Method for switching on an AC motor and star-delta motor protection switch with automatic switchover from star to delta connection.

摘要

The star-delta motor protection switch is designed for gentle starting of three-phase motors and causes automatic switching from star to delta. It consists of the three contactors K1, K2 and K3, of a plurality of relay terminals and. By electroless and spark-proof switching on the star and the delta contactor they can be charged with a larger motor rated current, allowing the use of smaller and lower-priced shooter. Thus, all three shooters can be used in the standard version with three main current and a control current contact pair, a circuit for producing the star connection as used in the motor terminal board, are required with only 2x2 main contacts for the star connection and needed a main current contact pair for the addition control current contact is used. This star-delta motor protection switch can be installed in a special motor protection switch housing. This enclosure has four sliding mounting holes, so it can be screwed without machining with minimal time spent on the terminal box under three-phase motors of various makes, frame sizes, designs and wattages.