Square D HDA36040 Molded Case Circuit Breaker

Yes. The Square D PowerPacT H-Frame series has replaced the legacy F-Frame breakers. The HDA36040 is the modern, direct functional replacement for the 40A FA36040 in I-Line panelboards.

The 'D' designates the interrupting rating tier of this PowerPacT H-Frame breaker. It indicates a maximum interrupting capacity of 18kA at 480VAC. Other available tiers include G, J, and L, which offer higher short-circuit interrupting ratings.

This breaker features an I-Line style plug-in connection. The line-side jaws mount directly onto the interior bus stack of compatible Square D panelboards and switchboards, while the load side uses standard mechanical lugs for wire termination.

No. This breaker is specifically built with an I-Line mounting style and will only fit Square D I-Line panelboards and switchboards. It is not compatible with QO, NQ, or NF series panels.

Yes, this I-Line circuit breaker comes standard with load-side mechanical lugs ready to accept 14 AWG to 3/0 AWG aluminum or copper wire. The line side requires no lugs as it connects directly to the panel bus.

No. This specific breaker features a standard thermal-magnetic trip unit with fixed thermal (long-time) and fixed magnetic (instantaneous) protection. If adjustable trip settings are required, you must select a breaker equipped with a MicroLogic electronic trip unit.

Yes, the HDA36040 is rated for 250VDC applications with an interrupting capacity of 20kA. Always verify your specific wiring configuration, such as series wiring of poles, based on manufacturer guidelines for DC circuits.