The Switch,liquid Level, cataloged under National Stock Number 6680-01-124-3352, is classified within Federal Supply Class 6680 (Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Setra Systems, Inc. Dba Gems Sensors. Government technical data includes 27 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6680-01-124-3352 |
| Primary Part Number | 51982 |
| Item Name | Switch,liquid Level |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Manufacturer | Setra Systems, Inc. Dba Gems Sensors |
| Status | ACTIVE |
| Relay | NOT INCLUDED |
| Actuation Method | BUOYANCY |
| Phase | SINGLE FIRST ALTERNATE OPERATING POWER RQMT |
| Phase | SINGLE SECOND ALTERNATE OPERATING POWER RQMT |
| Phase | SINGLE THIRD ALTERNATE OPERATING POWER RQMT |
| AC Voltage Rating | 120.0 VOLTS NOMINAL SECOND ALTERNATE OPERATING POWER RQMT |
| AC Voltage Rating | 240.0 VOLTS NOMINAL THIRD ALTERNATE OPERATING POWER RQMT |
| AC Voltage Rating | 50.0 VOLTS NOMINAL FIRST ALTERNATE OPERATING POWER RQMT |
| Overall Diameter | 6.125 INCHES NOMINAL IN |
| Current Rating at Maximum Rated Voltage | 0.06 AMPERES RESISTIVE LOAD AND 0.04 AMPERES RESISTIVE LOAD |
| DC Voltage Rating | 120.0 VOLTS NOMINAL SECOND ALTERNATE OPERATING POWER RQMT |
| DC Voltage Rating | 240.0 VOLTS NOMINAL THIRD ALTERNATE OPERATING POWER RQMT |
| DC Voltage Rating | 50.0 VOLTS NOMINAL FIRST ALTERNATE OPERATING POWER RQMT |
| Mounting Method | FLANGE |
| Voltage Rating at Maximum Rated Current | 50.0 VOLTS |
| Contact Arrangement | SPST,NORMALLY OPEN |
| Mounting Position | VERTICAL |
| Maximum Current Rating | 0.3 AMPERES RESISTIVE LOAD |
| Float Quantity | 2 |
| Liquid Type for Which Designed | HYDRAULIC OIL AND LUBRICATING OIL AND SEA WATER AND VARIOUS FUELS |
| Tank Insertion Length | 23.000 INCHES NOMINAL IN |
| Operating Temp Rating | 65.0 FAHRENHEIT MINIMUM AND 250.0 FAHRENHEIT MAXIMUM DEGF |
| Mounting Dimensions | MTD BY SIX 0.562 IN. DIA HOLES EQUALLY SPACED ON A 5.000 IN. DIA BOLT CIRCLE IN |
| Frequency Rating | 60.0 HERTZ NOMINAL FIRST ALTERNATE OPERATING POWER RQMT |
| Frequency Rating | 60.0 HERTZ NOMINAL SECOND ALTERNATE OPERATING POWER RQMT |
| Frequency Rating | 60.0 HERTZ NOMINAL THIRD ALTERNATE OPERATING POWER RQMT |
| Electrical Connection Type | TERMINAL LUG |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 51982 PRIMARY | Setra Systems, Inc. Dba Gems Sensors (USA) |
| Reference | Meaning |
|---|---|
| LS-51982 | 5/9 Secondary reference Setra Systems, Inc. Dba Gems Sensors |
NSN 6680-01-124-3352 is a Switch,liquid Level, manufactured by Setra Systems, Inc. Dba Gems Sensors, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
NSN 6680-01-124-3352 has 1 manufacturer part number on file: 51982 (Setra Systems, Inc. Dba Gems Sensors).
2 possible matches (shared part number, not a government interchangeability claim): 5930-01-345-4449, 1560-01-622-2916. Verify interchangeability with system specifications before substitution.
Key specifications for 51982: Relay: NOT INCLUDED; Actuation Method: BUOYANCY; Phase: SINGLE FIRST ALTERNATE OPERATING POWER RQMT; Phase: SINGLE SECOND ALTERNATE OPERATING POWER RQMT. 27 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
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.