MIL-SPEC · Electronic Components
M39019/03-257
Circuit Breaker
Part NumberM39019/03-257
ManufacturerMIL-SPEC
AvailabilityAvailable to order — request a quote
Specifications
NSN5925-01-045-7173 (NSN)
Federal Item NameCIRCUIT BREAKER
Federal Supply Class5925 — Circuit Breakers
Trip Release MethodMAGNETIC ALL LOCATIONSMAGNETIC ALL LOCATIONS
Maximum Interrupting Capacity Curr300.0 AC AND 300.0 AC AND 500.0 DC ALL LOCATIONS500.0 DC ALL LOCATIONS
Reset MethodMANUALMANUAL
Circuit Protection TypeOVERCURRENT ALL LOCATIONSOVERCURRENT ALL LOCATIONS
Main Contact Tripping Mechanism TyTRIP FREETRIP FREE
Maximum Continuous Load Current Ra20.0 AMPERES AC AND 20.0 AMPERES AC AND 20.0 AMPERES DC ALL LOCATIONS20.0 AMPERES DC ALL LOCATIONS
Ultimate Trip Rating Of Continuous125.0 ALL LOCATIONS125.0 ALL LOCATIONS
Trip Release CharacteristicTIME DELAY ALL LOCATIONSTIME DELAY ALL LOCATIONS
Operating Voltage Type And Rating240.0 AC AND 240.0 AC AND 50.0 DC ALL LOCATIONS50.0 DC ALL LOCATIONS
Thread Quantity Per Inch3232
Mounting Surface To Terminal End D1.828 INCHES MAXIMUM1.828 INCHES MAXIMUM
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 M39019/03-257 available?
We can source M39019/03-257 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 M39019/03-257 by MIL-SPEC obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If M39019/03-257 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 M39019/03-257?
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 M39019/03-257?
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.