Main Lug Only
A Wye-Delta Starter is a traditional electro-mechanical method of reducing the applied starting voltage for a set period of time. This reduced voltage lowers the in-rush current from 6xFLA to 2xFLA, as well as reducing the starting torque. In a typical 480Y/277V application, 277VAC is applied to the motor for 5-10 seconds. After the time delay, the full 480VAC is applied across the line. This type of motor starter is used for industrial equipment such as large air compressors and pumps. Main Lug Only starters have no disconnect means and the short circuit protection is provided by the end user.