Square D · Electronic Components
QOB140
MINIATURE CIRCUIT BREAKER 120/240V 40A
Part NumberQOB140
ManufacturerSquare D
AvailabilityAvailable to order — request a quote
Specifications
NSN5925-00-967-9875 (NSN)
Federal Item NameCIRCUIT BREAKER
MaterialPLASTIC CASE
Terminals1 CLIP AND 1 TAB W/SCREW
Body StyleSINGLE POLE TYPE
Circuit Protection TypeOVERCURRENT SINGLE LOCATION
Main Contact Tripping Mechanism TyTRIP FREE
Trip Release CharacteristicINSTANTANEOUS AND TIME DELAY SINGLE LOCATION
Maximum Continuous Load Current Ra40.0 AMPERES AC SINGLE LOCATION
Operating Voltage Type And Rating120.0 AC SINGLE LOCATION
Maximum Interrupting Capacity Curr5000.0 AC SINGLE LOCATION
Ultimate Trip Rating Of Continuous125.0 SINGLE LOCATION
Federal Supply Class5925 — Circuit Breakers
Reset MethodMANUAL
Trip Release MethodTHERMAL-MAGNETIC SINGLE LOCATION
Boss Height0.250 INCHES NOMINAL
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 QOB140 available?
We can source QOB140 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 QOB140 by Square D obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If QOB140 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 QOB140?
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 QOB140?
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.