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The LH36300 SQUARE D 3P 300A 600V circuit breaker is designed for reliable performance and safety in demanding applications. With a 25kA short-circuit rating, this three-pole breaker ensures superior protection for your electrical systems. Ideal for commercial and industrial use, it guarantees durability and efficiency in any environment.
The LH36300 uses Square D's I-Line plug-in mounting system, which is designed for Square D I-Line panelboards and switchboards. It is not compatible with residential loadcentres such as QO or Homeline panels. If you're unsure whether your board accepts I-Line plug-in devices at 300 A / 600 V, send us your panelboard model number and we'll confirm compatibility.
Availability of LH-frame breakers can vary, as some models in this series have been superseded by newer Square D MCCB frames. Northern Breaker Group specialises in obsolete and hard-to-find breakers across Canada — contact our Calgary, Edmonton, or Vancouver counters and we'll locate new, reconditioned, or surplus stock for you.
Yes. A 600 V rated breaker like the LH36300 is suitable for use on lower-voltage systems such as 208 V, 480 V, or 600 V three-phase applications, provided the ampacity (300 A) and interrupting rating (25 kA) meet or exceed your system's requirements. Always verify that the available fault current at the installation point does not exceed the 25 kA interrupting rating.
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