Built for heavy-duty power distribution, the Siemens FJ63B110 is a 110A, 3-pole molded case circuit breaker. It provides essential LI trip functions for commercial facilities. Designed for bolt-on mounting, this unit fits perfectly into Siemens P1, P2, and P3 panelboards, along with SB switchboards and legacy I-T-E F-Frame enclosures. It can be replaced by the newer FXD63B110 model. The breaker features a 25kAIC rating at 240VAC and includes load side lugs.
Which panelboards and switchboards are compatible with the FJ63B110?
This breaker is designed for use in Siemens P1, P2, and P3 panelboards, as well as SB switchboards. It is also backward compatible with legacy I-T-E F-Frame panelboards.
What wire sizes are accepted by the lugs on the FJ63B110?
The factory-installed lugs accept wire gauges from 6 AWG up to 350 kcmil. They are rated for both copper (Cu) and aluminum (Al) conductors.
Does the FJ63B110 feature an adjustable trip unit?
Yes, it utilizes a thermal magnetic trip unit with a fixed thermal element for long-time overload protection and an adjustable magnetic element for instantaneous short-circuit protection.
Can I use the FJ63B110 to replace an older I-T-E 110A F-Frame breaker?
Yes. Siemens acquired I-T-E and continued the F-Frame product line. The FJ63B110 serves as a direct bolt-on replacement for legacy I-T-E breakers with the same frame size and specifications.
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