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The SQDLLA36400U44X is a Square D 3-Pole 400 Amp LSIG Circuit Breaker, designed for robust protection in demanding environments. Operating at 600V, it features a thermal-magnetic trip mechanism, providing advanced overload and short-circuit protection. Ideal for industrial applications, this reliable breaker ensures optimal performance and safety in your electrical systems.
LSIG stands for Long-time, Short-time, Instantaneous, and Ground-fault protection — four independently adjustable trip functions built into the electronic trip unit. This gives engineers precise control over coordination with upstream and downstream devices, making it ideal for complex industrial distribution systems where selective coordination is required by code or engineering design.
The LLA-frame series with U44X trip units can be difficult to source through standard distribution channels. Northern Breaker Group specializes in exactly these hard-to-find and obsolete Square D MCCBs. Contact us or request a quote — we can advise on availability and, where applicable, tested replacement options.
Yes — at 400A, 600V, 3-Pole with LSIG protection, this breaker is well suited for use as either a main disconnect or a feeder breaker in industrial panelboards and switchboards rated for LLA-frame devices. Always verify the panelboard's bus rating, interrupting capacity requirements, and applicable CEC rules with your electrical engineer before installation.
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