FXD63B250

The Siemens FXD63B250 is a ‑pole,  amp thermal‑magnetic molded‑case circuit breaker from Siemens’ Sentron Series designed for dependable overcurrent protection in 120/240 VAC branch circuits. As part of the FXD line, this breaker is engineered for use in Siemens load centers and panelboards where compact, reliable protection is needed for general purpose circuits such as lighting, receptacles, HVAC control circuits, and other moderate loads. The dual‑pole design ensures both ungrounded conductors are simultaneously disconnected on overload or fault conditions, supporting NEC requirements for multi‑wire branch circuits and enhancing safety.

Electrically, the FXD63B250 utilizes a thermal‑magnetic trip mechanism that combines heat‑sensitive overload protection with a magnetic instantaneous trip response for fast fault clearing. This dual‑element approach allows the breaker to tolerate normal inrush currents—such as those from motors or transformer energizing—while still rapidly interrupting short‑circuit faults. It is UL 489 listed and rated for a {aic rating} interrupting capacity. The  amp continuous current rating places the breaker in a category suitable for mid‑range branch circuits requiring dependable protective performance.

Mechanically, the FXD63B250 features a compact molded case with a manual toggle actuator for straightforward ON/OFF control and reset after a trip event. Its plug‑in mounting design enables quick installation into compatible Siemens panelboard bus systems without additional hardware, simplifying both new installations and maintenance replacements. The breaker accommodates standard conductor sizes appropriate for its amp rating (often #14–#8 AWG copper or aluminum, per Siemens specifications) and integrates with available Siemens accessory options, such as handle ties and auxiliary contacts where needed. The Siemens FXD series has a long history of proven performance in residential and light commercial distribution applications where reliable, code‑compliant protection is essential.

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