Square D FA34020 3 Pole I-Line Circuit Breaker

Square D FA34020 is a 3-pole, 20-amp molded-case circuit breaker designed for 480 VAC service in I-Line panelboards, providing compact protection for 3-phase distribution circuits in commercial and industrial environments. This FA-frame MCCB uses a thermal-magnetic trip mechanism for precise coordination of overload and short-circuit protection and mounts in I-Line plug-on style, compatible with Square D Class 660/651 I-Line panelboards and switchboards. It delivers an 18 kA short-circuit interrupting rating at 480 VAC, accepts copper conductors from 14 AWG through 1/0 AWG and aluminum conductors from 12 AWG through 1/0 AWG, and occupies roughly 4.5 in W × 4.13 in D × 6 in H of space in the enclosure. The device is UL and CSA listed, designed for 3-phase protection with a plug-in design that simplifies panel maintenance and replacement while maintaining robust electrical safety in power distribution systems. Ideal for retrofit or new installations where a reliable, compact MCCB is required in 480 VAC circuits.