Square D · Electronic Components
QOB240
MINIATURE CIRCUIT BREAKER 120/240V 40A
Part NumberQOB240
ManufacturerSquare D
AvailabilityAvailable to order — request a quote
Specifications
NSN5925-00-062-3744 (NSN)
Additional NSNs5925-01-574-6054
Federal Item NameCIRCUIT BREAKER
MaterialPLASTIC CASE
Terminals2 CLIP AND 2 SCREW
Body StyleMULTIPOLE-SINGLE ACTUATOR TYPE
Body Height2.750 INCHES NOMINAL
Actuator FunctionTRIP-RESET
Mounting Facility Type And Quantit4 TERMINAL
Fragility FactorMODERATELY RUGGED
Boss Height0.156 INCHES NOMINAL
Pole Quantity2
Center To Center Distance Between0.734 INCHES NOMINAL
Federal Supply Class5925 — Circuit Breakers
Storage TypeGENERAL PURPOSE WAREHOUSE
Terminal Type And Quantity2 CLIP AND 2 SCREW
Inclosure Protection Type For WhicFUNGUS RESISTANT
Trip Delay Time In Seconds Per Rat240.000 MAXIMUM AT 200 PCT ALL LOCATIONS
Operating Voltage Type And Rating240.0 AC ALL LOCATIONS
ESD/EMICode A — ESD/EMI sensitive item
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 QOB240 available?
We can source QOB240 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 QOB240 by Square D obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If QOB240 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 QOB240?
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 QOB240?
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.