What is the difference between automatic & semi-automatic
star-delta starters?
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Answer Posted / v. senthilkumar - skpcl
Fully Automatic Star-Delta: In these starts Start-Delta
operation is an automatic one, which is accomplished with a
Timer fitted inside the starter. The time period from Star
to Delta can be adjusted between 7 to 15 sec. The Starter is
provided with Bimetallic Thermal Relay for protection
against Overloading & Single Phasing Conditions.
Semi-Automatic Star-Delta: These Starters are operated with
3-push button systems, in which the third push button
(Yellow) is used to change the motor running sequence from
Star to Delta. Bimetallic thermal overload Relay is fitted
in these starters for protection against overloading and
Single Phasing problems.
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