Eaton / Westinghouse LB3225 Molded Case Circuit Breaker

This legacy L-frame breaker is designed for installation in older Westinghouse panelboards, switchboards, and motor control centers. It serves as a direct bolt-on replacement for aging infrastructure, avoiding the complex retrofit kits required when upgrading to newer frame types.

The LB3225 features a thermal magnetic trip unit with a fixed thermal element for overload protection and an adjustable magnetic pickup. The magnetic setting can be dialed in to coordinate with downstream protective devices or to handle specific motor inrush currents.

The standard load side lugs accept #6 AWG to 350 kcmil conductors. Per UL 489 standards, these lugs are rated for 75 degrees Celsius. Ensure your wire sizing complies with NEC guidelines for this temperature rating.

No, the LB3225 is an obsolete legacy L-frame circuit breaker originally manufactured by Westinghouse and later by Eaton Cutler-Hammer. It is primarily sourced today as a direct replacement part to maintain existing electrical systems without modifying the panel bus.

Yes, this breaker features an interchangeable trip unit design. The factory installed thermal magnetic LI trip unit can be removed and replaced if a different trip calibration is required for your application, provided the replacement is compatible with the Westinghouse LB frame.

Yes, the LB frame supports internal accessories such as shunt trips, auxiliary switches, and undervoltage releases. These components are available for field installation, but they require opening the breaker housing and must be installed by experienced electrical technicians.