PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21-578Relay,electromagnetic

Te Connectivity Corporation · NSN 5945-01-186-6194 · FSC 5945 · No Item Name Available
Verified by PartsTable
NSN 5945-01-186-6194 — this item is cataloged by the U.S. Government under National Stock Number 5945-01-186-6194. Primary manufacturer part number: 21-578.
Features
  • Relay,electromagnetic — FSC 5945
  • Frequency in Hertz: 50.0 NOMINAL OR 400.0 NOMINAL
  • Main Contact Maximum Voltage Rating in Volts: 120.0 AC AND 30.0 DC
  • Winding Quantity: 1
  • Environmental Protection: SHOCK RESISTANT AND HERMETIC
  • Duty Type: CONTINUOUS
  • Center to Center Distance Between Mounting Facilities Parallel to Length: 3.500 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
  • Unthreaded Mounting Hole Diameter: 0.172 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
Applications
  • Circuit control and protection
  • Equipment power management
  • Signal routing
General Description

The Relay,electromagnetic, cataloged under National Stock Number 5945-01-186-6194, 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 15 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5945-01-186-6194
Primary Part Number21-578
Item NameRelay,electromagnetic
FSC / FSG5945 / 59 — No Item Name Available
ManufacturerTe Connectivity Corporation
StatusACTIVE
Frequency in Hertz50.0 NOMINAL OR 400.0 NOMINAL
Main Contact Maximum Voltage Rating in Volts120.0 AC AND 30.0 DC
Winding Quantity1
Environmental ProtectionSHOCK RESISTANT AND HERMETIC
Duty TypeCONTINUOUS
Center to Center Distance Between Mounting Facilities Parallel to Length3.500 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
Unthreaded Mounting Hole Diameter0.172 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
Terminal Type and Quantity6 THREADED STUD ALL FUNCTIONS
Mounting Facility Type and Quantity4 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY
Nonpile-Up Main Contact Arrangement1 POLE, SINGLE THROW, NORMALLY OPEN, MOMENTARY ACTION AND 1 POLE, SINGLE THROW, NORMALLY CLOSED, MOMENTARY ACTION
Coil Quantity1
Operating Voltage Rating and Type at Specified Temp120.0 VOLTS AC 25 DEG CELSIUS SINGLE WINDING
Main Contact Load Current Rating at Maximum Rated Voltage10.0 AMPERES AC AND 10.0 AMPERES DC RESISTIVE LOAD
Center to Center Distance Between Mounting Facilities Parallel to Width2.750 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
Mounting Facility PatternRECTANGULAR SINGLE MOUNTING FACILITY
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
4320-00-930-518921578 INTERCHANGEABLE
Diffuser
Itt Marlow a Unit of Itt Pumps and Compressors Div
6150-01-096-240021578 INTERCHANGEABLE
Wiring Harness,branched
Smiths Aerospace, Inc., Electronic Systems-Grand Rapids
2990-01-218-201021578 INTERCHANGEABLE
Arrester,spark Exhaust
Walker Mfg Co
1650-01-496-951921578-1 INTERCHANGEABLE
Filtering Disk,fluid
Nuspace, Inc
Cross-Reference Index
Part NumberManufacturer
21-578 PRIMARY Te Connectivity Corporation (USA)
5945PL0921435 Jednolity Indeks Materialowy - Uniform Material Index (POL)
400SX Te Connectivity Corporation (USA)
400SX Pd&e Electronics, Llc (USA)
Related Parts
4320-00-930-5189INTERCHANGEABLE
DIFFUSER
21578
6150-01-096-2400INTERCHANGEABLE
WIRING HARNESS,BRANCHED
21578
2990-01-218-2010INTERCHANGEABLE
ARRESTER,SPARK EXHAUST
21578
1650-01-496-9519INTERCHANGEABLE
FILTERING DISK,FLUID
21578-1

Frequently Asked Questions

What is NSN 5945-01-186-6194?

NSN 5945-01-186-6194 is a Relay,electromagnetic, manufactured by Te Connectivity Corporation, classified under FSC 5945 (No Item Name Available). Status: active.

What are the part numbers for NSN 5945-01-186-6194?

NSN 5945-01-186-6194 has 4 cross-referenced part numbers: 21-578 (Te Connectivity Corporation), 5945PL0921435 (Jednolity Indeks Materialowy - Uniform Material Index), 400SX (Te Connectivity Corporation), 400SX (Pd&e Electronics, Llc).

What NSN replaces 5945-01-186-6194?

There are 4 known substitutes for 5945-01-186-6194: 4320-00-930-5189, 6150-01-096-2400, 2990-01-218-2010 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21-578?

Key specifications for 21-578: Overall Length: 3.876 INCHES NOMINAL IN; Special Features: SCREW DROP-OUT TRIP ADJUSTMENT; Frequency in Hertz: 50.0 NOMINAL OR 400.0 NOMINAL; Main Contact Maximum Voltage Rating in Volts: 120.0 AC AND 30.0 DC. 19 total characteristics are documented in the Federal Logistics Information System.

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