Lockheed Martin Services · Electronic Components
7939139-1
Circuit Breaker
Part Number7939139-1
ManufacturerLockheed Martin Services
AvailabilityAvailable to order — request a quote
Specifications
NSN5925-01-242-8721 (NSN)
Federal Item NameCIRCUIT BREAKER
Federal Supply Class5925 — Circuit Breakers
Body StyleMULTIPOLE-MULTIPLE ACTUATOR TYPE
Internal Trip Release ConfiguratioSERIES TRIP FOURTH LOCATION
Distance Between Centerlines Of Mo0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM
Boss Height0.130 INCHES MINIMUM AND 0.150 INCHES MAXIMUM
Center To Center Distance Between0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM
Fragility FactorMODERATELY RUGGED
Mounting Facility Type And Quantit8 THREADED HOLE(S)
Mounting Surface To Terminal End D2.461 INCHES MINIMUM AND 2.481 INCHES MAXIMUM
Arc Quenching MethodMAGNETIC BLOWOUT
Thread Quantity Per Inch32
Storage TypeGENERAL PURPOSE WAREHOUSE
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 7939139-1 available?
We can source 7939139-1 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 7939139-1 by Lockheed Martin Services obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 7939139-1 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 7939139-1?
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 7939139-1?
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.