PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-R-5757/1Relay,electromagnetic

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5945-00-458-7204 · FSC 5945 · No Item Name Available
Verified by PartsTable
NSN 5945-00-458-7204 — this item is cataloged by the U.S. Government under National Stock Number 5945-00-458-7204. Primary manufacturer part number: MIL-R-5757/1.
Features
  • Relay,electromagnetic — FSC 5945
  • Main Contact Load Current Rating at Maximum Rated Voltage: 300.0 MILLIAMPERES AC AND 1.0 AMPERES DC RESISTIVE LOAD
  • Purpose for Which Designed: GENERAL
  • Coil Quantity: 1
  • Mounting Facility Type and Quantity: 2 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY
  • Test Data Document: 81349-MIL-R-5757 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
  • Terminal Type and Quantity: 20 PIN ALL FUNCTIONS
  • Environmental Protection: HERMETIC
Applications
  • Circuit control and protection
  • Equipment power management
  • Signal routing
General Description

The Relay,electromagnetic, cataloged under National Stock Number 5945-00-458-7204, 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 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 19 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5945-00-458-7204
Primary Part NumberMIL-R-5757/1
Item NameRelay,electromagnetic
FSC / FSG5945 / 59 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusCANCELLED
Main Contact Load Current Rating at Maximum Rated Voltage300.0 MILLIAMPERES AC AND 1.0 AMPERES DC RESISTIVE LOAD
Purpose for Which DesignedGENERAL
Coil Quantity1
Mounting Facility Type and Quantity2 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY
Test Data Document81349-MIL-R-5757 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
Terminal Type and Quantity20 PIN ALL FUNCTIONS
Environmental ProtectionHERMETIC
Winding Quantity1
Unthreaded Mounting Hole Diameter0.152 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
Duty TypeCONTINUOUS
Mounting Facility PatternIN-LINE SINGLE MOUNTING FACILITY
Center to Center Distance Between Mounting Facilities Parallel to Length1.562 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
Operating Voltage Rating and Type at Specified Temp26.5 VOLTS DC 25 DEG CELSIUS SINGLE WINDING
Fragility FactorMODERATELY RUGGED
Storage TypeGENERAL PURPOSE WAREHOUSE
Winding DC Resistance Rating270.0 OHMS MINIMUM AND 330.0 OHMS MAXIMUM SINGLE WINDING
Nonpile-Up Main Contact Arrangement6 POLE, DOUBLE THROW, ONE POSITION MOMENTARY
Specification/standard Data81349-MIL-R-5757/1 GOVERNMENT SPECIFICATION
Main Contact Maximum Voltage Rating in Volts115.0 AC AND 28.0 DC
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 9
5945-00-494-8964 INTERCHANGEABLE
Relay,electromagnetic
5945-00-558-9155 INTERCHANGEABLE
Relay,electromagnetic
5945-00-823-2611 INTERCHANGEABLE
Relay,electromagnetic
5945-00-874-0602 INTERCHANGEABLE
Relay,electromagnetic
5945-00-905-7719 INTERCHANGEABLE
Relay,electromagnetic
5945-01-018-1935A13-4155 INTERCHANGEABLE
Relay,electromagnetic
Dri Relays Inc. Dba Dri Relays Inc
5945-01-062-5154 INTERCHANGEABLE
Relay,electromagnetic
5945-01-159-4902 INTERCHANGEABLE
Relay,electromagnetic
5945-01-178-6832 INTERCHANGEABLE
Relay,electromagnetic
Cross-Reference Index
Part NumberManufacturer
MIL-R-5757/1 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
M5757/1-101 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
5945-00-494-8964INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
5945-00-558-9155INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
5945-00-823-2611INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
5945-00-874-0602INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
5945-00-905-7719INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
5945-01-018-1935INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
A13-4155
5945-01-062-5154INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
5945-01-159-4902INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
5945-01-178-6832INTERCHANGEABLE
RELAY,ELECTROMAGNETIC

Frequently Asked Questions

What is NSN 5945-00-458-7204?

NSN 5945-00-458-7204 is a Relay,electromagnetic, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5945 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5945-00-458-7204?

NSN 5945-00-458-7204 has 2 cross-referenced part numbers: MIL-R-5757/1 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), M5757/1-101 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 5945-00-458-7204?

There are 9 known substitutes for 5945-00-458-7204: 5945-00-494-8964, 5945-00-558-9155, 5945-00-823-2611 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-R-5757/1?

Key specifications for MIL-R-5757/1: Main Contact Load Current Rating at Maximum Rated Voltage: 300.0 MILLIAMPERES AC AND 1.0 AMPERES DC RESISTIVE LOAD; Purpose for Which Designed: GENERAL; Coil Quantity: 1; Mounting Facility Type and Quantity: 2 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY. 22 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5945-00-458-7204 still in active supply?

NSN 5945-00-458-7204 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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