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The SQDLLA36400U33X is a robust Square D 3-pole, 400A circuit breaker designed for 600V applications. Featuring an advanced LSI function, this breaker offers precise protection against overloads and short circuits, ensuring optimal safety and efficiency for your electrical system. Ideal for commercial and industrial settings, it meets high-performance requirements.
LSI stands for Long-time, Short-time, and Instantaneous — three independently adjustable trip protection bands. Long-time protects against sustained overloads, Short-time allows brief high-current events (like motor starts) without nuisance tripping, and Instantaneous responds instantly to severe fault currents. This combination gives you precise, field-adjustable protection coordination in commercial and industrial distribution systems.
Yes — Northern Breaker Group specialises in exactly this. The LLA-frame 400A 600V 3-pole is a known commercial/industrial breaker and we source both new and reconditioned units, including hard-to-find stock. Contact our Calgary, Edmonton, or Vancouver counter with your existing breaker's full nameplate details and we'll match it for you.
Yes. The LSI trip unit on the LLA-frame allows field adjustment of the long-time, short-time, and instantaneous thresholds (within the rated parameters). This is typically done during commissioning by a qualified electrician or electrical engineer to coordinate properly with upstream and downstream protective devices, in accordance with CSA C22.1 (Canadian Electrical Code) requirements.
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