Square D ME36800LI Molded Case Circuit Breaker

This breaker features an I-Line style plug-in connection, making it compatible exclusively with Square D I-Line panelboards and switchboards. It mounts directly onto the interior bus structure.

The legacy ME frame has been retired by Schneider Electric. The direct modern equivalent is the PowerPact MJA36800, which offers the same 800A capacity, 3 pole configuration, and I-Line mounting style for seamless retrofitting.

The LI suffix designates an electronic Micrologic trip unit with adjustable Long-Time and Instantaneous settings. This enables you to dial in specific overload pickup levels and instantaneous short-circuit trip points to properly coordinate with other devices in the electrical distribution system.

The factory-installed load lugs are designed to terminate up to three conductors per phase. Each individual lug port accepts aluminum or copper wire ranging from 3/0 AWG to 500 kcmil.

I-Line circuit breakers feature integrated line-side jaws that plug and bolt directly onto the panel busbars. This eliminates the need to measure, cut, strip, and torque individual line-side cables, significantly speeding up panelboard integration.

No. The solid-state Micrologic trip unit is self-powered. It utilizes internal current transformers to generate the necessary operating power directly from the primary current flowing through the circuit breaker.

No. Electronic trip breakers typically require the line power to enter the designated line terminals to properly power the trip unit. Additionally, the physical I-Line plug-on configuration dictates that the breaker must receive power from the panel bus.

The ME36800LI is rated for a robust 65kA interrupting capacity at 240V and 480V. However, if applied in a 600V system, the interrupting rating drops to 25kA. You must verify that the available fault current at the installation point does not exceed 25kA for 600V applications.