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The SIEJD63T400 is a high-performance Siemens 400A JD frame trip that ensures reliable protection for your electrical systems. Designed for heavy-duty applications, this circuit breaker features advanced trip mechanisms for enhanced safety and precision. Perfect for commercial and industrial settings, it guarantees durability and efficiency in safeguarding your electrical equipment.
The 'T400' indicates this is a rating plug or internal trip unit set to 400A within the Siemens JD frame. JD-frame breakers often use interchangeable trip elements, meaning the physical frame may accommodate other ampere ratings — but the trip unit installed in this unit is factory-set for 400A. Always verify the trip rating matches your circuit's overcurrent protection requirements before installation.
The Siemens JD-frame series is a legacy MCCB line that has been largely superseded by newer Siemens 3VA and similar series. The SIEJD63T400 may be difficult to source through standard distribution channels. Northern Breaker Group specializes in obsolete and hard-to-find breakers — contact us for current stock availability and lead times.
A 400A JD-frame breaker can serve as a main disconnect or feeder breaker in a compatible industrial panelboard or switchboard, provided the equipment is rated for a JD-frame device at 400A and the installation meets applicable Canadian Electrical Code (CEC) requirements. Consult a licensed electrician and verify the panelboard's main-breaker slot specifications before proceeding.
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