PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

500-AControl Box

Microtherm Llc · NSN 4520-01-426-3292 · FSC 4520 · No Item Name Available
Verified by PartsTable
NSN 4520-01-426-3292 — this item is cataloged by the U.S. Government under National Stock Number 4520-01-426-3292. Primary manufacturer part number: 500-A.
Features
  • Control Box — FSC 4520
  • General Characteristics Item Description: PROGRAMMABLE MICRO PROCESSOR-BASED BOILER CONTROL DEVICE; DESIGNED FOR GAS AND OIL-FIRED HOT WATER AND STEAM BOILERS AND HOT WATER HEATERS; BUILT IN LCD SCREEN; 8.5 INCHES H, 6.5 INCHES W, 5.0 INCHES D; 110 VOLTS AC, 60.0 HERTZ, 6 AMPS IN
  • 2 verified cross-references
  • Primary manufacturer: Microtherm Llc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Control Box, cataloged under National Stock Number 4520-01-426-3292, is classified within Federal Supply Class 4520 (No Item Name Available) of the Plumbing, Heating, and Waste Disposal group. The primary manufacturer of record is Microtherm Llc. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4520-01-426-3292
Primary Part Number500-A
Item NameControl Box
FSC / FSG4520 / 45 — No Item Name Available
ManufacturerMicrotherm Llc
StatusACTIVE
General Characteristics Item DescriptionPROGRAMMABLE MICRO PROCESSOR-BASED BOILER CONTROL DEVICE; DESIGNED FOR GAS AND OIL-FIRED HOT WATER AND STEAM BOILERS AND HOT WATER HEATERS; BUILT IN LCD SCREEN; 8.5 INCHES H, 6.5 INCHES W, 5.0 INCHES D; 110 VOLTS AC, 60.0 HERTZ, 6 AMPS IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
6695-00-005-1278 INTERCHANGEABLE
Transducer,motional Pickup
6515-00-065-960040A-1 INTERCHANGEABLE
Booth,audiometric Examination
Industrial Acoustics Company, Inc. Dba I a C Div Iac Acoustics
3895-00-221-1694 INTERCHANGEABLE
Extractor,pile,powered
5325-00-371-8108BS 78505 INTERCHANGEABLE
Clinch Plate,turnbutton Fastener
Morito Scovill Americas, Llc Dba Scovill Manufacturing
3010-00-474-1330400A INTERCHANGEABLE
Actuator,electro-Mechanical,line
Ge Aviation Systems Llc
4510-00-482-4660400A INTERCHANGEABLE
Valve,flush
Fluidmaster Inc
6625-00-502-7348500A INTERCHANGEABLE
Detecting Element,directional Co
Bird Electronic Corporation Div Bird Electronic Corp
5835-00-550-7734 INTERCHANGEABLE
Recorder-Reproducer,sound
6625-00-553-8152400A INTERCHANGEABLE
Voltmeter
Agilent Technologies, Inc. Div Agilent Technologies Headquarters
3520-00-621-0805 INTERCHANGEABLE
Finishing Machine,shoe
Cross-Reference Index
Part NumberManufacturer
500-A PRIMARY Microtherm Llc (USA)
400A Microtherm Llc (USA)
Related Parts
6695-00-005-1278INTERCHANGEABLE
TRANSDUCER,MOTIONAL PICKUP
6515-00-065-9600INTERCHANGEABLE
BOOTH,AUDIOMETRIC EXAMINATION
40A-1
3895-00-221-1694INTERCHANGEABLE
EXTRACTOR,PILE,POWERED
5325-00-371-8108INTERCHANGEABLE
CLINCH PLATE,TURNBUTTON FASTENER
BS 78505
3010-00-474-1330INTERCHANGEABLE
ACTUATOR,ELECTRO-MECHANICAL,LINE
400A
4510-00-482-4660INTERCHANGEABLE
VALVE,FLUSH
400A
6625-00-502-7348INTERCHANGEABLE
DETECTING ELEMENT,DIRECTIONAL CO
500A
5835-00-550-7734INTERCHANGEABLE
RECORDER-REPRODUCER,SOUND
6625-00-553-8152INTERCHANGEABLE
VOLTMETER
400A
3520-00-621-0805INTERCHANGEABLE
FINISHING MACHINE,SHOE
5985-00-729-4074INTERCHANGEABLE
ATTENUATOR,VARIABLE
MDC2017BB-40
6625-00-765-0469INTERCHANGEABLE
DETECTOR,RADIO FREQUENCY
100A

Frequently Asked Questions

What is NSN 4520-01-426-3292?

NSN 4520-01-426-3292 is a Control Box, manufactured by Microtherm Llc, classified under FSC 4520 (No Item Name Available). Status: active.

What are the part numbers for NSN 4520-01-426-3292?

NSN 4520-01-426-3292 has 2 cross-referenced part numbers: 500-A (Microtherm Llc), 400A (Microtherm Llc).

What NSN replaces 4520-01-426-3292?

There are 12 known substitutes for 4520-01-426-3292: 6695-00-005-1278, 6515-00-065-9600, 3895-00-221-1694 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 500-A?

Key specifications for 500-A: General Characteristics Item Description: PROGRAMMABLE MICRO PROCESSOR-BASED BOILER CONTROL DEVICE; DESIGNED FOR GAS AND OIL-FIRED HOT WATER AND STEAM BOILERS AND HOT WATER HEATERS; BUILT IN LCD SCREEN; 8.5 INCHES H, 6.5 INCHES W, 5.0 INCHES D; 110 VOLTS AC, 60.0 HERTZ, 6 AMPS IN. 1 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com