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The FH36070 Square D 3P 70A 600V I-Line Circuit Breaker is designed for reliable protection in commercial and industrial applications. This three-pole breaker offers maximum current capacity of 70 amps, ensuring optimal performance. Durable construction enhances longevity, while easy installation makes it a perfect choice for your electrical needs.
The FH36070 uses Square D's I-Line plug-in mounting system, making it compatible with Square D I-Line panelboards and switchboards designed for that bus system (e.g., NF and NQ series). It is not suitable for QO or Homeline residential loadcentres. If you're unsure whether your panel accepts I-Line FH-frame breakers, send us your panelboard model and we'll confirm.
Availability can vary as Square D periodically updates its MCCB product lines. Northern Breaker Group specializes in obsolete and hard-to-find breakers, so even if the FH36070 is no longer in current production, we can often source new-old-stock or factory-refurbished units. Contact our Calgary, Edmonton, or Vancouver counters for current stock and lead times.
The 18kA rating is the breaker's short-circuit interrupting capacity at 600V — meaning it can safely clear fault currents up to 18,000 amps. Per Canadian Electrical Code (CEC), your breaker's interrupting rating must meet or exceed the available fault current at the point of installation. If your system's available fault current exceeds 18kA, you would need an FH-frame breaker with a higher interrupting rating. A qualified electrician or engineer can perform a short-circuit study to confirm suitability.
