Superior Electric Holding Group LLC · Electronic Components
5-1257
Transformer, Power Autotransforme
Part Number5-1257
ManufacturerSuperior Electric Holding Group LLC
AvailabilityAvailable to order — request a quote
Specifications
NSN5950-00-690-0365 (NSN)
Federal Item NameTRANSFORMER,POWER AUTOTRANSFORME
Federal Supply Class5950 — Coils and Transformers
Reliability IndicatorNOT ESTABLISHED
Body Length3.312 INCHES NOMINAL
Nominal Thread Size0.375 INCHES SINGLE GROUP
Input Output Phase RelationshipSINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
Thread Quantity Per Inch32 SINGLE GROUP
Inclosure TypeFULLY INCLOSED
Terminal Type And Quantity3 THREADED STUD
Winding Power Rating70.0 VOLTS-AMPERES SINGLE COMPONENT SINGLE PRIMARY OUTPUT
Mounting MethodTHREADED BUSHING SINGLE GROUP
Body Outside Diameter1.812 INCHES NOMINAL
Winding Operating Voltage115.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY INPUT
Cancelled NSN5910-01-053-7638 (cancelled)
Frequency Rating400.0 HERTZ MINIMUM AND 800.0 HERTZ MAXIMUM SINGLE COMPONENT
Mounting Hole Diameter0.375 INCHES NOMINAL SINGLE GROUP
Mounting Facility Quantity1 SINGLE GROUP
Winding Function And Quantity2 PRIMARY, FIXED AUTOTRANSFORMER TYPE SINGLE COMPONENT
Vendor Part Numbers2-1257, 68400151004, 737118-01
RH Electronics, Inc. — independent stocking distributor since 1982.
Every shipment inspected on receipt · ISO 9001:2015 · ANSI/ESD S20.20 · ERAI member since 1998 · GIDEP participant
Every shipment inspected on receipt · ISO 9001:2015 · ANSI/ESD S20.20 · ERAI member since 1998 · GIDEP participant
Frequently asked
Is 5-1257 available?
We can source 5-1257 even if it isn't in our active stock list. As an independent distributor we reach inventory outside the franchise channel — including hard-to-find and obsolete parts. Send us a quote request.
Is 5-1257 by Superior Electric Holding Group LLC obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 5-1257 has been discontinued, we can often source remaining stock or qualified alternates. Contact us with your quantity and target date.
How does RH Electronics verify parts like 5-1257?
Every incoming shipment is inspected under our ISO 9001:2015 quality system — documentation, markings, and construction checked against known-good references. For deeper analysis, we direct work through accredited independent labs. We've been an ERAI member since 1998 and a GIDEP participant.
Can you find a cross-reference or alternate for 5-1257?
Yes. Our team reads part numbers the way they were designed — decoding family, speed, temperature grade, package, and reliability level — to identify acceptable alternates when the exact part isn't available. Submit a quote request and we'll advise.