Square D HLA36125 Molded Case Circuit Breaker

This breaker is designed exclusively for Square D I-Line panelboards and switchboards. It mounts directly to the interior busbar stack using an integrated plug-on connection with a standard ABC phase arrangement.

As a 3-pole PowerPacT H-Frame circuit breaker, it occupies 4.5 inches of vertical mounting space on the I-Line bus stack.

In the Square D PowerPacT nomenclature, the "L" designates the specific interrupting capacity class. For the H-Frame series, the L-class provides a high-tier interrupting rating of 100kA at 480VAC and 125kA at 240VAC.

Yes. Because the HLA36125 has a high 100kA at 480V interrupting capacity, it can safely replace similarly configured 125-amp I-Line breakers with lower short-circuit ratings, such as the HDA36125, HGA36125, and HJA36125.

No. Because this is an I-Line breaker, the line side uses a plug-on jaw assembly that attaches directly to the panelboard bus. Mechanical lugs are only provided on the load side, which accept 14 to 3/0 AWG copper or aluminum wire.

No. This specific breaker model features fixed thermal and fixed magnetic trip elements. It provides standard Long-Time (L) and Instantaneous (I) overcurrent protection that cannot be modified in the field.

Yes, PowerPacT H-Frame breakers include a built-in push-to-trip button located on the front cover. This allows you to manually trip the breaker for safety testing and routine preventive maintenance without needing to apply a fault current.

When a fault occurs, the breaker handle moves to a center tripped position. To restore power, you must first push the handle completely to the "OFF" position to reset the internal toggle mechanism, and then push it firmly back to the "ON" position.

Yes, the PowerPacT H-Frame design supports various field-installable internal accessories. Auxiliary components like shunt trips, alarm switches, and undervoltage releases can be installed securely under the front cover.