Air circuit breaker

Abstract

The present invention provides an air circuit breaker including an interlock apparatus. The air circuit breaker comprises a movable breaker body having a power source terminal and a load terminal and connecting or disconnecting a circuit between power source and a load, a cradle electrically and mechanically connected to or separated from the breaker body in accordance with movement of the breaker body and having a connector electrically and mechanically connected to the breaker body, a screw pipe guiding the connection to or separation from the breaker body and a power source terminal and a load terminal respectively connected to the power source and the load, a base frame fixed to the breaker body, a lead screw supported by the base frame so as to be rotatable and movable to a position for being inserted into the screw pipe and a position for being separated from the screw pipe, a interlock apparatus installed on the base frame and for indicating a position of the breaker body such as a disconnected position in which the breaker body is totally separated from the cradle, a testing position for testing the breaker body and a connected position in which the breaker body is connected to the cradle.

Description

technical field [0001] The present invention relates to a draw out type air circuit breaker, especially an interlock device for position display in a draw out type air circuit breaker, that is, when the circuit breaker is pushed into or pulled out of the bracket, it can accurately Displays disconnected, tested and connected locations. Background technique [0002] Generally, air circuit breakers are installed between electrical loads and power sources to protect load equipment such as motors and converters, etc., as well as abnormal currents (short circuits) that occur on lines such as transmission / distribution lines and private electricity , ground fault, overload current), which means that the circuit breaker uses air as the medium to eliminate the arc generated in the open / close contact. [0003] The air circuit breaker is divided into fixed type and drawer type. The fixed type is installed between the power supply and the load. The drawer type air cir...

AI Technical Summary

Problems solved by technology

[0021] However, in the interlocking device of the air circuit breaker in the prior art, the guide rod for the rotating cam is an integral rod with a certain length, and there is no additional guide part to support and guide the movement of the guide rod, so the guide rod is easily deformed or bent, the displacement of the display panel is also very imprecise, so it is impossible to show the precise position of the circuit breaker body

[0022] Also, for ease of handling and assembling the guide rods, there is a need for up-front tolerances that get larger over time, making it impossible to precisely control the displacement

Images