The Switch,thermostatic, cataloged under National Stock Number 5930-00-660-3731, is classified within Federal Supply Class 5930 (Switches) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Westinghouse Electric Corp. Government technical data includes 20 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5930-00-660-3731 |
| Primary Part Number | 54B6721H03 |
| Item Name | Switch,thermostatic |
| FSC / FSG | 5930 / 59 — Switches |
| Manufacturer | Westinghouse Electric Corp |
| Status | ACTIVE |
| Body Diameter | 0.500 INCHES NOMINAL IN |
| Contact Action Stimulus | INCREASE |
| Terminal Type | TAB W/SCREW |
| Mounting Facility Pattern | THREE POSITION CIRCULAR |
| Overall Diameter | 1.500 INCHES NOMINAL IN |
| Mounting Facility Circle Radius | 0.500 INCHES NOMINAL IN |
| Contact Load Current Rating | 2.5 AMPERES RESISTIVE LOAD SINGLE VOLTAGE |
| Mounting Method | FLANGE AND UNTHREADED HOLE(S) |
| Contact Adjustment Range | +98.00 TO 108.00 ACTUATION POINT DEGREES FAHRENHEIT |
| Unthreaded Mounting Hole Diameter | 0.120 INCHES NOMINAL IN |
| Style Designator | CYLINDRICAL W/FLANGE |
| Temp Sensing Element Type | IMMERSION WELL |
| Contact Adjustment Type | EXTERNAL ACTUATION POINT SCREW |
| Body Length | 1.786 INCHES MINIMUM AND 2.126 INCHES MAXIMUM IN |
| Operating Temp Rating | -273.1 CELSIUS MINIMUM AND 125.0 FAHRENHEIT MAXIMUM DEGC |
| Nonpile-Up Contact Arrangement | 1 POLE, SINGLE THROW, NORMALLY CLOSED, MOMENTARY ACTION |
| Media for Which Designed | GAS OR LIQUID |
| Contact Stimulus Rating | 147.00 ACTUATION POINT MINIMUM DEGREES FAHRENHEIT |
| Contact Adjustability | DEACTUATION POINT NOT ADJUSTABLE, MANUAL RESET AND ACTUATION POINT ADJUSTABLE, PRESET |
| Contact Voltage Rating in Volts | 220.0 AC AT SEA LEVEL SINGLE VOLTAGE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 54B6721H03 | Westinghouse Electric Corp (USA) |
| Reference | Meaning |
|---|---|
| 2140 | 5/9 Secondary reference Bard Electronics Inc |
| 54B6721H03 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5930-00-660-3731 is a Switch,thermostatic, manufactured by Westinghouse Electric Corp, classified under FSC 5930, Switches. Status: active.
NSN 5930-00-660-3731 has 1 manufacturer part number on file: 54B6721H03 (Westinghouse Electric Corp).
Key specifications for 54B6721H03: Body Diameter: 0.500 INCHES NOMINAL IN; Contact Action Stimulus: INCREASE; Terminal Type: TAB W/SCREW; Mounting Facility Pattern: THREE POSITION CIRCULAR. 20 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.