The JCQ-1H600HF high-voltage DC contactor has a set of bridge type dynamic closing main contacts and two sets of conversion auxiliary contacts. The contacts have no polarity and do not need to distinguish the direction of current during use. The ceramic sealing structure has no risk of arc leakage, ensuring no fire or explosion. It has a current carrying capacity of 600A for a long time under high temperature (85 ℃) and low pressure (2.5kPa), 750Vd. c. It has built-in coil transient suppression function and is applied in aerospace and other fields.