OVERVIEW

Official designation: Allen-Bradley 140U-D6D3-B30 (Bulletin 140U, Molded Case Circuit Breaker)

Role/Application: D-Frame circuit breaker providing fixed thermal and fixed magnetic overcurrent protection for industrial feeder and branch circuits, featuring current limiting capability and a compact design.

KEY SPECS SUMMARY

Power: 480 Volts AC supply voltage

Interfaces / Ports: Screw terminals, 1 to 6 mm2 wire

Indicators: None visible (internal trip mechanism)

Operating Temp: Minus 25 to plus 60 degrees C

Platform / Compatibility: Bulletin 140U product line, D-Frame

Limit: 3 Amperes rated current

Lifecycle: Refer to the latest manufacturer manual.

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the trip setting for the fixed magnetic protection in the 140U-D6D3-B30?

A: The magnetic trip is fixed at 10 times the rated current, which is 30 Amperes.

Wiring & Installation:

Q: What type and size of wire are recommended for connecting the 140U-D circuit breaker terminals?

A: Use 75 degrees C copper wire only, with a recommended range of 1 to 6 square millimeters.

Troubleshooting & Compatibility:

Q: Is this 140U breaker rated to operate at 100 percent of its continuous current rating?

A: This D-Frame breaker is 100 percent rated up to 10 Amperes of continuous current.

Replacement & Upgrades:

Q: Can the 140U-D6D3-B30 be replaced with a breaker that has adjustable protection settings?

A: Yes, the Bulletin 140U series includes models with adjustable thermal and adjustable magnetic trip settings.