PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

FH21Heater,thermal Release

Eaton Corporation Dba Eaton Inoac · NSN 5999-01-056-6418 · FSC 5999 · No Item Name Available
Verified by PartsTable
NSN 5999-01-056-6418 — this item is cataloged by the U.S. Government under National Stock Number 5999-01-056-6418. Primary manufacturer part number: FH21.
Features
  • Heater,thermal Release — FSC 5999
  • 4 verified cross-references
  • Primary manufacturer: Eaton Corporation Dba Eaton Inoac
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Heater,thermal Release, cataloged under National Stock Number 5999-01-056-6418, is classified within Federal Supply Class 5999 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Eaton Corporation Dba Eaton Inoac. 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. Unit of issue: EA.

Catalog Facts
Item NameHeater,thermal Release
FSC / FSG5999 — No Item Name Available (FSG 59)
ManufacturersWesco Distribution Inc (CAGE 89481); Westinghouse Electric Corp Control Business Unit (CAGE 11660); Eaton Corporation Dba Eaton Inoac (CAGE 89946)
Successor NSN5999-00-252-4691 — Heater,thermal Release
Technical Specifications
ParameterValue
NSN5999-01-056-6418
Primary Part NumberFH21
Item NameHeater,thermal Release
FSC / FSG5999 / 59 — No Item Name Available
ManufacturerEaton Corporation Dba Eaton Inoac
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
Successor5999-00-252-4691 (H21)
HAZMATNo
Shelf Life Code0
Unit of IssueEA
SMR CodeZN
Weight0.0600 lbs
Cube0.0017 cu ft
Verified Substitutes 4
5999-00-252-4691H21 SUCCESSOR
Heater,thermal Release
Siemens Energy and Automation Inc Siemens Furnas Controls Div
5910-00-196-1090H2-1 INTERCHANGEABLE
Capacitor,fixed,mica Dielectric
Standex Electrics Underwood Electricand Mfg Co. Div.
3455-01-050-0982 INTERCHANGEABLE
File,rotary
5950-01-104-7114 INTERCHANGEABLE
Transformer,audio Frequency
Cross-Reference Index
Part NumberManufacturer
H21 Wesco Distribution Inc (USA)
H-21 Westinghouse Electric Corp Control Business Unit
FH21 PRIMARY Eaton Corporation Dba Eaton Inoac (USA)
FH21 Wesco Distribution Inc (USA)
Related Parts
SUCCESSOR 5999-00-252-4691 Heater,thermal Release · H21
5910-00-196-1090INTERCHANGEABLE
CAPACITOR,FIXED,MICA DIELECTRIC
H2-1
3455-01-050-0982INTERCHANGEABLE
FILE,ROTARY
5950-01-104-7114INTERCHANGEABLE
TRANSFORMER,AUDIO FREQUENCY

Frequently Asked Questions

What is NSN 5999-01-056-6418?

NSN 5999-01-056-6418 is a Heater,thermal Release, manufactured by Eaton Corporation Dba Eaton Inoac, classified under FSC 5999 (No Item Name Available). Status: active.

What are the part numbers for NSN 5999-01-056-6418?

NSN 5999-01-056-6418 has 4 cross-referenced part numbers: H21 (Wesco Distribution Inc), H-21 (Westinghouse Electric Corp Control Business Unit), FH21 (Eaton Corporation Dba Eaton Inoac), FH21 (Wesco Distribution Inc).

What NSN replaces 5999-01-056-6418?

There are 4 known substitutes for 5999-01-056-6418: 5999-00-252-4691, 5910-00-196-1090, 3455-01-050-0982 and 1 more. Verify interchangeability with system specifications before substitution.

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