Master Control Systems Inc. · Electronic Components
B300791
Circuit Breaker
Part NumberB300791
ManufacturerMaster Control Systems Inc.
AvailabilityAvailable to order — request a quote
Specifications
NSN5925-01-021-3784 (NSN)
Federal Item NameCIRCUIT BREAKER
Federal Supply Class5925 — Circuit Breakers
Trip Release MethodTHERMAL SINGLE LOCATION
Trip Release CharacteristicTIME DELAY SINGLE LOCATION
Reset MethodMANUAL
Ultimate Trip Rating Of Continuous145.0 SINGLE LOCATION
Operating Voltage Type And Rating250.0 AC AND 50.0 DC SINGLE LOCATION
Maximum Interrupting Capacity Curr1000.0 AC AND 1000.0 DC SINGLE LOCATION
Maximum Continuous Load Current Ra1.0 AMPERES AC AND 1.0 AMPERES DC SINGLE LOCATION
Circuit Protection TypeOVERCURRENT SINGLE LOCATION
Main Contact Tripping Mechanism TyTRIP FREE
Manual Actuator Type And Quantity1 PUSH BUTTON
Actuator Position DesignationAT POLE ONE
Vendor Part NumbersW58XB1A4A-1
Cancelled NSN5925-01-239-3905 (cancelled)
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 B300791 available?
We can source B300791 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 B300791 by Master Control Systems Inc. obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If B300791 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 B300791?
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 B300791?
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.