Northrop Grumman Systems Corporation · Electronic Components
637-278
Transformer, Power
Part Number637-278
ManufacturerNorthrop Grumman Systems Corporation
AvailabilityAvailable to order — request a quote
Specifications
NSN5950-00-909-9146 (NSN)
Federal Item NameTRANSFORMER,POWER
Federal Supply Class5950 — Coils and Transformers
Mounting Facility Quantity4 SINGLE GROUP
Reliability IndicatorNOT ESTABLISHED
Center To Center Distance Between2.688 INCHES MINIMUM AND 2.782 INCHES MAXIMUM SINGLE MOUNTING FACILITY SINGLE CENTER GROUP
Mounting Slot Width0.203 INCHES MINIMUM AND 0.235 INCHES MAXIMUM SINGLE GROUP
Winding Power Rating150.0 VOLTS-AMPERES SINGLE COMPONENT SINGLE SECONDARY
Body Length3.953 INCHES MINIMUM AND 3.985 INCHES MAXIMUM
Body Width3.234 INCHES MINIMUM AND 3.266 INCHES MAXIMUM
Winding Operating Current6.2 AMPERES AC MAXIMUM SINGLE COMPONENT SINGLE SECONDARY
Body Height4.109 INCHES MINIMUM AND 4.141 INCHES MAXIMUM
Winding Operating Voltage240.00 AC VOLTS NOMINAL SINGLE COMPONENT ALL PRIMARY
Frequency Rating50.0 HERTZ NOMINAL OR 60.0 HERTZ NOMINAL 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 637-278 available?
We can source 637-278 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 637-278 by Northrop Grumman Systems Corporation obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 637-278 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 637-278?
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 637-278?
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.