Pretensioning is self-resetting devices for the current-limiting protection switch release systems

摘要

A circuit breaker (100, 300) comprises a housing (102), a trigger mechanism (108) and a release lever (110, 302), between a first position and a second position. The release lever includes a first end (114, 306), which can be selectively is in contact with the release mechanism, and a to the first end opposite end (116, 308). The circuit breaker further comprises a biasing means (118, 310), one receiving means (202, 402), which is coupled to the casing, and a lever arm (204, 404), which is coupled with the receiving. The lever arm includes an engagement surface (206, 408) to the second end is in contact and is arranged to between an initial position which corresponds to the first position, and an end position, which corresponds to the second position to move. The biasing means further comprises a biasing member (214, 410), which is located between the seat and the lever arm and the surface of action against the second end biases. The lever arm exerts a first torque in the first position and exerts a second torque, which differs from the first torque, in the second position.