Mersen USA PTT · Electronic Components
A4BT300
Fuse, Cartridge
Part NumberA4BT300
ManufacturerMersen USA PTT
AvailabilityAvailable to order — request a quote
Specifications
NSN5920-01-680-9754 (NSN)
Federal Item NameFUSE,CARTRIDGE
Federal Supply Class5920 — Fuses and Lightning Arresters
Body Length3.8125 INCHES NOMINAL
Body StyleHOLE TYPE
Overall Length219.0 MILLIMETERS NOMINAL
Continuous Current Rating In Amps300.0
Terminal Length61.0 MILLIMETERS NOMINAL
Overall Diameter51.0 MILLIMETERS NOMINAL
Circuit Over Current InterruptionTIME DELAY
Maximum Voltage Rating In Volts500.0 DC AND 600.0 AC
Terminal Thickness8.0 MILLIMETERS NOMINAL
ESD/EMICode A — ESD/EMI sensitive item
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 A4BT300 available?
We can source A4BT300 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 A4BT300 by Mersen USA PTT obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If A4BT300 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 A4BT300?
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 A4BT300?
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.