The table below indicates the selection of the power switching components necessary to build up a star delta starters, with mechanical interlocks between star and delta contactors, suitable for mounting on DIN rail in a suitable control panel.
Notes:
In some cases, the starter can be supplied assembled (prefix LC3 ) with the overload relay supplied separately. These should be checked on a case-by-case basis, as some are obsolete.
Overload selection is based on the motor full load current (FLC) x 0.58 due to the mounting position in the 'delta loop'.
In the case of 110 and 132 kW there is a requirement for a separate control relay and timer to ensure sufficient delay in the changeover time from star to delta contactor.
The below drawing is an example of how a Star-Delta starter could look.
Notes:
In some cases, the starter can be supplied assembled (prefix LC3 ) with the overload relay supplied separately. These should be checked on a case-by-case basis, as some are obsolete.
Overload selection is based on the motor full load current (FLC) x 0.58 due to the mounting position in the 'delta loop'.
In the case of 110 and 132 kW there is a requirement for a separate control relay and timer to ensure sufficient delay in the changeover time from star to delta contactor.
The below drawing is an example of how a Star-Delta starter could look.
Released for:Schneider Electric Ireland
