FA14045B SQUARE D 1P 45A 277V B PH I LINE

The FA14045B is an FA-frame plug-in molded-case circuit breaker designed for Square D FA-frame compatible panelboards and switchboards used in commercial and light-industrial applications. It is not designed for residential QO or Homeline loadcentres. If you're unsure whether it fits your specific panel, send us your panelboard model number and we'll confirm.

The 277V rating means this breaker is optimized for 277V AC circuits, which are common in commercial buildings running off a 480Y/277V three-phase, four-wire distribution system — typically used for fluorescent or LED lighting loads. While 277V is its rated voltage, it can generally be applied at lower voltages within its rating, but it is not a typical choice for standard residential 120/240V systems. Contact us if you need guidance on the right breaker for your specific application.

Northern Breaker Group specializes in obsolete and hard-to-find breakers, so even if the FA14045B is no longer in regular production, we can often source new-old-stock or factory-reconditioned units. Reach out to our Calgary, Edmonton, or Vancouver counters or request a quote online and our team will track down availability for you.