Eaton / Cutler-Hammer FS320100A Molded Case Circuit Breaker

This F-frame breaker is designed for Eaton Pow-R-Line panelboards, specifically the PRL3a and PRL4 series, as well as compatible switchboards. Installation requires the correct F-frame connector kits for either horizontal or vertical mounting.

Both are 100A, 3-pole, Series C F-frame circuit breakers with identical physical dimensions. The difference is their interrupting capacity. The FS320100A is rated for 22 kAIC at 240VAC, whereas the FD3100 provides a higher rating of 65 kAIC at 240VAC and 35 kAIC at 480VAC.

Yes, the standard lugs are rated for both copper and aluminum (Cu/Al) conductors ranging from 14 AWG to 1/0 AWG. Always apply an approved oxide-inhibiting joint compound when terminating aluminum wires and torque to the specifications printed on the breaker.

As a Series C F-frame breaker, it has a standard footprint of 6 inches in height, 4.13 inches in width, and 3.38 inches in depth. This consistent sizing allows it to easily replace older F-frame breakers without modifying the panel space.

While the FS320100A shares internal accessory compatibility with the rest of the Series C F-frame family, UL 489 standards require internal accessories like shunt trips and auxiliary switches to be factory installed to maintain the UL listing.

Yes, this breaker is UL rated for DC systems up to 250VDC with a 10 kAIC interrupting capacity. It is frequently installed in industrial DC control panels, battery backup systems, and solar applications.

No, this breaker features a fixed thermal-magnetic trip unit. Both the long-time overload (thermal) and instantaneous short-circuit (magnetic) trip points are factory set and cannot be modified in the field.

Yes, standard Eaton Series C F-frame thermal-magnetic breakers are HACR rated and suitable for reverse feed. They do not have line and load side restrictions, allowing power to be supplied from either direction.