Westinghouse Electric Corp. · Electronic Components
121B
Resistor, Current Regulating
Part Number121B
ManufacturerWestinghouse Electric Corp.
AvailabilityAvailable to order — request a quote
Specifications
NSN5905-00-665-2215 (NSN)
Federal Item NameRESISTOR,CURRENT REGULATING
Federal Supply Class5905 — Resistors
Threshold Voltage In Volts5.5
Base Type4 PIN
Envelope Type Per Mil E 1NOT APPLICABLE
Current Range In Amps+0.765 TO 0.965
Current TypeAC/DC
Resistive Element Pin Connection1 AND 4
Output Voltage Rating0.0 AC VOLTS MINIMUM AND 260.0 AC VOLTS MAXIMUM FIRST POWER OUTPUT
Input Voltage Rating115.0 AC VOLTS NOMINAL SECOND ALTERNATE OPERATING POWER RQMT
Output Current Rating0.5 AC AMPERES NOMINAL FIRST POWER OUTPUT
Overall Height3.500 INCHES NOMINAL
Input PhaseSINGLE SINGLE OPERATING POWER RQMT
Electrical Power Source RelationshOPERATING
Output PhaseSINGLE SINGLE POWER OUTPUT
Overall Length15.000 INCHES NOMINAL
Output Frequency Rating45.0 HERTZ MINIMUM AND 5.0 KILOHERTZ MAXIMUM SINGLE POWER OUTPUT
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 121B available?
We can source 121B 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 121B by Westinghouse Electric Corp. obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 121B 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 121B?
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 121B?
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.