PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4791Relay,electromagnetic

Hydro-Aire Aerospace Corp · NSN 5945-00-539-2955 · FSC 5945 · No Item Name Available
Verified by PartsTable
NSN 5945-00-539-2955 — this item is cataloged by the U.S. Government under National Stock Number 5945-00-539-2955. Primary manufacturer part number: 4791.
Features
  • Relay,electromagnetic — FSC 5945
  • Thread Quantity Per Inch: 32 SINGLE MOUNTING FACILITY
  • Duty Type: CONTINUOUS
  • Main Contact Maximum Voltage Rating in Volts: 29.0 DC
  • Nominal Thread Size: 0.138 INCHES SINGLE MOUNTING FACILITY IN
  • Main Contact Load Current Rating at Maximum Rated Voltage: 6.0 AMPERES DC RESISTIVE LOAD
  • Thread Class: 2B SINGLE MOUNTING FACILITY
  • Operating Voltage Rating and Type at Specified Temp: 24.0 VOLTS DC 25 DEG CELSIUS SINGLE WINDING
Applications
  • Circuit control and protection
  • Equipment power management
  • Signal routing
General Description

The Relay,electromagnetic, cataloged under National Stock Number 5945-00-539-2955, is classified within Federal Supply Class 5945 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Hydro-Aire Aerospace Corp. Government technical data includes 14 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5945-00-539-2955
Primary Part Number4791
Item NameRelay,electromagnetic
FSC / FSG5945 / 59 — No Item Name Available
ManufacturerHydro-Aire Aerospace Corp
StatusCANCELLED
Thread Quantity Per Inch32 SINGLE MOUNTING FACILITY
Duty TypeCONTINUOUS
Main Contact Maximum Voltage Rating in Volts29.0 DC
Nominal Thread Size0.138 INCHES SINGLE MOUNTING FACILITY IN
Main Contact Load Current Rating at Maximum Rated Voltage6.0 AMPERES DC RESISTIVE LOAD
Thread Class2B SINGLE MOUNTING FACILITY
Operating Voltage Rating and Type at Specified Temp24.0 VOLTS DC 25 DEG CELSIUS SINGLE WINDING
Coil Quantity1
Terminal Type and Quantity8 PIN ALL FUNCTIONS
Nonpile-Up Main Contact Arrangement2 POLE, DOUBLE THROW, ONE POSITION MOMENTARY
Winding Quantity1
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC) SINGLE MOUNTING FACILITY
Mounting Facility Type and Quantity1 THREADED HOLE(S) SINGLE MOUNTING FACILITY
Winding DC Resistance Rating150.0 OHMS MINIMUM AND 500.0 OHMS MAXIMUM SINGLE WINDING
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
5365-00-035-454120388 INTERCHANGEABLE
Plug Retaining
Northrop Grumman Systems Corp Dba Northrop Grumman Systems Corp
3110-00-100-6155MS19059-2418 INTERCHANGEABLE
Ball,bearing
American Society for Testing and Materials Dba Astm International
5360-00-135-6449 INTERCHANGEABLE
Spring
3130-00-715-807020388 INTERCHANGEABLE
Bearing Unit,plain
Alfa Laval Niagara Inc.
5985-01-023-31604791 INTERCHANGEABLE
Attenuator,variable
Narda Holdings, Inc. Dba Narda-Miteq Div Narda-Miteq
5950-01-045-16944791 INTERCHANGEABLE
Transformer,power
A M I/ Coast Magnetics Inc. Dba Coast Magnetics
4730-01-148-9439 INTERCHANGEABLE
Plug,cleanout
6105-01-155-497620388 INTERCHANGEABLE
Motor,alternating Current
Scott and Fetzer Co the Wayne Home Equipment Div
3040-01-292-1590SA-2676 INTERCHANGEABLE
Shaft,shouldered
Woodward Controls Inc.
3040-01-315-335220388-1 INTERCHANGEABLE
Hub,body
United States Department of the Navy Dba Naval Surface Warfare Center Panama City
Cross-Reference Index
Part NumberManufacturer
4791 Hydro-Aire Aerospace Corp (USA)
20-388 Lockheed Electronics Co Inc Information Engineering Div (USA)
Related Parts
5365-00-035-4541INTERCHANGEABLE
PLUG RETAINING
20388
3110-00-100-6155INTERCHANGEABLE
BALL,BEARING
MS19059-2418
5360-00-135-6449INTERCHANGEABLE
SPRING
3130-00-715-8070INTERCHANGEABLE
BEARING UNIT,PLAIN
20388
5985-01-023-3160INTERCHANGEABLE
ATTENUATOR,VARIABLE
4791
5950-01-045-1694INTERCHANGEABLE
TRANSFORMER,POWER
4791
4730-01-148-9439INTERCHANGEABLE
PLUG,CLEANOUT
6105-01-155-4976INTERCHANGEABLE
MOTOR,ALTERNATING CURRENT
20388
3040-01-292-1590INTERCHANGEABLE
SHAFT,SHOULDERED
SA-2676
3040-01-315-3352INTERCHANGEABLE
HUB,BODY
20388-1
6510-01-315-8450INTERCHANGEABLE
BANDAGE,CAST,IMPREGNATED
5950-01-342-4274INTERCHANGEABLE
COIL ASSEMBLY,ELECTRICAL
4791

Frequently Asked Questions

What is NSN 5945-00-539-2955?

NSN 5945-00-539-2955 is a Relay,electromagnetic, manufactured by Hydro-Aire Aerospace Corp, classified under FSC 5945 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5945-00-539-2955?

NSN 5945-00-539-2955 has 2 cross-referenced part numbers: 4791 (Hydro-Aire Aerospace Corp), 20-388 (Lockheed Electronics Co Inc Information Engineering Div).

What NSN replaces 5945-00-539-2955?

There are 12 known substitutes for 5945-00-539-2955: 5365-00-035-4541, 3110-00-100-6155, 5360-00-135-6449 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 4791?

Key specifications for 4791: Thread Quantity Per Inch: 32 SINGLE MOUNTING FACILITY; Duty Type: CONTINUOUS; Overall Length: 1.930 INCHES NOMINAL IN; Main Contact Maximum Voltage Rating in Volts: 29.0 DC. 17 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5945-00-539-2955 still in active supply?

NSN 5945-00-539-2955 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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