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The SIEF63B100 is a reliable used Siemens 3P 100A circuit breaker, designed for 600V applications. This durable unit ensures optimal protection for your electrical circuits, offering both performance and safety. Ideal for various industrial and commercial settings, it represents a cost-effective solution for your circuit protection needs.
In most cases, yes — the SIEF63B100 is a bolt-on EF-frame MCCB and should serve as a direct replacement in panelboards designed to accept Siemens EF-frame breakers at 600V. However, we always recommend confirming your panelboard's exact frame and bus rating before installation. Send us your panel model number and we'll verify the fit.
Our used breakers, including this SIEF63B100, are inspected and tested to confirm proper mechanical and electrical operation before being offered for sale. They represent a cost-effective alternative to new units and are a practical solution for replacing obsolete or hard-to-find breakers. If you require documentation of testing or condition details, contact our team and we'll be happy to assist.
The Siemens EF-frame series is considered a legacy/obsolete product line, which makes sourcing new units difficult through standard supply channels. Northern Breaker Group specializes in exactly this type of hard-to-find breaker — our used and reconditioned inventory is a reliable source for EF-frame units like the SIEF63B100. Contact us for current stock availability.
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