（From: https://www.theengineerspost.com/）

Transformer is a static electrical equipment, which is used to convert a certain value of AC voltage (current) into another voltage (current) with the same frequency or several different values. It uses the principle of electromagnetic induction to A device for changing the AC voltage, the main components are the primary coil, the secondary coil and the iron core.

Power transformers are one of the main equipment of power plants and substations. The functions of power transformers are multi-faceted. They can not only increase the voltage to send electric energy to the power-consuming area, but also reduce the voltage to the use voltage at all levels to meet the needs of consumers. electricity needs. Three-phase transformers are widely used in industrial applications to transform voltage and current. Three-phase transformers are widely used in circuits with AC 50Hz to 60Hz and voltage below 660V, and are widely used in important equipment, precision machine tools, mechanical and electronic equipment, medical equipment, rectifiers, lighting, etc.

Transformers are usually used together with other electrical components. The following are some electrical components matched with three-phase transformers for your reference.

Brand	Product Catalog	Photo	Product Specification
Eaton	MCCB		NZM molded case circuit breakers four frame sizes with ratings from 20A up to 1600A,690V. Switching capacities up to 150 kA IEC, UL, CSA and CCC.
Eaton	Changeoverswitch,                                     Cam Switch		Eaton Moeller series T0 Changeoverswitches,  T0, 20 A, service distribution board mounting   IEC, UL, CSA and CCC
Chenyang	Hall Effect Current Sensor		Closed Loop AC/DC Hall Current Sensor CYHCS Power Supply: ±15V ~ ±24V DC, Window: 35mm
Eaton	Shunt release		Eaton Shunt release  Moeller series NZM - Molded Case Circuit Breaker.
Eaton	Remote operator		Eaton Remote operator Moeller series NZM - Molded Case Circuit Breaker.
Lovato Electric	MCB		Miniature circuit breaker,   1-4P - 6-10kA. characteristic C,D, 32A,IEC / UL1077
Phoenix	Terminal Block		Feed-through terminal block UT series, 1000V, Screw connection,CSA, UL
Eaton	Contact Block		Contact Block M22 Contact element,  Cage Clamp
Eaton	Miniature Circuit Breaker		Miniature Circuit Breaker,  AC Breaker, PL9X,PL10X, 6ka,10ka, RoHs and REACH
Eaton	Auxiliary contact		Auxiliary   Switch                    ZPX-IHK; trip indicating switch ZPX-NHK