Eaton / Cutler-Hammer LB3400 Molded Case Circuit Breaker

This bolt-on molded case breaker is specifically designed for integration into Eaton Pow-R-Line 4 panelboards, Pow-R-Line C switchboards, and legacy Westinghouse CDP panelboards.

Yes. Eaton acquired both Cutler-Hammer and the legacy Westinghouse distribution equipment line. An LB3400 marked with any of these three brands shares the exact same AB-Deion L-frame dimensions and serves as a direct drop-in replacement.

For facilities looking to modernize aging infrastructure, the Eaton Series G LGE3400FAW is a common substitute. Verify your existing panel hardware and bus spacing before upgrading to ensure the Series G frame will fit properly.

The LB3400 features an LI trip profile. It provides fixed thermal protection for long-time overloads and adjustable magnetic protection for instantaneous short-circuit events, allowing electricians to coordinate the breaker with downstream loads.

The maximum fault current the breaker can safely clear decreases as system voltage increases. It provides a 42kA rating at 240VAC, 30kA at 480VAC, and 22kA at 600VAC. Always verify that the available short-circuit current at the panel does not exceed these thresholds.

Yes. While commonly used in 3-phase AC systems up to 600VAC, the breaker is also fully rated for DC circuits up to 250VDC with a maximum interrupting capacity of 20kA.

Standard frames often do not include lugs because terminal requirements vary based on conductor gauge and material. Compatible lug kits, such as the Eaton TA350K, must be selected and installed based on the specific wire size required for the job.

The LB3400 must be securely bolted directly to the bus assembly of a compatible switchboard or panelboard. The high-amperage bolt-on design prevents the thermal and mechanical stresses that would cause standard plug-on connections to fail.