The Switch,thermostatic, cataloged under National Stock Number 5930-00-578-9641, 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 21 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5930-00-578-9641 |
| Primary Part Number | 54B6721H04 |
| Item Name | Switch,thermostatic |
| FSC / FSG | 5930 / 59 — Switches |
| Manufacturer | Westinghouse Electric Corp |
| Status | ACTIVE |
| Body Diameter | 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN |
| Frequency in Hertz | 60.0 SINGLE VOLTAGE |
| Contact Action Stimulus | INCREASE |
| Terminal Type | WIRE LEAD |
| Mounting Facility Pattern | THREE POSITION CIRCULAR |
| Bulb Length | 1.750 INCHES MINIMUM AND 2.090 INCHES MAXIMUM IN |
| Overall Diameter | 1.500 INCHES NOMINAL IN |
| Bulb Diameter | 0.500 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 | +147.00 TO 157.00 ACTUATION POINT DEGREES FAHRENHEIT AND +147.00 TO 157.00 DEACTUATION POINT DEGREES FAHRENHEIT |
| Unthreaded Mounting Hole Diameter | 0.160 INCHES NOMINAL IN |
| Style Designator | CYLINDRICAL W/FLANGE |
| Temp Sensing Element Type | BULB |
| Contact Adjustment Type | EXTERNAL DEACTUATION POINT SCREW AND EXTERNAL ACTUATION POINT SCREW |
| Body Length | 1.750 INCHES MINIMUM AND 2.090 INCHES MAXIMUM IN |
| Nonpile-Up Contact Arrangement | 1 POLE, SINGLE THROW, NORMALLY CLOSED, MOMENTARY ACTION |
| Media for Which Designed | GAS OR LIQUID |
| Contact Adjustability | DEACTUATION POINT ADJUSTABLE AND ACTUATION POINT ADJUSTABLE |
| 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 |
|---|---|
| 54B6721H04 | Westinghouse Electric Corp (USA) |
| Reference | Meaning |
|---|---|
| 54B6721H04 | 3/2 Design control — primary reference U.S. Government activity |
| VC-9043 | 5/2 Secondary reference U.S. Government activity |
| 4S2101 | 5/9 Secondary reference Bard Electronics Inc |
NSN 5930-00-578-9641 is a Switch,thermostatic, manufactured by Westinghouse Electric Corp, classified under FSC 5930, Switches. Status: active.
NSN 5930-00-578-9641 has 1 manufacturer part number on file: 54B6721H04 (Westinghouse Electric Corp).
Key specifications for 54B6721H04: Body Diameter: 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN; Frequency in Hertz: 60.0 SINGLE VOLTAGE; Contact Action Stimulus: INCREASE; Terminal Type: WIRE LEAD. 21 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.