Motor Starters

Additional Details

Conventional DOL motor starters are used for low power induction motors up to 7.5 hp due to very high starting current. Star-Delta Motor starters are used up to medium sized motors say up to 250 hp because the initial inrush current is limited up to three times of full load current. For high power motors Thyristor controlled Soft-starters are used to limit the starting current depending upon the torque requirement to avoid very high inrush current. VFD based starters are used for speed control and bi-directional purposes. VFD based starters are also used for energy efficiency of the plant. The motor power can be controlled depending upon the actual load requirement to have better efficiency. The other salient features of Motor Starters includes: Ø Range – 0.5 hp to 400 hp Ø Single phase & three phase applications Ø Speed control & reversible speed versions Ø Built-in overload & blocked rotor protections Ø High starting torque versions available Ø Built-in sequential control and plant protections Ø Local as well as remote control facility