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Three-phase voltage control relay

Recommendations for choosing a 3-phase control voltage relays read
 
 The voltage between phase and neutral (Ua, Ub, Uc) is called - phase.
 
 Example:
 In availability of neutral right to speak about phase voltages АС230V and thus the relay will control only АС230V.
 The voltage between two phase wires (UAB, UBC, UCA) is called - line.
 
 Example:
 In lack of neutral is right to speak about line voltages АС400V and accordingly the relay control only АС400V.

 

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