PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21-042ARelay,electromagnetic

Te Connectivity Corporation · NSN 5945-00-346-3642 · FSC 5945 · No Item Name Available
Verified by PartsTable
NSN 5945-00-346-3642 — this item is cataloged by the U.S. Government under National Stock Number 5945-00-346-3642. Primary manufacturer part number: 21-042A.
Features
  • Relay,electromagnetic — FSC 5945
  • Coil Quantity: 2
  • Environmental Protection: HUMIDITY RESISTANT
  • Main Contact Maximum Voltage Rating in Volts: 28.0 DC
  • Frequency in Hertz: 60.0 MINIMUM AND 375.0 MAXIMUM
  • Operating Voltage Rating and Type at Specified Temp: 115.0 VOLTS AC 25 DEG CELSIUS ALL WINDINGS
  • Mounting Facility Type and Quantity: 4 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY
  • Features Provided: POLARIZED
Applications
  • Circuit control and protection
  • Equipment power management
  • Signal routing
General Description

The Relay,electromagnetic, cataloged under National Stock Number 5945-00-346-3642, 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 Te Connectivity Corporation. Government technical data includes 16 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5945-00-346-3642
Primary Part Number21-042A
Item NameRelay,electromagnetic
FSC / FSG5945 / 59 — No Item Name Available
ManufacturerTe Connectivity Corporation
StatusCANCELLED
Coil Quantity2
Environmental ProtectionHUMIDITY RESISTANT
Main Contact Maximum Voltage Rating in Volts28.0 DC
Frequency in Hertz60.0 MINIMUM AND 375.0 MAXIMUM
Operating Voltage Rating and Type at Specified Temp115.0 VOLTS AC 25 DEG CELSIUS ALL WINDINGS
Mounting Facility Type and Quantity4 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY
Features ProvidedPOLARIZED
Unthreaded Mounting Hole Diameter0.196 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
Main Contact Load Current Rating at Maximum Rated Voltage3.0 AMPERES DC RESISTIVE LOAD
Mounting Facility PatternRECTANGULAR SINGLE MOUNTING FACILITY
Center to Center Distance Between Mounting Facilities Parallel to Length3.875 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
Center to Center Distance Between Mounting Facilities Parallel to Width3.500 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
Duty TypeCONTINUOUS
Winding Quantity2
Terminal Type and Quantity7 PIN ALL FUNCTIONS
Nonpile-Up Main Contact Arrangement1 POLE, DOUBLE THROW, ONE POSITION MOMENTARY
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 8
5895-00-531-5438 INTERCHANGEABLE
Power Supply Module
5950-00-679-0519722899-270 INTERCHANGEABLE
Transformer,power Autotransforme
Raytheon Company Div Rmd Strategic
3950-00-928-4255N100712-1 INTERCHANGEABLE
Capstan
Control Flow, Inc. Dba Control Flow Inc
5940-01-023-857910-104-3 INTERCHANGEABLE
Terminal,stud
Concord Electronics, Inc.
5305-01-080-0667 INTERCHANGEABLE
Screw,machine
5950-01-098-9851SM-D-449043 INTERCHANGEABLE
Transformer,radio Frequency
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
5315-01-597-9064 INTERCHANGEABLE
Pin,straight,headless
5915-01-649-7805101043 INTERCHANGEABLE
Filter,low Pass
Q Microwave Inc Dba Q Microwave Inc
Cross-Reference Index
Part NumberManufacturer
21-042A PRIMARY Te Connectivity Corporation (USA)
A846-1 Hobart Bros Co (USA)
SDA846-1 PRIMARY Air Force Lifecycle Management Center Electronic Components (aflcmc/ezss) (USA)
A846-1 Te Connectivity Corporation (USA)
101043 Parko Electronics Company Inc (USA)
Related Parts
5895-00-531-5438INTERCHANGEABLE
POWER SUPPLY MODULE
5950-00-679-0519INTERCHANGEABLE
TRANSFORMER,POWER AUTOTRANSFORME
722899-270
3950-00-928-4255INTERCHANGEABLE
CAPSTAN
N100712-1
5940-01-023-8579INTERCHANGEABLE
TERMINAL,STUD
10-104-3
5305-01-080-0667INTERCHANGEABLE
SCREW,MACHINE
5950-01-098-9851INTERCHANGEABLE
TRANSFORMER,RADIO FREQUENCY
SM-D-449043
5315-01-597-9064INTERCHANGEABLE
PIN,STRAIGHT,HEADLESS
5915-01-649-7805INTERCHANGEABLE
FILTER,LOW PASS
101043

Frequently Asked Questions

What is NSN 5945-00-346-3642?

NSN 5945-00-346-3642 is a Relay,electromagnetic, manufactured by Te Connectivity Corporation, classified under FSC 5945 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5945-00-346-3642?

NSN 5945-00-346-3642 has 5 cross-referenced part numbers: 21-042A (Te Connectivity Corporation), A846-1 (Hobart Bros Co), SDA846-1 (Air Force Lifecycle Management Center Electronic Components (aflcmc/ezss)), A846-1 (Te Connectivity Corporation), 101043 (Parko Electronics Company Inc).

What NSN replaces 5945-00-346-3642?

There are 8 known substitutes for 5945-00-346-3642: 5895-00-531-5438, 5950-00-679-0519, 3950-00-928-4255 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21-042A?

Key specifications for 21-042A: Coil Quantity: 2; Environmental Protection: HUMIDITY RESISTANT; Main Contact Maximum Voltage Rating in Volts: 28.0 DC; Frequency in Hertz: 60.0 MINIMUM AND 375.0 MAXIMUM. 19 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5945-00-346-3642 still in active supply?

NSN 5945-00-346-3642 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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