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close this bookCircuits, Formulas and Tables Electrical Engineering - Basic Vocational Knowledge
close this folder5. Contactor Circuits
View the document5.1. Types of Excitation of the Control
View the document5.2. Possibilities of Representing Contactor Circuits
View the document5.3. Reversing Contactor Circuits
View the document5.4. Arc Extinguishing Circuits
View the document5.5. Three-contactor Star-delta Connection
View the document5.6. Squirrel-cage Induction Motor
View the document5.7. Sliping Rotor
View the document5.8. Interference Suppression
View the document5.9. Light-current Controlled Power Plant with Impulse Relay

5.1. Types of Excitation of the Control

Self-excitation

Advantage: no-voltage characteristic


Figure

Separate excitation


Figure

The contactor circuits are provided with permanent contact making


Control current locking

Advantage: By means of the control current locking contactor, no-voltage characteristic is attained in separately excited contactor circuits.