FI36040 SQUARE D 3P 40A 600V I LINE
The FI36040 Square D 3P 40A 600V I-Line circuit breaker is designed for reliable performance in demanding applications. With three poles and a 40-amp capacity, it ensures effective circuit protection in commercial and industrial settings. Its robust construction and compatibility with I-Line panelboards make it an excellent choice for your electrical needs.
The FI36040 uses Square D's I-Line plug-in mounting system, which is compatible with Square D I-Line panelboards and switchboards designed for that bus configuration. Because I-Line panels come in multiple frame and ampacity ratings, we recommend sending us your panelboard model number so we can confirm the FI36040 is the correct fit for your installation.
The FI-frame I-Line series has largely been superseded by newer Square D MCCB families. The FI36040 may be difficult to source through standard distribution channels. Northern Breaker Group specialises in obsolete and hard-to-find breakers, so contact us for current stock availability and lead times.
Yes — a 600V-rated breaker like the FI36040 can be applied in lower-voltage systems such as 480V or 208/120V, provided all other ratings (amperage, interrupting capacity, number of poles) are appropriate for the circuit. Always verify with your engineer or authority having jurisdiction (AHJ) that the breaker meets the full requirements of your specific application.
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