PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

9-81RSwitch,mercury

Mercoid Corp the · NSN 5930-00-240-3551 · FSC 5930 · No Item Name Available
Verified by PartsTable
NSN 5930-00-240-3551 — this item is cataloged by the U.S. Government under National Stock Number 5930-00-240-3551. Primary manufacturer part number: 9-81R.
Features
  • Switch,mercury — FSC 5930
  • Nonpile-Up Contact Arrangement: 1 POLE, SINGLE THROW, BOTH POSITIONS MAINTAINED SINGLE SWITCH UNIT
  • Body Length: 2.000 INCHES NOMINAL IN
  • Body Diameter: 0.516 INCHES NOMINAL IN
  • Body Style: UNCASED
  • Mounting Method: PANEL
  • Maximum Voltage Rating in Volts: 230.0 AC AND 230.0 DC
  • Contact Load Current Rating at Maximum Rated Voltage: 70.000 MILLIAMPERES RESISTIVE DC AND 150.000 MILLIAMPERES RESISTIVE AC
Applications
  • Circuit control and protection
  • Equipment power management
  • Signal routing
General Description

The Switch,mercury, cataloged under National Stock Number 5930-00-240-3551, 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 Mercoid Corp the. Government technical data includes 7 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5930-00-240-3551
Primary Part Number9-81R
Item NameSwitch,mercury
FSC / FSG5930 / 59 — No Item Name Available
ManufacturerMercoid Corp the
StatusCANCELLED
Nonpile-Up Contact Arrangement1 POLE, SINGLE THROW, BOTH POSITIONS MAINTAINED SINGLE SWITCH UNIT
Body Length2.000 INCHES NOMINAL IN
Body Diameter0.516 INCHES NOMINAL IN
Body StyleUNCASED
Mounting MethodPANEL
Maximum Voltage Rating in Volts230.0 AC AND 230.0 DC
Contact Load Current Rating at Maximum Rated Voltage70.000 MILLIAMPERES RESISTIVE DC AND 150.000 MILLIAMPERES RESISTIVE AC
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 1
5930-00-075-46739-8107-SC-8T INTERCHANGEABLE
Switch,mercury
Dwyer Instruments Inc
Cross-Reference Index
Part NumberManufacturer
9-81R Mercoid Corp the (USA)
U7611 Siemens Water Technologies Corp. Div Wallace & Tiernan Products (USA)
Related Parts
5930-00-075-4673INTERCHANGEABLE
SWITCH,MERCURY
9-8107-SC-8T

Frequently Asked Questions

What is NSN 5930-00-240-3551?

NSN 5930-00-240-3551 is a Switch,mercury, manufactured by Mercoid Corp the, classified under FSC 5930 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5930-00-240-3551?

NSN 5930-00-240-3551 has 2 cross-referenced part numbers: 9-81R (Mercoid Corp the), U7611 (Siemens Water Technologies Corp. Div Wallace & Tiernan Products).

What NSN replaces 5930-00-240-3551?

There is 1 known substitute for 5930-00-240-3551: 5930-00-075-4673. Verify interchangeability with system specifications before substitution.

What are the specifications of 9-81R?

Key specifications for 9-81R: Nonpile-Up Contact Arrangement: 1 POLE, SINGLE THROW, BOTH POSITIONS MAINTAINED SINGLE SWITCH UNIT; Body Length: 2.000 INCHES NOMINAL IN; Body Diameter: 0.516 INCHES NOMINAL IN; Body Style: UNCASED. 10 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5930-00-240-3551 still in active supply?

NSN 5930-00-240-3551 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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