The utility model relates to a contactor for providing pre-charging for a large capacitor. Contactor comprising a housing and a contactor assembly, wherein the contactor assembly is arranged in the shell; wherein the shell comprises a lower shell, a mounting plate and a dustproof cover; the upper end of the lower shell is connected with the lower end of the mounting plate; the upper end of the mounting plate is connected with the dustproof cover; wherein the contactor assembly comprises a static iron core, a hollow coil, a movable iron core, a counter-force spring, a linkage rod, a linkage rodsleeve, a movable contact plate, a contact spring and a contact spring cover, a wiring board is arranged on the mounting plate, a pair of static contact plates is arranged on the wiring board, and apair of aluminum shell resistors is arranged between the pair of static contact plates. The aluminum shell resistor is additionally arranged between the static contact plates of the contactor, so thatcapacitor damage possibly caused by too large charging current and too large instantaneous current at the moment of direct power-on can be effectively prevented, the charging current can be inhibited, a power supply and a rectifying element are protected, and the use is safer and quicker.