OVERVIEW

Official designation: Allen-Bradley 140U-D6D3-C30 (Bulletin 140U, Molded Case Circuit Breaker)

Role/Application: D-Frame, 3-pole current-limiting MCCB with a 30 A rated current, providing fixed thermal and adjustable magnetic protection for industrial motor and feeder circuits.

KEY SPECS SUMMARY

Power: 480 Volts AC maximum

Interfaces / Ports: Load and line terminals

Indicators: Trip status flag

Operating Temp: Minus 25 to plus 60 degrees C

Platform / Compatibility: D-Frame; UL 489, CSA, CE

Limit: Interrupting rating 65 kA at 480V

Lifecycle: Discontinued by manufacturer

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the trip unit type and configuration for the 140U-D6D3-C30 breaker?

A: The breaker features a thermal-magnetic trip unit with fixed thermal and adjustable magnetic settings.

Wiring & Installation:

Q: What are the typical dimensions (H x W x D) of the D-Frame 140U circuit breaker for panel layout?

A: The dimensions are approximately 102 millimeters high, 45 millimeters wide, and 85 millimeters deep.

Troubleshooting & Compatibility:

Q: What is the specified copper wire temperature rating required for connection to the 140U-D terminals?

A: The 140U-D frame terminals require the use of 75 degrees C rated copper wire only.

Replacement & Upgrades:

Q: What is the current Allen-Bradley product series generally recommended as a replacement for the discontinued Bulletin 140U breakers?

A: The current replacement is generally the Allen-Bradley Bulletin 140G or 140UT Molded Case Circuit Breaker series.