Entron Industries Limited Partnership · Electronic Components
21S5
Switch, Thermostatic
Part Number21S5
ManufacturerEntron Industries Limited Partnership
AvailabilityAvailable to order — request a quote
Specifications
NSN5930-00-244-8959 (NSN)
Federal Item NameSWITCH,THERMOSTATIC
Federal Supply Class5930 — Switches
Mounting Facility PatternTWO POSITION IN-LINE
Overall Length1.125 INCHES NOMINAL
Unthreaded Mounting Hole Diameter0.147 INCHES NOMINAL
Distance Between Mounting Facility0.875 INCHES NOMINAL
Body Diameter0.660 INCHES NOMINAL
Mounting MethodBRACKET(S) AND UNTHREADED HOLE(S)
Style DesignatorDISC W/FLANGE
Contact Voltage Rating In Volts125.0 AC AT SEA LEVEL SINGLE VOLTAGE
Contact AdjustabilityDEACTUATION POINT NOT ADJUSTABLE AND ACTUATION POINT NOT ADJUSTABLE
Frequency In Hertz60.0 SINGLE VOLTAGE
Media For Which DesignedGAS OR LIQUID
Vendor Part Numbers4210E31
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 21S5 available?
We can source 21S5 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 21S5 by Entron Industries Limited Partnership obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 21S5 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 21S5?
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 21S5?
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.