Patent ID: 8390405
Filing Date: 2013-03-05
Classification: H01H

Abstract:
1. A circuit breaker, comprising: a trip unit configured to detect an accident current; a switching mechanism configured to separate a moveable contact from a fixed contact in response to receiving a signal from the trip unit that indicates occurrence of the accident current; a shaft configured to be rotated by the switching mechanism; a connecting plate fixedly-coupled to the shaft; a moveable plate rotatably coupled to the connecting plate and comprising the moveable contact that is configured to contact or separate from the fixed contact; a latching plate rotatably coupled to the moveable plate; and a latching spring formed as an elastic spring having one end fixed to the latching plate and another end fixed to the movable plate and configured to receive an elastic force in a direction that the moveable contact is spaced from the fixed contact, wherein a sliding recess is formed at the moveable plate and a cam surface is formed at the latching plate in order to implement a different opened degree of the sliding recess when the latching plate is rotated, and wherein a first latching in for fixing the one end of the latching spring is coupled to one end of the latching plate and a second latching in for fixing the another end of the latching spring is inserted into the sliding recess such that the latching spring is slidably coupled to the cam surface of the latching plate.