The utility model discloses a contact fitting for OSM circuit breakers. The contact fitting comprises a wire clamping module and a wiring module which are manufactured integrally; the wire clamping module is composed of two wire clamping plates, one ends of the two separate wire clamping plates are integrally molded into a combined end, the other ends are separate ends hung in the air, and a first screw hole is opened at the combined end; and a second screw hole and a third screw hole are opened on the wiring module. The wire clamping plates of the contact fitting for OSM circuit breakers can provide constant contact pressure and maintain a low contact resistance and has strong transition capability, the contact fitting is simple in structure and convenient to install and repair, and the work efficiency is greatly improved.