Square D HJA36100U33X Molded Case Circuit Breaker

It serves as an ideal upgrade for older, discontinued Square D 100A F-Frame I-Line breakers, such as the FA36100, FH36100, and FC36100. The modern H-Frame occupies the same I-Line bus space while providing more advanced electronic trip protection.

This circuit breaker features an I-Line plug-in line connection and is designed exclusively for use in Square D I-Line panelboards and I-Line switchboards.

LSI provides advanced electronic protection: Long-Time (overload protection), Short-Time (delayed short-circuit protection for system coordination), and Instantaneous (immediate tripping during a severe short-circuit fault).

In the Square D PowerPacT nomenclature, "U33X" indicates that the breaker is equipped with a Micrologic 3.2S electronic trip unit, which features standard LSI protection functions.

No, this standard model is rated for 80% continuous current. For a 100% rated application, the catalog number would need to include a 'C' suffix (e.g., HJA36100CU33X), which also requires specific enclosure sizes and 90C rated conductors.

The factory-installed mechanical load lugs (part number AL150HD) on this breaker accept a wire range of 14 AWG to 3/0 AWG for either aluminum or copper conductors.

Yes, the Square D PowerPacT H-Frame design features current-limiting construction. This reduces peak let-through current and let-through energy during a short-circuit event, helping to protect downstream conductors and equipment from severe damage.

Yes. The Micrologic 3.2S trip unit features adjustable rotary dials on the face of the breaker. This allows you to fine-tune the long-time pickup (Ir), short-time pickup (Isd), and instantaneous pickup (Ii) levels for precise system coordination.