Siemens B00FD64 Circuit Breaker With Alarm Switch

Siemens B00FD64 is a bell alarm switch accessory for Sentron FD-frame molded‑case circuit breakers, providing a local audible alarm when the connected breaker trips. Rated for 480 V AC and 250 V DC service, it is intended for use with low‑voltage FD‑frame MCCBs and supports 50/60 Hz operation in ambient temperatures up to 40 C. The unit measures about 5 in L x 5 in W x 4 in H, and carries catalog number B00FD64, with Siemens documenting it as a standalone alarm switch (the related C01FD64 combines an alarm and an auxiliary switch). The B00FD64 is offered as a standalone alarm switch, while the optional C01FD64 pairs the alarm switch with an auxiliary switch for additional signaling. It is positioned within the Siemens Sentron family and is specifically documented as compatible with FD-frame devices, with C01FD64 forming an alarm-plus-auxiliary switch assembly. Separately, B00FD64 is offered as the standalone alarm switch, while the C01FD64 option adds an auxiliary switch for expanded signaling.