Siemens B00MN64 Bell Alarm Switch

Siemens B00MN64 Bell Alarm Switch is a Sentron accessory that adds audible or remote warning signaling to MD, ND, PD, or RD frame molded‑case breakers. Designed to energize a customer‑supplied bell or warning device when the associated breaker trips, it provides a dedicated 480 VAC alarm pathway (250 VDC in DC configurations) for alert applications in industrial and commercial equipment. The alarm switch kit is rated for 480 VAC line voltage and 250 VDC under specified configurations, and is compatible with Siemens MD/ND/PD/RD low‑voltage frames. The unit measures about 4 in long, 6 in wide, and 7 in high, and is rated for operation at 50/60 Hz with a 40°C temperature rating. Catalog numbers indicate configurations: B00MN64 is the alarm switch itself; A01MN64B adds one auxiliary switch; A02MN64B adds two auxiliary switches, enabling expanded signaling options. This accessory is commonly used to trigger a customer‑supplied audible or visual device following a breaker trip, helping facilities meet safety or process‑alarm requirements without modifying the primary protection scheme.