LGL36400CU31X – SQUARE D 3P 400A 600V

The Square D LGL is a larger molded-case circuit breaker frame rated for high-ampacity, high-voltage commercial and industrial applications — in this case 400A at 600V, 3-pole. It differs from smaller frames (like the QO or Homeline series used in residential panels) in its physical size, interrupting capacity, and the type of switchboard or panelboard it mounts into. Always confirm the frame size matches your enclosure's specifications before ordering.

The LGL-frame series is an older Square D MCCB line that can be difficult to source through standard distribution channels. Northern Breaker Group specializes in exactly these kinds of hard-to-find and obsolete commercial breakers. Contact us with your requirement and we'll advise on availability — whether new old stock, reconditioned, or a suitable modern equivalent.

A 400A, 600V, 3-pole MCCB like the LGL36400 can serve as either a main disconnect or a feeder/sub-feeder breaker, depending on how it is applied within your distribution system and your local electrical code requirements (Canadian Electrical Code, Part I). The specific application — main vs. feeder — will depend on your panel or switchboard configuration and any required interrupting capacity ratings. We recommend confirming the application details with your electrical engineer or authority having jurisdiction (AHJ).