Bussmann · Electronic Components
BK/ETF-4
FUSE 4A 250V T-LAG MICRO IEC
Part NumberBK/ETF-4
ManufacturerBussmann
AvailabilityAvailable to order — request a quote
Specifications
NSN5920-01-533-7859 (NSN)
Federal Item NameFUSE,CARTRIDGE
Overall Length12.5 MILLIMETERS NOMINAL
Overall Diameter8.3 MILLIMETERS NOMINAL
Body StylePLUG-IN TYPE
Features ProvidedNONRENEWABLE FUSIBLE ELEMENT
Circuit Over Current InterruptionTIME DELAY
Body Length7.7 MILLIMETERS NOMINAL
Terminal Length4.8 MILLIMETERS NOMINAL
Maximum Voltage Rating In Volts250.0 AC
Center To Center Distance Between5.0 MILLIMETERS NOMINAL
Terminal Diameter0.4 MILLIMETERS NOMINAL
Federal Supply Class5920 — Fuses, Arrestors, Absorbers, And Protectors
Continuous Current Rating In Amps4.000
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 BK/ETF-4 available?
We can source BK/ETF-4 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 BK/ETF-4 by Bussmann obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If BK/ETF-4 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 BK/ETF-4?
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 BK/ETF-4?
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.