PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

H21Heater,thermal Release

Siemens Energy and Automation Inc Siemens Furnas Controls Div · NSN 5999-00-252-4691 · FSC 5999 · No Item Name Available
Verified by PartsTable
NSN 5999-00-252-4691 — this item is cataloged by the U.S. Government under National Stock Number 5999-00-252-4691. Primary manufacturer part number: H21.
Features
  • Heater,thermal Release — FSC 5999
  • 1 verified cross-reference
  • Primary manufacturer: Siemens Energy and Automation Inc Siemens Furnas Controls Div
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Heater,thermal Release, cataloged under National Stock Number 5999-00-252-4691, 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 Siemens Energy and Automation Inc Siemens Furnas Controls Div. This item has 1 commercial cross-reference from 1 manufacturer, 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)
ManufacturersSiemens Energy and Automation Inc Siemens Furnas Controls Div (CAGE 23826)
Successor NSN5999-01-056-6418 — Heater,thermal Release
Technical Specifications
ParameterValue
NSN5999-00-252-4691
Primary Part NumberH21
Item NameHeater,thermal Release
FSC / FSG5999 / 59 — No Item Name Available
ManufacturerSiemens Energy and Automation Inc Siemens Furnas Controls Div
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Shelf Life Code0
Unit of IssueEA
SMR CodeJ
Weight0.0200 lbs
Cube0.0069 cu ft
Verified Substitutes 4
5999-01-056-6418FH21 SUCCESSOR
Heater,thermal Release
Eaton Corporation Dba Eaton Inoac
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 PRIMARY Siemens Energy and Automation Inc Siemens Furnas Controls Div (USA)
Related Parts
5999-01-056-6418SUCCESSOR
HEATER,THERMAL RELEASE
FH21
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 5999-00-252-4691?

NSN 5999-00-252-4691 is a Heater,thermal Release, manufactured by Siemens Energy and Automation Inc Siemens Furnas Controls Div, classified under FSC 5999 (No Item Name Available). Status: active.

What are the part numbers for NSN 5999-00-252-4691?

NSN 5999-00-252-4691 has 1 cross-referenced part number: H21 (Siemens Energy and Automation Inc Siemens Furnas Controls Div).

What NSN replaces 5999-00-252-4691?

There are 4 known substitutes for 5999-00-252-4691: 5999-01-056-6418, 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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