PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

443-4Switch,thermostatic

Essex Group Inc Controls Div Lexington Plant · NSN 5930-00-950-6591 · FSC 5930 · No Item Name Available
Verified by PartsTable
NSN 5930-00-950-6591 — this item is cataloged by the U.S. Government under National Stock Number 5930-00-950-6591. Primary manufacturer part number: 443-4.
Features
  • Switch,thermostatic — FSC 5930
  • Temp Sensing Element Type: FUSABLE LINK
  • Nonpile-Up Contact Arrangement: 1 POLE, SINGLE THROW, NORMALLY CLOSED, MOMENTARY ACTION
  • Contact Voltage Rating in Volts: 200.0 AC AT SEA LEVEL SINGLE VOLTAGE
  • Terminal Type: TAB, SOLDER LUG
  • Overall Diameter: 0.328 INCHES NOMINAL IN
  • Contact Load Current Rating: 5.0 AMPERES RESISTIVE LOAD SINGLE VOLTAGE
  • Contact Action Stimulus: INCREASE
Applications
  • Circuit control and protection
  • Equipment power management
  • Signal routing
General Description

The Switch,thermostatic, cataloged under National Stock Number 5930-00-950-6591, is classified within Federal Supply Class 5930 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Essex Group Inc Controls Div Lexington Plant. Government technical data includes 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 4 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
NSN5930-00-950-6591
Primary Part Number443-4
Item NameSwitch,thermostatic
FSC / FSG5930 / 59 — No Item Name Available
ManufacturerEssex Group Inc Controls Div Lexington Plant
StatusCANCELLED
Temp Sensing Element TypeFUSABLE LINK
Nonpile-Up Contact Arrangement1 POLE, SINGLE THROW, NORMALLY CLOSED, MOMENTARY ACTION
Contact Voltage Rating in Volts200.0 AC AT SEA LEVEL SINGLE VOLTAGE
Terminal TypeTAB, SOLDER LUG
Overall Diameter0.328 INCHES NOMINAL IN
Contact Load Current Rating5.0 AMPERES RESISTIVE LOAD SINGLE VOLTAGE
Contact Action StimulusINCREASE
Contact AdjustabilityACTUATION POINT NOT ADJUSTABLE
Contact Stimulus Rating360.00 ACTUATION POINT NOMINAL DEGREES FAHRENHEIT
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
4310-00-354-84818166 INTERCHANGEABLE
Ring Set,piston
Quincy Compressor Division of Coltec Industries Inc Dba Quincy Compressor Div Quincy Compressor
2910-00-633-1328 INTERCHANGEABLE
Pump,fuel,cam Actuated
4730-00-810-77724434 INTERCHANGEABLE
Strainer Element,sediment
Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems
4530-00-868-2916 INTERCHANGEABLE
Sprayer Plate Set
2940-00-973-969051190 INTERCHANGEABLE
Filter Element,fluid
Wix Corp
5905-00-994-72884434 INTERCHANGEABLE
Resistor,fixed,film
Ohmite Holding, L.l.c. Dba Ohmite Manufacturing
3010-01-070-0186521-00365 INTERCHANGEABLE
Parts Kit,clutch Disk
Stromag Inc
9140-01-107-6139 INTERCHANGEABLE
Fuel Oil,burner
5305-01-163-74234434 INTERCHANGEABLE
Screw,shoulder
Roller Bearing Co of America, Inc Div Pic Design
5365-01-368-559144-34 INTERCHANGEABLE
Spacer,sleeve
Celtech Corporation
Cross-Reference Index
Part NumberManufacturer
443-4 Essex Group Inc Controls Div Lexington Plant
910C079-2 Hamilton Sundstrand Corporation (USA)
FL4 Essex Group Inc Controls Div Lexington Plant
910C079-2 Sundstrand Corp Electric Power Systems Div (USA)
FL4A Essex Group Inc Controls Div Lexington Plant
910C079-2 Westinghouse Electric Corp (USA)
Related Parts
4310-00-354-8481INTERCHANGEABLE
RING SET,PISTON
8166
2910-00-633-1328INTERCHANGEABLE
PUMP,FUEL,CAM ACTUATED
4730-00-810-7772INTERCHANGEABLE
STRAINER ELEMENT,SEDIMENT
4434
4530-00-868-2916INTERCHANGEABLE
SPRAYER PLATE SET
2940-00-973-9690INTERCHANGEABLE
FILTER ELEMENT,FLUID
51190
5905-00-994-7288INTERCHANGEABLE
RESISTOR,FIXED,FILM
4434
3010-01-070-0186INTERCHANGEABLE
PARTS KIT,CLUTCH DISK
521-00365
9140-01-107-6139INTERCHANGEABLE
FUEL OIL,BURNER
5305-01-163-7423INTERCHANGEABLE
SCREW,SHOULDER
4434
5365-01-368-5591INTERCHANGEABLE
SPACER,SLEEVE
44-34
5120-01-393-1580INTERCHANGEABLE
HANDLE,SOCKET WRENCH
4720-01-470-5987INTERCHANGEABLE
HOSE,NONMETALLIC
4434

Frequently Asked Questions

What is NSN 5930-00-950-6591?

NSN 5930-00-950-6591 is a Switch,thermostatic, manufactured by Essex Group Inc Controls Div Lexington Plant, classified under FSC 5930 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5930-00-950-6591?

NSN 5930-00-950-6591 has 6 cross-referenced part numbers: 443-4 (Essex Group Inc Controls Div Lexington Plant), 910C079-2 (Hamilton Sundstrand Corporation), FL4 (Essex Group Inc Controls Div Lexington Plant), 910C079-2 (Sundstrand Corp Electric Power Systems Div), FL4A (Essex Group Inc Controls Div Lexington Plant) and 1 more.

What NSN replaces 5930-00-950-6591?

There are 12 known substitutes for 5930-00-950-6591: 4310-00-354-8481, 2910-00-633-1328, 4730-00-810-7772 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 443-4?

Key specifications for 443-4: Temp Sensing Element Type: FUSABLE LINK; Nonpile-Up Contact Arrangement: 1 POLE, SINGLE THROW, NORMALLY CLOSED, MOMENTARY ACTION; Contact Voltage Rating in Volts: 200.0 AC AT SEA LEVEL SINGLE VOLTAGE; Terminal Type: TAB, SOLDER LUG. 11 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5930-00-950-6591 still in active supply?

NSN 5930-00-950-6591 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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