Federal Pacific XJL434125 Molded Case Circuit Breaker

This XJL frame breaker is designed exclusively for legacy Federal Pacific switchgear and panelboards. It provides a direct drop-in replacement to maintain existing FPE electrical systems without requiring a complete panel upgrade.

The XJL434125 utilizes Federal Pacific's Fusematic technology, which combines standard thermal magnetic trip elements with internal current limiting fuses. This hybrid design allows the breaker to achieve high interrupting ratings, such as 150kA at 480VAC, by safely clearing massive fault currents.

No, the thermal protection for long-time overloads is fixed. However, the magnetic instantaneous trip function is adjustable, allowing panel builders to fine-tune the short-circuit response to accommodate specific inrush currents or downstream load requirements.

The line side features a bolt-on configuration for direct attachment to the panel busbars. The load side is equipped with mechanical lugs for terminating the outgoing phase conductors.

Yes. Federal Pacific Electric (FPE) XJL frame breakers are physically and electrically identical to those branded under American or Federal Pioneer. The XJL434125 can directly replace equivalent 125A XJL breakers from these legacy nameplates.

Current limiting breakers clear high-magnitude short circuits in less than half a cycle. By drastically reducing the peak let-through current and thermal energy, they prevent severe mechanical stress and thermal damage to downstream conductors and equipment.