Square D FH36015 Molded Case Circuit Breaker

This breaker is designed specifically for Square D I-Line panelboards and switchboards. It utilizes a plug-on I-Line connection that mounts directly to the internal bus stack.

No. The FH36015 requires an I-Line bus structure. It is not compatible with NQ, NF, QO, or Homeline panelboards.

As an F-frame I-Line breaker, it requires 4.5 inches of vertical mounting space on the panelboard bus, which equates to 1.5 inches per pole.

The breaker features plug-on jaws that push onto the bus stack. It is then mechanically secured to the panelboard backpan using a built-in retaining bracket and screw.

Yes, the FH36015 shares the same physical dimensions and I-Line mounting as the FA36015. It also offers a higher interrupting rating (25kAIC at 480V compared to the FA model's 18kAIC), making it a suitable upgrade or replacement.

The modern replacement is the PowerPact H-frame series. To meet or exceed the 25kAIC at 480V rating of the FH36015, the HGA36015 is recommended, as it provides 35kAIC. The HDA36015 is physically compatible but only rated for 18kAIC at 480V.

Yes, it carries a DC rating of 250VDC with a 10kA interrupting capacity, allowing it to be used in compatible direct current applications.

The LI designation means the breaker includes Long-Time and Instantaneous trip functions. Long-Time protects against sustained overloads, while Instantaneous provides immediate tripping during severe short circuits.

No. The FH36015 uses a fixed thermal magnetic trip unit. The overload and short-circuit trip points are factory calibrated and cannot be modified by the user.