SUPERIOR ELECTRIC · Electronic Components
21-3
Manual, 3 Deck, Open Construction, 3 Wye, 240V, 5A
Part Number21-3
ManufacturerSUPERIOR ELECTRIC
AvailabilityAvailable to order — request a quote
Specifications
NSN2010-00-256-5463 (NSN)
Additional NSNs4920-01-557-5154, 5950-01-165-2997
Federal Item NameCOUPLING,FLEXIBLE,FLANGED
General Characteristics Item DescrREPAIR PART FOR OUTBOARD DRIVE SHAFT U/O PROPELLING UNIT,OUTBOARD,DIESEL,FSN 2010-410-4442
Federal Supply Class2010 — Ship And Boat Propulsion Components
Overall Length5.250 INCHES NOMINAL
Reliability IndicatorNOT ESTABLISHED
Winding Function And Quantity1 PRIMARY, VARIABLE AUTOTRANSFORMER TYPE SINGLE COMPONENT
Overall Width4.620 INCHES NOMINAL
Winding Operating Voltage240.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY INPUT
Terminal Type And Quantity11 TAB, SOLDER LUG
Transformer Winding Connection TypWYE-WYE
Mounting Facility Quantity4 ALL GROUPINGS
Inclosure TypeOPEN
Mounting MethodTHREADED HOLE(S) SECOND GROUP
Winding Operating Current5.0 AMPERES AC NOMINAL SINGLE COMPONENT SINGLE PRIMARY OUTPUT
Cancelled NSN5950-01-378-1439 (cancelled)
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 21-3 available?
We can source 21-3 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 21-3 by SUPERIOR ELECTRIC obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 21-3 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 21-3?
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 21-3?
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.