PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

B1789Relay,thermal

Meggitt (new Hampshire), Inc · NSN 5945-00-351-4677 · FSC 5945 · No Item Name Available
Verified by PartsTable
NSN 5945-00-351-4677 — this item is cataloged by the U.S. Government under National Stock Number 5945-00-351-4677. Primary manufacturer part number: B1789.
Features
  • Relay,thermal — FSC 5945
  • Contact Maximum Voltage Rating in Volts: 230.0 AC
  • Mounting Facility Type and Quantity: 1 OCTAL BASE PLUG-IN
  • Heater Power Rating in Watts: 5.0
  • Contact Maximum Current Rating in Amps: 3.0 AC
  • Contact Arrangement: SINGLE POLE, SINGLE THROW, NORMALLY OPEN
  • Overall Diameter: 1.250 INCHES NOMINAL IN
  • Heater Voltage Rating in Volts: 115.0
Applications
  • Circuit control and protection
  • Equipment power management
  • Signal routing
General Description

The Relay,thermal, cataloged under National Stock Number 5945-00-351-4677, is classified within Federal Supply Class 5945 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Meggitt (new Hampshire), Inc. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5945-00-351-4677
Primary Part NumberB1789
Item NameRelay,thermal
FSC / FSG5945 / 59 — No Item Name Available
ManufacturerMeggitt (new Hampshire), Inc
StatusACTIVE
Contact Maximum Voltage Rating in Volts230.0 AC
Mounting Facility Type and Quantity1 OCTAL BASE PLUG-IN
Heater Power Rating in Watts5.0
Contact Maximum Current Rating in Amps3.0 AC
Contact ArrangementSINGLE POLE, SINGLE THROW, NORMALLY OPEN
Overall Diameter1.250 INCHES NOMINAL IN
Heater Voltage Rating in Volts115.0
Delay Time in Seconds20.0 FIXED OPERATE NOMINAL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
4820-00-889-54461790-131 INTERCHANGEABLE
Seat,valve
Cooper Cameron Corp Cooper Cameron Valves Div
Cross-Reference Index
Part NumberManufacturer
B1789 Meggitt (new Hampshire), Inc (USA)
Related Parts
4820-00-889-5446INTERCHANGEABLE
SEAT,VALVE
1790-131

Frequently Asked Questions

What is NSN 5945-00-351-4677?

NSN 5945-00-351-4677 is a Relay,thermal, manufactured by Meggitt (new Hampshire), Inc, classified under FSC 5945 (No Item Name Available). Status: active.

What are the part numbers for NSN 5945-00-351-4677?

NSN 5945-00-351-4677 has 1 cross-referenced part number: B1789 (Meggitt (new Hampshire), Inc).

What NSN replaces 5945-00-351-4677?

There is 1 known substitute for 5945-00-351-4677: 4820-00-889-5446. Verify interchangeability with system specifications before substitution.

What are the specifications of B1789?

Key specifications for B1789: Overall Length: 3.375 INCHES NOMINAL IN; Contact Maximum Voltage Rating in Volts: 230.0 AC; Mounting Facility Type and Quantity: 1 OCTAL BASE PLUG-IN; Heater Power Rating in Watts: 5.0. 9 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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