Square D FC34030 Molded Case Circuit Breaker

This F-Frame breaker is designed specifically for Square D I-Line panelboards and switchboards. It uses a specialized plug-on connection that attaches directly to the I-Line bus stack.

No. I-Line breakers feature a built-in plug-on mounting assembly. The breaker jaws attach directly to the bus, and an integrated mounting foot secures the unit to the panel pan without requiring additional hardware.

The modern Square D PowerPacT equivalent is the HJA36030. It provides the same 30-amp rating, I-Line mounting, and a matching 65kA at 480VAC interrupting capacity. Verify that your specific panel layout can accommodate PowerPacT H-Frame dimensions before upgrading.

The standard mechanical lugs on this breaker are rated to accept copper wire from 14 to 4 AWG, or aluminum wire from 12 to 4 AWG.

Yes. The unit carries an HACR classification, meaning it is safety certified for use with heating, air conditioning, and refrigeration equipment branch circuits.

The thermal mechanism provides long-time delay protection against sustained circuit overloads, while the magnetic element delivers instantaneous tripping to protect the system during severe short circuits. Neither parameter is adjustable.

No. This is a commercial molded case circuit breaker. The large frame size and proprietary I-Line stab connections make it entirely incompatible with residential QO or Homeline load centers.

The 65,000 Ampere Interrupting Capacity (AIC) rating represents the maximum fault current the breaker can safely clear at 480VAC without failing or sustaining internal damage. This high interrupting threshold is designed for commercial and industrial distribution systems.