PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

B121Switch,thermostatic

Chromalox Inc · NSN 5930-01-680-4180 · FSC 5930 · No Item Name Available
Verified by PartsTable
NSN 5930-01-680-4180 — this item is cataloged by the U.S. Government under National Stock Number 5930-01-680-4180. Primary manufacturer part number: B121.
Features
  • Switch,thermostatic — FSC 5930
  • Temp Sensing Element Type: BULB
  • Media for Which Designed: LIQUID
  • Mounting Method: BASE
  • Contact Action Stimulus: DECREASE
  • 1 verified cross-reference
  • Primary manufacturer: Chromalox Inc
Applications
  • Circuit control and protection
  • Equipment power management
  • Signal routing
General Description

The Switch,thermostatic, cataloged under National Stock Number 5930-01-680-4180, 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 Chromalox Inc. Government technical data includes 4 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5930-01-680-4180
Primary Part NumberB121
Item NameSwitch,thermostatic
FSC / FSG5930 / 59 — No Item Name Available
ManufacturerChromalox Inc
StatusACTIVE
Temp Sensing Element TypeBULB
Media for Which DesignedLIQUID
Mounting MethodBASE
Contact Action StimulusDECREASE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
6135-00-112-8634 INTERCHANGEABLE
Battery,nonrechargeable
9905-00-318-01878378551 INTERCHANGEABLE
Plate,identification
U S Army Tank Automotive Command Amsta-Im-Mm
6750-00-522-2706 INTERCHANGEABLE
Plasticizer,photographic
5999-00-735-98651A4437G32 INTERCHANGEABLE
Heater,thermal Release
Westinghouse Electric Corp
5365-01-081-1010SM-C-772659-4 INTERCHANGEABLE
Shim
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
4820-01-252-4457B121 INTERCHANGEABLE
Valve,gate
Stockham Valves and Fittings Inc
Cross-Reference Index
Part NumberManufacturer
B121 PRIMARY Chromalox Inc (USA)
Related Parts
6135-00-112-8634INTERCHANGEABLE
BATTERY,NONRECHARGEABLE
9905-00-318-0187INTERCHANGEABLE
PLATE,IDENTIFICATION
8378551
6750-00-522-2706INTERCHANGEABLE
PLASTICIZER,PHOTOGRAPHIC
5999-00-735-9865INTERCHANGEABLE
HEATER,THERMAL RELEASE
1A4437G32
5365-01-081-1010INTERCHANGEABLE
SHIM
SM-C-772659-4
4820-01-252-4457INTERCHANGEABLE
VALVE,GATE
B121

Frequently Asked Questions

What is NSN 5930-01-680-4180?

NSN 5930-01-680-4180 is a Switch,thermostatic, manufactured by Chromalox Inc, classified under FSC 5930 (No Item Name Available). Status: active.

What are the part numbers for NSN 5930-01-680-4180?

NSN 5930-01-680-4180 has 1 cross-referenced part number: B121 (Chromalox Inc).

What NSN replaces 5930-01-680-4180?

There are 6 known substitutes for 5930-01-680-4180: 6135-00-112-8634, 9905-00-318-0187, 6750-00-522-2706 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of B121?

Key specifications for B121: Temp Sensing Element Type: BULB; Media for Which Designed: LIQUID; Mounting Method: BASE; Contact Action Stimulus: DECREASE. 4 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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