The Relay,electromagnetic, cataloged under National Stock Number 5945-00-121-5826, is classified within Federal Supply Class 5945 (Relays and Solenoids) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Asco Power Technologies, L..p.. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 5945-00-121-5826 |
| Primary Part Number | 1054-188S57B |
| Item Name | Relay,electromagnetic |
| FSC / FSG | 5945 / 59 — Relays and Solenoids |
| Manufacturer | Asco Power Technologies, L..p. |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 2 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY |
| Main Contact Maximum Voltage Rating in Volts | 240.0 AC |
| Mounting Facility Pattern | IN-LINE SINGLE MOUNTING FACILITY |
| Center to Center Distance Between Mounting Facilities Parallel to Length | 7.000 INCHES NOMINAL SINGLE MOUNTING FACILITY IN |
| Main Contact Load Current Rating at Maximum Rated Voltage | 25.0 AMPERES AC RESISTIVE LOAD |
| Duty Type | CONTINUOUS |
| Unthreaded Mounting Hole Diameter | 0.250 INCHES NOMINAL SINGLE MOUNTING FACILITY IN |
| Frequency in Hertz | 60.0 NOMINAL |
| Winding DC Resistance Rating | 6.65 KILOHMS NOMINAL SINGLE WINDING |
| Coil Quantity | 1 |
| Winding Quantity | 1 |
| Operating Voltage Rating and Type at Specified Temp | 208.0 VOLTS AC 25 DEG CELSIUS SINGLE WINDING |
| Terminal Type and Quantity | 2 SCREW ENERGIZING ELEMENT |
| Terminal Type and Quantity | 4 SCREW CONTACTS |
| 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 |
|---|---|
| 188S57 | Asco Power Technologies, L..p. (USA) |
| 1054-188S57B PRIMARY | Asco Power Technologies, L..p. (USA) |
| Reference | Meaning |
|---|---|
| D22857 | 5/9 Secondary reference Duplex Div Warner and Swasey Co |
| JHP59-67 | 5/9 Secondary reference Hollingsworth John R Co |
| 188A57B | C/1 Advisory reference — outside the item-of-supply concept Automatic Switch Company Dba Asco |
| 1054-188S57B | 3/9 Design control — primary reference Automatic Switch Company Dba Asco |
| JHP37-22-21 | C/1 Advisory reference — outside the item-of-supply concept Hollingsworth John R Co |
| 64-037 | C/1 Advisory reference — outside the item-of-supply concept Automatic Switch Company Dba Asco |
| 188S57 | 5/9 Secondary reference Automatic Switch Company Dba Asco |
NSN 5945-00-121-5826 is a Relay,electromagnetic, manufactured by Asco Power Technologies, L..p., classified under FSC 5945, Relays and Solenoids. Status: active.
NSN 5945-00-121-5826 has 2 manufacturer part numbers on file: 188S57 (Asco Power Technologies, L..p.), 1054-188S57B (Asco Power Technologies, L..p.).
3 possible matches (shared part number, not a government interchangeability claim): 4130-00-125-8708, 6150-00-127-3833, 5915-00-501-0081. Verify interchangeability with system specifications before substitution.
Key specifications for 1054-188S57B: Mounting Facility Type and Quantity: 2 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY; Overall Height: 4.000 INCHES NOMINAL IN; Main Contact Maximum Voltage Rating in Volts: 240.0 AC; Mounting Facility Pattern: IN-LINE SINGLE MOUNTING FACILITY. 14 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.