Electro Switch Corp. · Electronic Components
123903MB
Switch, Rotary
Part Number123903MB
ManufacturerElectro Switch Corp.
AvailabilityAvailable to order — request a quote
Specifications
NSN5930-01-317-3882 (NSN)
Federal Item NameSWITCH,ROTARY
Federal Supply Class5930 — Switches
Mounting Facility PatternFOUR POSITION CIRCULAR SINGLE MOUNTING FACILITY
Thread Class2B SINGLE MOUNTING FACILITY
Mounting Facility Circle Radius1.610 INCHES NOMINAL SINGLE MOUNTING FACILITY
Overall Length4.688 INCHES NOMINAL
Thread Quantity Per Inch20 SINGLE MOUNTING FACILITY
Switch Actuator Indexing Position4 SINGLE ACTUATOR
Overall Width3.812 INCHES NOMINAL
Contact Load Current Rating30.0 AMPERES RESISTIVE LOAD AC AT SEA LEVEL
Mounting MethodBRACKET(S) AND THREADED HOLE(S) SINGLE MOUNTING FACILITY
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC) SINGLE MOUNTING FACILITY
Nominal Thread Size0.250 INCHES SINGLE MOUNTING FACILITY
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 123903MB available?
We can source 123903MB 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 123903MB by Electro Switch Corp. obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 123903MB 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 123903MB?
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 123903MB?
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.