OVERVIEW

Official designation: Allen-Bradley 140U-H6C3-C30-MB (Bulletin 140U, Molded Case Circuit Breaker)

Role/Application: H-Frame, 3-pole MCCB rated 30 Amperes. It provides fixed thermal and fixed magnetic protection for branch and feeder circuits and is classified as current-limiting.

KEY SPECS SUMMARY

Power: 480 Volts AC maximum

Interfaces / Ports: End cap bolt-on terminals

Indicators: Trip status flag

Operating Temp: Minus 25 to plus 60 degrees C

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

Limit: Interrupting rating 65 kA at 480 Volts AC

Lifecycle: Discontinued, replacement 140G

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the fixed magnetic trip setting for this 30 Amp H-Frame MCCB?

A: The fixed magnetic trip is typically set at 10 times the rated current, which equals 300 Amperes.

Wiring & Installation:

Q: What is the maximum temperature rating for the copper wire conductors used with this breaker?

A: The breaker is rated for copper wiring capable of withstanding up to 75 degrees C.

Troubleshooting & Compatibility:

Q: Does the -MB suffix indicate the inclusion of any factory-installed accessory contacts or features?

A: The -MB suffix typically indicates the breaker assembly includes a Busbar Mounting Base for installation.

Replacement & Upgrades:

Q: What are the primary advantages of upgrading from the older 140U to the newer 140G MCCB series?

A: The newer 140G series offers higher interrupting capacity and shares common accessories across frames.