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The LH36400 Square D 3P 400A 600V I-Line Circuit Breaker offers reliable protection for your electrical systems with a 25kA interrupting capacity. Designed for commercial and industrial applications, this circuit breaker ensures optimal performance and safety. Ideal for heavy-duty use, trust Square D for durability and quality in your installations.
The LH36400 uses Square D's I-Line plug-in mounting system, which is specific to I-Line panelboards and switchboards. PowerPact H-frame breakers use a different bus-connection system. While both are 400 A molded-case breakers, they are NOT directly interchangeable — always verify the mounting system of your panelboard before substituting one for the other. Contact us if you need help identifying the right replacement.
Square D has transitioned many LH-frame I-Line breakers to the PowerPact line. If the LH36400 is discontinued or hard to find through standard channels, Northern Breaker Group specialises in sourcing obsolete and hard-to-find breakers across Canada. Contact our Calgary, Edmonton, or Vancouver counters for current availability and to request a quote.
Yes — the LH36400 is rated for 600 V AC, making it suitable for Canada's standard 347/600 V three-phase, 4-wire commercial and industrial distribution systems. Always confirm that the interrupting rating of 25 kA meets or exceeds the available fault current at the point of installation, as required by the Canadian Electrical Code (CEC).
