| 摘要 |
A miniature circuit breaker comprises a housing (1), an electromagnetic tripping device, an overload tripping device, a lever (2), a U-shaped connecting rod (3), a trip member (4), a fixed contact (5), a movable contact (6), a hinge shaft (7) and an energy storage spring (8). The movable contact (6) comprises a lock catch (61), a support (62) and a movable contact (63). The support (62) is located on the housing (1) via the hinge shaft (7), and is provided with a first hinge shaft (621). The trip member (4) is sleeved on the first hinge shaft (621), and circumferentially swings with the first hinge shaft (621) as a center. The support (62) is provided with a second hinge shaft (622) thereon. The lock catch (61) is sleeved on the second hinge shaft (622), and has an extending portion (611) forming an interlocking structure with the trip member (4) upon contacting therewith, and an expanding portion (612) forming a first limiting structure with a protrusion (627) upon contacting. The lock catch (61) is provided with a resetting piece thereon, and the resetting piece generates a restoring force driving the lock catch (61) to swing to the protrusion (627). The miniature circuit breaker employs only the trip member, the lock catch and the support without any additional components to realize a connection among the trip member, the lock catch and the support, thus enabling a structure to be simpler and more compact. |
