Captor · Electronic Components
A4991
Filter, Radio Frequency Interfere
Part NumberA4991
ManufacturerCaptor
AvailabilityAvailable to order — request a quote
Specifications
NSN5915-01-277-6039 (NSN)
Federal Item NameFILTER,RADIO FREQUENCY INTERFERE
Federal Supply Class5915 — Filters and Networks
Operating Current Rating Per Funct15.0 2ND RADIO INTERFERENCE SECOND FUNCTION
Unthreaded Mounting Hole Diameter0.200 INCHES MINIMUM AND 0.206 INCHES MAXIMUM
Body Height3.720 INCHES MINIMUM AND 3.780 INCHES MAXIMUM
Overall Length9.770 INCHES MINIMUM AND 10.230 INCHES MAXIMUM
Source Impedance Rating Per Functi50.0 OHMS 2ND RADIO INTERFERENCE SECOND FUNCTION
Nominal Thread Size0.190 INCHES
Operating Voltage Rating And Type480.0 VOLTS AC 1ST RADIO INTERFERENCE FIRST FUNCTION
Power Line Frequency Rating Per Fu60.0 2ND RADIO INTERFERENCE SECOND FUNCTION
Load Impedance Per Function50.0 OHMS 1ST RADIO INTERFERENCE FIRST FUNCTION
Mounting Facility Type And Quantit6 THREADED HOLE(S) SECOND FUNCTION
Functional Terminal Type And Quant3 THREADED STUD INPUT FIRST FUNCTION
Output Connection TypeTERMINAL STRIP SINGLE POWER OUTPUT
Output Current Rating11.0 DC AMPERES NOMINAL SINGLE POWER OUTPUT
Input Connection Quantity2 SINGLE OPERATING POWER RQMT
Features ProvidedGROUND WIRE TERMINAL AND VOLTAGE ADJUSTMENT
Input Connection TypeTERMINAL STRIP SINGLE OPERATING POWER RQMT
Input Frequency Rating47.0 HERTZ MINIMUM AND 440.0 HERTZ MAXIMUM SINGLE OPERATING POWER RQMT
Output Connection Quantity2 SINGLE POWER OUTPUT
Output Voltage Rating27.5 DC VOLTS MINIMUM AND 28.5 DC VOLTS MAXIMUM SINGLE POWER OUTPUT
Input Voltage Rating115.0 AC VOLTS NOMINAL FIRST ALTERNATE OPERATING POWER RQMT
Input PhaseSINGLE SINGLE OPERATING POWER RQMT
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 A4991 available?
We can source A4991 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 A4991 by Captor obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If A4991 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 A4991?
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 A4991?
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.