The Relay,electromagnetic, cataloged under National Stock Number 5945-01-493-4161, is classified within Federal Supply Class 5945 (Relays and Solenoids) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Te Connectivity Corporation. Government technical data includes 19 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5945-01-493-4161 |
| Primary Part Number | C-21AA |
| Item Name | Relay,electromagnetic |
| FSC / FSG | 5945 / 59 — Relays and Solenoids |
| Manufacturer | Te Connectivity Corporation |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 4 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY |
| Main Contact Maximum Voltage Rating in Volts | 208.0 AC |
| Mounting Facility Pattern | RECTANGULAR SINGLE MOUNTING FACILITY |
| Center to Center Distance Between Mounting Facilities Parallel to Length | 1.875 INCHES NOMINAL SINGLE MOUNTING FACILITY IN |
| Main Contact Load Current Rating at Maximum Rated Voltage | 25.0 AMPERES AC RESISTIVE LOAD |
| Main Contact Load Current Rating at Maximum Rated Voltage | 25.0 AMPERES AC MOTOR LOAD |
| Main Contact Load Current Rating at Maximum Rated Voltage | 5.0 AMPERES AC LAMP LOAD |
| Unthreaded Mounting Hole Diameter | 0.176 INCHES MINIMUM AND 0.182 INCHES MAXIMUM SINGLE MOUNTING FACILITY IN |
| Frequency in Hertz | 400.0 NOMINAL |
| Auxiliary Contact Load Current Rating at Maximum Rated Voltage | 3.0 AMPERES AC RESISTIVE LOAD |
| Auxiliary Contact Load Current Rating at Maximum Rated Voltage | 3.0 AMPERES AC INDUCTIVE LOAD |
| Auxiliary Contact Load Current Rating at Maximum Rated Voltage | 1.0 AMPERES AC LAMP LOAD |
| Coil Quantity | 1 |
| Winding Quantity | 1 |
| Operating Voltage Rating and Type at Specified Temp | 18.0 VOLTS DC 25 DEG CELSIUS SINGLE WINDING |
| Center to Center Distance Between Mounting Facilities Parallel to Width | 1.875 INCHES NOMINAL SINGLE MOUNTING FACILITY IN |
| Terminal Type and Quantity | 8 THREADED STUD ENERGIZING ELEMENT AND CONTACTS |
| Nonpile-Up Main Contact Arrangement | 3 POLE, SINGLE THROW, NORMALLY OPEN, DOUBLE MAKE, MOMENTARY ACTION |
| Auxiliary Contact Maximum Voltage Rating in Volts | 115.0 AC AND 28.0 DC |
| 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 |
|---|---|
| C-21AA PRIMARY | Te Connectivity Corporation (USA) |
NSN 5945-01-493-4161 is a Relay,electromagnetic, manufactured by Te Connectivity Corporation, classified under FSC 5945, Relays and Solenoids. Status: active.
NSN 5945-01-493-4161 has 1 manufacturer part number on file: C-21AA (Te Connectivity Corporation).
Key specifications for C-21AA: Mounting Facility Type and Quantity: 4 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY; Overall Height: 3.000 INCHES MAXIMUM IN; Main Contact Maximum Voltage Rating in Volts: 208.0 AC; Mounting Facility Pattern: RECTANGULAR SINGLE MOUNTING FACILITY. 19 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.