Eaton / Westinghouse HLA3600 Molded Case Circuit Breaker

This bolt-on L-frame breaker is designed to integrate directly into legacy Westinghouse panelboards, Eaton Pow-R-Line C panelboards, and compatible industrial switchboards without requiring custom mounting hardware.

Yes, the HLA3600 is the high-interrupting capacity (Mark 75) version of the standard LA frame. It shares the same physical dimensions and mounting footprint as the standard LA3600, allowing it to fit in the same panel spaces while providing a higher fault current rating.

The HLA3600 is a legacy Mark 75 L-frame breaker, whereas the HLD3600 is the newer Eaton Series C equivalent. If you are working in an older Westinghouse or Cutler-Hammer enclosure originally designed for the HLA or LA frame, using the HLA3600 eliminates the need to retrofit the panel mounting hardware to accommodate the newer Series C footprint.

It features an interchangeable thermal-magnetic trip unit. The thermal element provides fixed long-time overload protection, while the magnetic element is adjustable. This adjustability allows electricians to tune the instantaneous short-circuit pickup to properly coordinate with other protective devices in the system.

The standard mechanical lugs on this breaker accommodate two conductors per phase. They accept wire sizes ranging from 1 AWG up to 500 kcmil for both aluminum and copper conductors, making it suitable for parallel feeds in high-amperage applications.

No. The LI trip function code indicates that this breaker only provides Long-Time (thermal) and Instantaneous (magnetic) protection. It does not include the ground fault sensing capabilities found in LSIG or GFCI breakers.

The Mark 75 family designation indicates that this breaker is a high-interrupting capacity model. For the HLA3600, this provides a maximum interrupting rating of 75kA at 240VAC, which allows it to safely clear higher fault currents than standard LA-frame breakers.