AC MAGNETIC STARTERS

AC MAGNETIC STARTERS

AC MAGNETIC STARTERS

ac magnetic starters

ac magnetic starters

AC MAGNETIC STARTERS There are several manufacturers of magnetic motor starters , and most have a different appearance . Several starters are shown in Figure 3–33 . The starter shown in Figure 3–33(A) contains a three-phase overload relay . The reset handle is shown below the overload relay . The starter in Figure 3–33(B) contains three separate singlephase overload relays . The load contacts of each relay must be connected in series . Each overload relay contains a separate reset lever . The starter shown in Figure 3–33(C) is part of a module designed to plug into a motor control center (MCC) . The module contains a fused disconnect , control transformer , motor starter , and terminal strips for making connections . Note that the fused disconnect contains only two fuses . A jumper wire replaces the center fuse . This is common on delta connected three-phase systems with a B phase ground . The NEC® does not require fuse protection for a grounded phase . The starter shown in Figure 3–33(D) is the same as the starter shown in the module in photograph (C) . Note the two normally open and two normally closed auxiliary contacts added to the sides of the starter . Many motor starters have the capability of adding additional auxiliary contacts to be used in the control circuit .

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