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The MJA36400 Square D 3P 400A 600V 25KA I-Line is a durable and efficient circuit breaker designed for commercial and industrial applications. This three-phase breaker ensures reliable protection and performance with a high breaking capacity of 25kA. Perfect for upgrading electrical systems, it meets stringent safety standards for optimal functionality.
The MJA36400 uses Square D's I-Line plug-in bus system, so it requires a compatible Square D I-Line panelboard or switchboard rated for 600V and capable of accepting a 400A, 3-pole I-Line breaker. It will not fit QO or Homeline residential loadcentres. Contact us with your panelboard model and we can confirm compatibility.
The Square D MJA frame series is considered obsolete or hard-to-find through standard distribution channels. Northern Breaker Group specialises in sourcing exactly these types of discontinued and legacy breakers for Canadian customers. Reach out to our Calgary, Edmonton, or Vancouver counters or request a quote online and we'll check current stock.
Yes — at 400A and 600V with a 25kA interrupting rating, the MJA36400 is appropriate for use as either a main disconnect or a large-feeder branch breaker within an I-Line switchboard or panelboard, depending on the system design. Always verify the application with a licensed electrician to ensure compliance with the Canadian Electrical Code (CEC).
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