By-pass device used in gentle start apparatus for controlling operating current of electric motor, has heat dissipation portion or heat sinks for dissipating heat from input and output conducting paths, fixed contact and movable contact

摘要

The by-pass device (300) has an input conducting path (115) and an output conducting path (125) which can be connected with each other or disconnected from each other using a fixed contact (250) and a movable contact (140) based on a control signal. The by-pass device also has heat dissipation portions (301) or heat sinks formed for dissipating heat from the input and output conducting paths, fixed contact and movable contact.