MIL-SPEC · Electronic Components
20SR3B4
Switch, Rotary
Part Number20SR3B4
ManufacturerMIL-SPEC
AvailabilityAvailable to order — request a quote
Specifications
NSN5930-00-548-7944 (NSN)
Federal Item NameSWITCH,ROTARY
Federal Supply Class5930 — Switches
Overall Height9.500 INCHES NOMINAL
Overall Width6.750 INCHES NOMINAL
Features ProvidedMETALLIC ENCLOSURE
Unthreaded Mounting Hole Diameter0.500 INCHES NOMINAL SINGLE MOUNTING FACILITY
Longest Horizontal Distance Betwee8.000 INCHES NOMINAL SINGLE MOUNTING FACILITY
Contact Load Current Rating200.0 AMPERES RESISTIVE LOAD DC AT SEA LEVEL
Hazardous Locations EnvironmentalDUSTPROOF
Longest Vertical Distance Between3.250 INCHES NOMINAL SINGLE MOUNTING FACILITY
Shaft Length0.625 INCHES NOMINAL SINGLE ACTUATOR
Shaft TypeROUND SINGLE ACTUATOR
Individual Section Quantity6
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 20SR3B4 available?
We can source 20SR3B4 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 20SR3B4 by MIL-SPEC obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 20SR3B4 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 20SR3B4?
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 20SR3B4?
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.