800 A at 600 VAC with an 18 kA interrupting rating places this in the heavy industrial feeder or large motor branch circuit class. The electronic trip unit gives adjustable long-time, short-time, and instantaneous pickup — not a fixed thermal-magnetic curve — so coordination studies can be tuned without swapping the breaker. The copper lugs accept cable sizes appropriate for 800 A; the lugs-off-end termination means the line and load conductors enter from the same side, which simplifies bus-stack layout in a unit mount switchboard.
Integration note
Unit mount breakers bolt directly to a panel or switchboard bus — no DIN rail, no plug-in base. The MGP36800LC occupies a 3-pole footprint; verify the mounting hole pattern and bus spacing against your existing switchboard. Copper lugs off end: the lug tunnel faces the cable entry direction, so plan the gland plate and bend radius accordingly. Single unit per package.