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We have some VAJZ13AF2241BA relays. Are these even close?

I've noticed some electrical-mechanical overcurrent(50/51) relays labeled 50/60 Hz and others labeled 60 HZ. We have been requested to calibrate several relays for 50Hz operation. Is there a consideration for 50 vz 60 Hz calibration of the same relay? We are in a 60Hz country. Thank you.

Peterb; I too went thru school with a slide rule, and microprocessers still baffle me...I can design a tube ckt still...I think. My point was that often times, in the lab or just fooling around, you "discover" something and then imagine a practical application for it. The...

Having been there before, I often wonder if something is found in a "lab experiment" and then we spend an enormous amount of time trying to describe it. I wonder if a great deal with regards to induction discs was empirically derived? I don't think there are any engineers left that...

Rebuilt GE Frame 1500, with switchgear, no transformer, etc approximately $3,000,000.00 USD