Square D · Electronic Components
QOB340
MINIATURE CIRCUIT BREAKER 240V 40A
Part NumberQOB340
ManufacturerSquare D
AvailabilityAvailable to order — request a quote
Specifications
NSN5925-00-785-4251 (NSN)
Federal Item NameCIRCUIT BREAKER
MaterialPLASTIC CASE
Terminals3 CLIP AND 3 COMPRESSION
Body StyleMULTIPOLE-SINGLE ACTUATOR TYPE
Reset MethodMANUAL
Circuit Protection TypeOVERCURRENT ALL LOCATIONS
Maximum Continuous Load Current Ra40.0 AMPERES AC ALL LOCATIONS
Trip Release CharacteristicINSTANTANEOUS ALL LOCATIONS
Main Contact Tripping Mechanism TyTRIP FREE
Manual Actuator Type And Quantity1 TOGGLE
Frequency In Hertz60.0 ALL LOCATIONS
Federal Supply Class5925 — Circuit Breakers
Mounting Facility Type And Quantit6 TERMINAL
Center To Center Distance Between0.734 INCHES NOMINAL
Terminal Type And Quantity3 CLIP AND 3 COMPRESSION
Storage TypeGENERAL PURPOSE WAREHOUSE
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 QOB340 available?
We can source QOB340 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 QOB340 by Square D obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If QOB340 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 QOB340?
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 QOB340?
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.