National Oil Well · Electronic Components
21538
Absorber, Overvoltage
Part Number21538
ManufacturerNational Oil Well
AvailabilityAvailable to order — request a quote
Specifications
NSN5920-01-276-8831 (NSN)
Federal Item NameABSORBER,OVERVOLTAGE
Federal Supply Class5920 — Fuses and Lightning Arresters
Vendor Part NumbersSDI4200-12, SD-4200-12
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 21538 available?
We can source 21538 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 21538 by National Oil Well obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 21538 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 21538?
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 21538?
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.