what is meant by Auxiliary Voltage of Relay

[ss_engg]

i have technical specification of under voltage relay.. its electronics circuit design for the 110vdc but in technical specification its mention Auxiliary Supply is 220vAC i dont understand what does mean of Auxiliary Supply.

Technical Specifications:

Auxiliary Supply : 220VAC ± 20%
Voltages : 110VDC
Operating Voltages: 95% of rated
Output Relay : 250V @10Amp

 

[chuckey]

this is the voltage required to operate the electronics, not the supply being measured.
Frank

 

[ss_engg]

but for electronic circuit of that relay we provide 110vdc
the relay is microprocessor based ....
please clear the point thankyou