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In series gives a gentler start then switched to parallel for full power running. When this is done with three phase motors, it is commonly called a star-delta (US: Y-delta) starter. Old star-delta starters were manually operated and often incorporated an ammeter so the person operating the starter could see when the motor was up to speed by the fact the current it was drawing had stopped decreasing. More modern starters have built-in timers to switch from star to delta and are set by the electrical installer of the machine. The machine's operator

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