Ross Hill 1004-0004-00 Sync Transformer, 600:120

Ross Hill 1004-0004-00 identifies the M-4580 synchronizing transformer with a 600:120 voltage designation; confirm phase, frequency, terminals, insulation, and mounting. Use the complete installed identifiers and equipment ratings as the ordering reference. Availability, condition, price, and lead time are confirmed for each request.

Independent supplier. Edmundson Industrial is not appointed, endorsed, or sponsored by any manufacturer named on this page. Ross Hill, NOV, GE, Clarostat, McCarron and other manufacturer names and part numbers appear here for identification only. Their use does not imply authorization, endorsement, or any current manufacturer relationship. Availability, condition, price, and lead time are confirmed for each request.

Sync transformer or potential transformer

Two documents, one number, two names. We are not going to declare one of them wrong.

The stock number is a lead and a trap

The same NSN is reported against a second reference, 5477-0. That is normal in government cataloguing, where one stock number can cover items from more than one supplier reference, and it is useful because it widens where you can look.

It is also exactly the sort of shared identifier that gets treated as proof two items are the same. We are not publishing that. A shared NSN means two references were catalogued to one stock number, which is a procurement fact rather than an engineering one. If you are working from a stock number alone, the ratio and the VA on the nameplate are what confirm you have the right item.

Also searched as

1004-0004-00 · 1004000400 · M-4580 · NSN 5950-01-370-5979 · 5950013705979 · Ross Hill sync transformer 600:120 · Ross Hill potential transformer

What an instrument transformer is actually selected on

Ratio and VA get you into the right family. Accuracy class, burden and polarity get you the right part, and none of the three is documented anywhere we looked.

That matters more here than on a power transformer page. A synchronising or metering circuit cares about phase relationship, so polarity marking is not optional, and a transformer that is correct in ratio and wrong in polarity will read plausibly and behave incorrectly. If your existing unit has legible polarity marks, photograph them. If it does not, say so, because that changes what we would need to establish before quoting.

What to send with your request

• Whichever of the three you have: the RHCC number, the manufacturer reference, or the stock number
• Where you read it, because a stock number and a stores number come from different systems
• The primary and secondary voltages and the VA printed on the nameplate
• Whether polarity marks are legible on the existing unit
• Whether the circuit is synchronising, metering, or protection, if you know
• Quantity required, the condition you can accept, and your need-by date

We do not need a purchase order to answer an identification question. Send the number and the photograph and we will tell you what we can establish.

Related

Questions we get on this number

Availability and quote