Ranco Inc. Ranco Controls Div · Electronic Components
TRM3221
Switch, Thermostatic
Part NumberTRM3221
ManufacturerRanco Inc. Ranco Controls Div
AvailabilityAvailable to order — request a quote
Specifications
NSN5930-00-349-7017 (NSN)
Federal Item NameSWITCH,THERMOSTATIC
Federal Supply Class5930 — Switches
Contact Action StimulusINCREASE
Temp Sensing Element TypeCAPILLARY TUBE-BULB
Overall Width2.781 INCHES NOMINAL
Overall Length3.312 INCHES NOMINAL
Contact Load Current Rating4.6 AMPERES RESISTIVE LOAD FIRST VOLTAGE
Contact Voltage Rating In Volts120.0 DC AT SEA LEVEL SECOND VOLTAGE
Contact Stimulus Rating2.00 DIFFERENTIAL POINT NOMINAL DEGREES FAHRENHEIT
Contact Adjustment TypeEXTERNAL ACTUATION POINT KNOB
Contact Adjustment Range+50.00 TO 250.00 ACTUATION POINT DEGREES FAHRENHEIT
Contact AdjustabilityACTUATION POINT ADJUSTABLE, PRESET
Capillary Tube Length72.000 INCHES NOMINAL
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 TRM3221 available?
We can source TRM3221 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 TRM3221 by Ranco Inc. Ranco Controls Div obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If TRM3221 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 TRM3221?
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 TRM3221?
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.