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Can I apply supply voltage of 127VDC continuously to pilot light body (ZB4BVBG*) which have voltage of 24-120V AC/DC ?

Yes, it can be used for continuous operation up to 132VDC or AC with out any problem. But all the specification will specify the voltage tolerance, which is generally considered as +/- 10%. As per our data sheet the voltage of 132V is arrived from 120V +10% = 132V. 

For any tolerance to be considered for upper side from 127VDC, if tolerance is applicable the voltage may go beyond 132 VDC, hence it may damage the indication lamps. They can use it for 127VDC with out any problem, if they ensure the maximum voltage is less than 132VDC.

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