Square D FIL36040 Molded Case Circuit Breaker

The standard factory lugs accept 14 AWG to 1/0 AWG copper or aluminum wire. Ensure proper torque specifications are followed during installation as outlined on the breaker faceplate.

This unit mount F-frame breaker is designed for use in Square D switchboards, motor control centers, and individual enclosures. It is a feed-thru breaker that bolts directly to the mounting surface and is not designed to plug onto standard load center busbars.

The FIL36040 is a unit mount, feed-thru circuit breaker. It bolts directly to the mounting surface or enclosure backpan rather than plugging onto a busbar, and uses standard lug connections for both the line and load sides.

No, this breaker features a fixed thermal and fixed magnetic trip unit. The long-time and instantaneous trip functions are factory set and cannot be adjusted in the field.

The FIL36040 is part of the legacy Square D F-frame series. For modern upgrades, Schneider Electric recommends the PowerPact H-frame series, such as the HLL36040, depending on your specific mounting and accessory requirements.

Yes, the 600VAC maximum voltage rating means it is fully compatible with lower voltage systems, including 240VAC and 480VAC. The breaker provides a 200kA interrupting rating at both 240V and 480V, and 100kA at 600V.

The LI designation indicates that the thermal magnetic trip unit provides Long-Time (L) and Instantaneous (I) protection. The long-time function protects against sustained overloads, while the instantaneous function immediately trips the breaker during a short circuit.

Current limiting breakers like the FIL36040 clear high-level short circuits in a fraction of a cycle. By extinguishing the arc quickly, they significantly reduce the let-through thermal energy and peak magnetic forces, protecting downstream wiring and equipment from severe damage during faults up to 200kA at 480V.