PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

M5757/40-001Relay,electromagnetic

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5945-00-458-3157 · FSC 5945 · No Item Name Available
Verified by PartsTable
NSN 5945-00-458-3157 — this item is cataloged by the U.S. Government under National Stock Number 5945-00-458-3157. Primary manufacturer part number: M5757/40-001.
Features
  • Relay,electromagnetic — FSC 5945
  • Terminal Type and Quantity: 8 WIRE LEAD ALL FUNCTIONS
  • Coil Quantity: 1
  • Main Contact Load Current Rating at Maximum Rated Voltage: 100.0 MILLIAMPERES DC LAMP LOAD
  • Environmental Protection: HERMETIC
  • Duty Type: CONTINUOUS
  • Winding DC Resistance Rating: 88.2 OHMS MINIMUM AND 108.0 OHMS MAXIMUM SINGLE WINDING
  • Purpose for Which Designed: GENERAL
Applications
  • Circuit control and protection
  • Equipment power management
  • Signal routing
General Description

The Relay,electromagnetic, cataloged under National Stock Number 5945-00-458-3157, 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 20 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5945-00-458-3157
Primary Part NumberM5757/40-001
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
StatusACTIVE
Terminal Type and Quantity8 WIRE LEAD ALL FUNCTIONS
Coil Quantity1
Main Contact Load Current Rating at Maximum Rated Voltage100.0 MILLIAMPERES DC LAMP LOAD
Environmental ProtectionHERMETIC
Duty TypeCONTINUOUS
Winding DC Resistance Rating88.2 OHMS MINIMUM AND 108.0 OHMS MAXIMUM SINGLE WINDING
Purpose for Which DesignedGENERAL
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.).
Storage TypeGENERAL PURPOSE WAREHOUSE
Fragility FactorMODERATELY RUGGED
Main Contact Load Current Rating at Maximum Rated Voltage1.0 AMPERES DC RESISTIVE LOAD
Operating Voltage Rating and Type at Specified Temp6.0 VOLTS DC 25 DEG CELSIUS SINGLE WINDING
Main Contact Maximum Voltage Rating in Volts28.0 DC
Winding Quantity1
Time Delay0.0025 SECONDS MAXIMUM FIXED RELEASE TIME
Overall Diameter0.335 INCHES MAXIMUM IN
Time Delay0.003 SECONDS MAXIMUM FIXED OPERATE TIME
Specification/standard Data81349-MIL-R-5757/40 GOVERNMENT SPECIFICATION
Nonpile-Up Main Contact Arrangement2 POLE, DOUBLE THROW, ONE POSITION MOMENTARY
Mounting Facility Type and Quantity1 TERMINAL SINGLE MOUNTING FACILITY
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
5945-00-136-8399 INTERCHANGEABLE
Relay,electromagnetic
5945-00-253-0239 INTERCHANGEABLE
Relay,electromagnetic
5945-00-403-3905 INTERCHANGEABLE
Relay,electromagnetic
5945-00-405-3906 INTERCHANGEABLE
Relay,electromagnetic
5945-00-435-1184 INTERCHANGEABLE
Relay,electromagnetic
5945-01-117-0523 INTERCHANGEABLE
Relay,electromagnetic
5945-01-117-2546 INTERCHANGEABLE
Relay,electromagnetic
Cross-Reference Index
Part NumberManufacturer
M5757/40-001 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
M5757-40-001 Leach International Germany Gmbh (DEU)
MIL-R-5757/40 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
5945-00-136-8399INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
5945-00-253-0239INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
5945-00-403-3905INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
5945-00-405-3906INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
5945-00-435-1184INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
5945-01-117-0523INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
5945-01-117-2546INTERCHANGEABLE
RELAY,ELECTROMAGNETIC

Frequently Asked Questions

What is NSN 5945-00-458-3157?

NSN 5945-00-458-3157 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: active.

What are the part numbers for NSN 5945-00-458-3157?

NSN 5945-00-458-3157 has 3 cross-referenced part numbers: M5757/40-001 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), M5757-40-001 (Leach International Germany Gmbh), MIL-R-5757/40 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 5945-00-458-3157?

There are 7 known substitutes for 5945-00-458-3157: 5945-00-136-8399, 5945-00-253-0239, 5945-00-403-3905 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of M5757/40-001?

Key specifications for M5757/40-001: Terminal Type and Quantity: 8 WIRE LEAD ALL FUNCTIONS; Coil Quantity: 1; Main Contact Load Current Rating at Maximum Rated Voltage: 100.0 MILLIAMPERES DC LAMP LOAD; Environmental Protection: HERMETIC. 21 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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