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The BDA34040 Square D 3P 40A circuit breaker is designed for 480Y/277V systems with an impressive 18KA interrupting capacity. This reliable I-Line model ensures optimal performance and protection for your critical electrical applications. Suitable for commercial and industrial settings, it is a perfect choice for enhancing your electrical safety and efficiency.
The BDA34040 uses Square D's I-Line plug-in mounting system, which is compatible with Square D I-Line panelboards and switchboards rated for 480Y/277V commercial and industrial distribution. It is not interchangeable with QO or Homeline residential loadcentres. Share your panelboard model number with us and we'll verify the fit before you order.
The BDA frame I-Line series has been superseded by newer Square D MCCB families in some configurations. Availability can be limited, and the BDA34040 may be sourced as new old stock or a quality refurbished unit. Northern Breaker Group specialises in hard-to-find and obsolete breakers — contact us for current stock status.
The BDA34040 is rated for 480Y/277V grounded-wye systems. Applying it on an ungrounded 480V delta system requires careful review, as the interrupting and overvoltage characteristics differ. We recommend consulting your engineer of record and confirming the application with us before proceeding.
