Square D HJA36100 Molded Case Circuit Breaker

This circuit breaker is specifically designed for use in Square D I-Line panelboards and switchboards. It uses an I-Line style plug-on connection on the line side and cannot be installed in standard unit-mount enclosures, DIN rails, or NQ/NF series panels.

Yes, PowerPacT H-frame circuit breakers support a wide range of field-installable accessories. You can install components like shunt trips, undervoltage releases, and auxiliary switches directly under the front accessory cover without removing the breaker from the panel.

No, the HJA36100 features a thermal-magnetic trip unit with fixed long-time and fixed instantaneous (LI) settings. The magnetic hold current is 900A and the trip current is 1700A. If your application requires adjustable trip settings, you will need to select a breaker equipped with a Micrologic electronic trip unit instead.

The standard factory-installed mechanical lugs accept both aluminum and copper (Al/Cu) conductors ranging from 14 AWG to 3/0 AWG. Always apply a quality oxide inhibitor when terminating aluminum conductors and tighten them to the torque specifications printed directly on the breaker label.

The J indicates the interrupting capacity tier for this PowerPacT H-frame breaker. A J-tier rating provides 100 kAIC at 240 VAC and 65 kAIC at 480 VAC. If your system requires lower fault protection, you might cross-reference to the G-rated (HGA) or D-rated (HDA) versions.

Out of the box, this standard thermal-magnetic breaker does not provide equipment ground-fault protection. If ground-fault sensing is required for your installation, you must add a compatible Earth Leakage Module (ELM) or use an advanced breaker with a Micrologic trip unit that includes a G suffix for ground fault.