Mersen USA Ep · Electronic Components
A4BY1200
Fuse, Cartridge
Part NumberA4BY1200
ManufacturerMersen USA Ep
AvailabilityAvailable to order — request a quote
Specifications
NSN5920-00-204-8101 (NSN)
Federal Item NameFUSE,CARTRIDGE
Federal Supply Class5920 — Fuses and Lightning Arresters
Overall Length10.750 INCHES NOMINAL
Terminal Thickness0.375 INCHES NOMINAL
Precious MaterialSILVER
Maximum Voltage Rating In Volts600.0 AC AND 600.0 DC
Interruption Indicator MethodOPAQUE BODY
Center To Center Distance Between9.375 INCHES NOMINAL
Mounting Hole Diameter0.625 INCHES NOMINAL
Features ProvidedNONRENEWABLE FUSIBLE ELEMENT
Overall Diameter2.500 INCHES NOMINAL
Circuit Over Current InterruptionNORMAL INSTANTANEOUS
Precious Material And LocationTERMINAL SURFACES SILVER
Vendor Part NumbersKTU1200
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 A4BY1200 available?
We can source A4BY1200 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 A4BY1200 by Mersen USA Ep obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If A4BY1200 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 A4BY1200?
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 A4BY1200?
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.