MIL-SPEC · Electronic Components
M55629/21FNFN
Circuit Breaker
Part NumberM55629/21FNFN
ManufacturerMIL-SPEC
AvailabilityAvailable to order — request a quote
Specifications
NSN5925-01-295-0612 (NSN)
Federal Item NameCIRCUIT BREAKER
Federal Supply Class5925 — Circuit Breakers
Body Length1.969 INCHES MINIMUM AND 2.031 INCHES MAXIMUM
Trip Delay Time In Seconds Per Rat0.160 MINIMUM AT 200 PCT AND 1.600 MAXIMUM AT 200 PCT ALL LOCATIONS
Switch Location And Position DesigINTERNAL AT POLE ONE
Mounting Facility Type And Quantit1 THREADED BUSHING WITH PANEL SEAL
Nonturn Device Radius0.641 INCHES MINIMUM AND 0.671 INCHES MAXIMUM
Nonturn Device Length0.115 INCHES MINIMUM AND 0.145 INCHES MAXIMUM
Mounting Surface To Terminal End D2.232 INCHES MAXIMUM
Thread Quantity Per Inch32
Special Handling FeatureMAGNETIC
Nonturn Device Diameter0.138 INCHES NOMINAL
Fragility FactorMODERATELY RUGGED
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 M55629/21FNFN available?
We can source M55629/21FNFN 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 M55629/21FNFN by MIL-SPEC obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If M55629/21FNFN 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 M55629/21FNFN?
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 M55629/21FNFN?
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.