage contactors have more stringent requirements for the adaptability. It must meet the basic conditions of a wide temperature range, high protection level, and high vibration resistance.
1)High and low temperatures design: high voltage contactors need to meet the temperature requirements of electric vehicles and charging piles (stations) for normal use in extreme weather. Product storage environment temperature: -55~+125℃, normal working environment temperature is -25~+40℃, under extreme conditions, environment temperature is -40~+85℃,
2) Protection level design: high voltage contactors need to meet the normal work under severe environmental conditions and the normal use under rain and dust environment. It completely prevents dust from entering, meets the short-term water immersion requirements, and the protection level reaches IP67.
3) Anti-vibration performance design: high voltage contactors need to have strong vibration resistance and impact resistance. To meet the special needs of vehicles used in various road conditions and vibrations.
Safety and reliability design
Safety and reliability are the first and most critical element to measure the high voltage DC contactor of electric vehicles, which is mainly reflected in the arc extinguishing capacity and insulation voltage.
DC arc has no zero crossing point and it is difficult to extinguish the arc after arcing. The product structure is designed as a double-breakpoint direct-acting movement form. And the arc extinguishing technical means of filling compressed gas in the sealed arc extinguishing cavity can achieve good arc extinguishing ability. The main principle is: after the arc is heated, a high-pressure gas is formed with the filled gas. The increase of gas pressure makes the heat dissociation drop greatly. The pressure difference between the arc gap and the arc extinguishing chamber accelerates the gas movement, intensifies the cooling effect, and quickly extinguishes the arc.