Can the Motor Protective Relay "SE" be used in an inverter circuit?Last Updated: September 20, 2018
No, it cannot be used.
Motor Protective Relay "SE" is designed in order to protect the motor at sine wave frequency of 50/60Hz.
Therefore, if the SE is used in an inverter circuit, errors may occur with the overload element, and unnecessary operation may be performed with the open-phase or reverse-phase element.
For the above mentioned reason, overload, open-phase, or reverse-phase protection functions cannot be used at all.
For motor protection of the inverter control, use the Motor Protective Relay "K2CM Series" or the Multiple Motor Protective Relay "K2MR Series".