The Relay,electromagnetic, cataloged under National Stock Number 5945-01-208-0646, is classified within Federal Supply Class 5945 (Relays and Solenoids) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Idec Systems and Controls Corp. Government technical data includes 24 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 | 5945-01-208-0646 |
| Primary Part Number | RH4B-U-120AC |
| Item Name | Relay,electromagnetic |
| FSC / FSG | 5945 / 59 — Relays and Solenoids |
| Manufacturer | Idec Systems and Controls Corp |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 1 PLUG-IN TERMINAL(S) SINGLE MOUNTING FACILITY |
| Main Contact Maximum Voltage Rating in Volts | 240.0 AC AND 30.0 DC |
| Fragility Factor | MODERATELY RUGGED |
| Arc Quenching Method | AIR |
| Precious Material | SILVER |
| Main Contact Load Current Rating at Maximum Rated Voltage | 5.0 AMPERES AC AND 5.0 AMPERES DC INDUCTIVE LOAD |
| Main Contact Load Current Rating at Maximum Rated Voltage | 7.5 AMPERES AC AND 10.0 AMPERES DC RESISTIVE LOAD |
| Duty Type | CONTINUOUS |
| Storage Type | GENERAL PURPOSE WAREHOUSE |
| Winding DC Resistance Rating | 2.0 KILOHMS MINIMUM AND 2.4 KILOHMS MAXIMUM SINGLE WINDING |
| Nominal Operating Current Rating and Type | 12.9 MILLIAMPERES AC SINGLE WINDING |
| Time Delay | 0.025 SECONDS MAXIMUM FIXED OPERATE AND RELEASE TIME |
| Coil Quantity | 1 |
| Environmental Protection | DUSTPROOF |
| Precious Material and Location | CONTACTS SILVER |
| Cubic Measure | 2.885 CUBIC INCHES |
| Winding Quantity | 1 |
| Operating Voltage Rating and Type at Specified Temp | 120.0 VOLTS AC 25 DEG CELSIUS SINGLE WINDING |
| Material | PLASTIC CASE |
| Material | SILVER CONTACT |
| Energizing Element Power Rating | 2.5 VOLTS-AMPERES |
| Terminal Type and Quantity | 14 TAB, SOLDER LUG ALL FUNCTIONS |
| Nonpile-Up Main Contact Arrangement | 4 POLE, DOUBLE THROW, ONE POSITION MOMENTARY |
| Purpose for Which Designed | GENERAL |
| 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 |
|---|---|
| RH4B-U-120AC PRIMARY | Idec Systems and Controls Corp (USA) |
NSN 5945-01-208-0646 is a Relay,electromagnetic, manufactured by Idec Systems and Controls Corp, classified under FSC 5945, Relays and Solenoids. Status: active.
NSN 5945-01-208-0646 has 1 manufacturer part number on file: RH4B-U-120AC (Idec Systems and Controls Corp).
Key specifications for RH4B-U-120AC: Mounting Facility Type and Quantity: 1 PLUG-IN TERMINAL(S) SINGLE MOUNTING FACILITY; Overall Height: 1.652 INCHES MAXIMUM IN; Main Contact Maximum Voltage Rating in Volts: 240.0 AC AND 30.0 DC; Fragility Factor: MODERATELY RUGGED. 24 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.