Contactor
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A contactor is a type of relay with high power rating. Contactors usually refer to devices switching more than 15 amperes or in circuits rated more than a few kilowatts. Contactors are typically used
Powerful DC contactor with electro-pneumatic drive
Three-phase electric power
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Three-phase electric power is the most widely used form of alternating current for electricity generation, transmission, and distribution. It is a type of polyphase system that uses three wires and is
Contactor
…common circuit between them. Other relays may have a common contact that connects to a neutral position. Contactors are typically built for and used in three-phase applications; other relays are more commonly used in single-phase applications. Contactors generally have special structures for arc suppression to…
Three-phase transformer with four-wire output for 208Y/120 volt service: one wire for neutral, others for A, B and C phases
The first AC motor developed by Italian physicist Galileo Ferraris. This was a two-phase motor and required four wires.
Three-phase electric power transmission lines
Three-phase transformer (Békéscsaba, Hungary): On the left are the primary wires, and on the right are the secondary wires.