Ballantine Laboratories Inc. · Electronic Components
MB521C
Transformer, Power
Part NumberMB521C
ManufacturerBallantine Laboratories Inc.
AvailabilityAvailable to order — request a quote
Specifications
NSN5950-00-688-7285 (NSN)
Federal Item NameTRANSFORMER,POWER
Federal Supply Class5950 — Coils and Transformers
Reliability IndicatorNOT ESTABLISHED
Winding Operating Voltage680.00 AC VOLTS NOMINAL SINGLE COMPONENT SECOND SECONDARY
Body Length3.000 INCHES NOMINAL
Mounting MethodTHREADED STUD(S) SINGLE GROUP
Center To Center Distance Between2.500 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP
Mounting Facility Quantity4 SINGLE GROUP
Winding Operating Current1.2 AMPERES AC MAXIMUM SINGLE COMPONENT FIRST SECONDARY
Frequency Rating50.0 HERTZ MINIMUM AND 420.0 HERTZ MAXIMUM SINGLE COMPONENT
Winding Function And Quantity2 PRIMARY AND 3 SECONDARY SINGLE COMPONENT
Inclosure TypeFULLY INCLOSED
Input Output Phase RelationshipSINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
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 MB521C available?
We can source MB521C 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 MB521C by Ballantine Laboratories Inc. obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If MB521C 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 MB521C?
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 MB521C?
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.