PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

FC-210Ratio Relay and Sta

Elsag Bailey Inc · NSN 6685-00-777-9559 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-00-777-9559 — this item is cataloged by the U.S. Government under National Stock Number 6685-00-777-9559. Primary manufacturer part number: FC-210.
Features
  • Ratio Relay and Sta — FSC 6685
  • 8 verified cross-references
  • Primary manufacturer: Elsag Bailey Inc
Applications
  • Circuit control and protection
  • Equipment power management
  • Signal routing
General Description

The Ratio Relay and Sta, cataloged under National Stock Number 6685-00-777-9559, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Elsag Bailey Inc. This item has 8 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameRatio Relay and Sta
FSC / FSG6685 — No Item Name Available (FSG 66)
ManufacturersElsag Bailey Inc (CAGE 05168); Babcock & Wilcox Co (CAGE 05073); The Babcock & Wilcox Company Dba B & W Service Co Div B&w Service Company (CAGE 58529)
Technical Specifications
ParameterValue
NSN6685-00-777-9559
Primary Part NumberFC-210
Item NameRatio Relay and Sta
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerElsag Bailey Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
5945-01-032-4735 INTERCHANGEABLE
Relay,electromagnetic
4920-01-617-7329FC2-10 INTERCHANGEABLE
Die,panel Fastener Installation
Fastener Tooling Company Dba Fastool
Cross-Reference Index
Part NumberManufacturer
B5031129APCALL Elsag Bailey Inc (USA)
MINILINE52OFC210 Babcock & Wilcox Co (USA)
FC210-P92-11 Babcock & Wilcox Co (USA)
FC-210 PRIMARY Elsag Bailey Inc (USA)
MINILINE52OFC210 The Babcock & Wilcox Company Dba B & W Service Co Div B&w Service Company (USA)
FC210-P92-11 The Babcock & Wilcox Company Dba B & W Service Co Div B&w Service Company (USA)
5321424A3 Elsag Bailey Inc (USA)
H5321424PCALL Elsag Bailey Inc (USA)
Related Parts
5945-01-032-4735INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
4920-01-617-7329INTERCHANGEABLE
DIE,PANEL FASTENER INSTALLATION
FC2-10

Frequently Asked Questions

What is NSN 6685-00-777-9559?

NSN 6685-00-777-9559 is a Ratio Relay and Sta, manufactured by Elsag Bailey Inc, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-00-777-9559?

NSN 6685-00-777-9559 has 8 cross-referenced part numbers: B5031129APCALL (Elsag Bailey Inc), MINILINE52OFC210 (Babcock & Wilcox Co), FC210-P92-11 (Babcock & Wilcox Co), FC-210 (Elsag Bailey Inc), MINILINE52OFC210 (The Babcock & Wilcox Company Dba B & W Service Co Div B&w Service Company) and 3 more.

What NSN replaces 6685-00-777-9559?

There are 2 known substitutes for 6685-00-777-9559: 5945-01-032-4735, 4920-01-617-7329. Verify interchangeability with system specifications before substitution.

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