Control Assembly, AC6685-01-540-9931

NSN 6685-01-540-9931 · NIIN 015409931 · Part number 478D1004-1

Ems Development Corporation · FSC 6685 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments · FSG 66 — Instruments and Laboratory Equipment · CAGE 51435

Government record, cited

NSN 6685-01-540-9931 — this item is cataloged by the U.S. Government under National Stock Number 6685-01-540-9931. Manufacturer of record part number: 478D1004-1.

Also searched as 6685-01-540-9931 · 6685015409931 · NIIN 015409931 · 01-540-9931 · FSC 6685 Pressure, Temperature, and Humidity Measuring and Controlling Instruments · CAGE 51435 · 478D1004-1 · 478D0200-2 ITEM 7 · 478D1004-3 ITEM 1 · 478D0200 ITEM 7

Nearby stock numbers ← 6685-01-540-9911 Control Lvps Assemb · 6685-01-541-0095 →

Features

Control Assembly,ac — FSC 6685
4 manufacturer part numbers on file
Manufacturer of record: Ems Development Corporation

Identification

NSN: 6685-01-540-9931
NIIN: 015409931
FSC: 6685 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments
FSG: 66 — Instruments and Laboratory Equipment
Primary part number: 478D1004-1
Manufacturer: Ems Development Corporation

General Description

The Control Assembly,ac, cataloged under National Stock Number 6685-01-540-9931, is classified within Federal Supply Class 6685 (Pressure, Temperature, and Humidity Measuring and Controlling Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Ems Development Corporation. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	6685-01-540-9931
Primary Part Number	478D1004-1
Item Name	Control Assembly,ac
FSC / FSG	6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments
Manufacturer	Ems Development Corporation
Status	ACTIVE

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	Possible hazard — SDS may be required (DLA HMIC P)
Criticality Code	X

Cross-Reference Index

Part Number	Manufacturer
478D1004-1 PRIMARY	Ems Development Corporation (USA)
478D0200-2 ITEM 7	Ems Development Corporation (USA)
478D1004-3 ITEM 1	Ems Development Corporation (USA)
478D0200 ITEM 7	Ems Development Corporation (USA)

No interchangeability data on file.

Other items in FSC 6685 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

6685-00-001-1475

6685-00-001-1475 · Item name not on file

6685-00-001-1503

CONTROL,TOTALIZER

6685-00-001-1643

6685-00-001-1643 · Item name not on file

6685-00-001-1711

GAGE,PRESSURE,DIAL INDICATING

6685-00-001-2099

6685-00-001-2099 · Item name not on file

6685-00-001-2100

6685-00-001-2100 · Item name not on file

6685-00-001-2101

6685-00-001-2101 · Item name not on file

6685-00-001-2102

6685-00-001-2102 · Item name not on file

Frequently Asked Questions

What is NSN 6685-01-540-9931?

NSN 6685-01-540-9931 is a Control Assembly,ac, manufactured by Ems Development Corporation, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.

What part numbers are listed for NSN 6685-01-540-9931?

NSN 6685-01-540-9931 has 4 manufacturer part numbers on file: 478D1004-1 (Ems Development Corporation), 478D0200-2 ITEM 7 (Ems Development Corporation), 478D1004-3 ITEM 1 (Ems Development Corporation), 478D0200 ITEM 7 (Ems Development Corporation).

What are the specifications of 478D1004-1?

Key specifications for 478D1004-1: Special Features: ITEM PREVIOUSLY KNOWN AS CONTROLZASSEMBLYZAC; Part Name Assigned by Controlling Agency: AC CONTROL ASSEMBLY; End Item Identification: AMPLIFIER UNIT, BPAU (BIPOLAR AMPLIFIER UNIT ASSEMBLY). 0 specifications are documented in the U.S. Government catalog.

Is NSN 6685-01-540-9931 hazardous material?

Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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