Siemens BQD330 U Molded Case Circuit Breaker Three Phase

The Siemens BQD330U molded‑case circuit breaker is a three‑pole, 30 A device rated for 480 VAC, designed for panelboard mounting in 3‑phase distribution systems. It delivers a 14 kA short‑circuit interrupting capacity at 480 VAC and uses a thermal‑magnetic trip unit to provide precise overcurrent protection for feeders and motor circuits. Its compact 4 in wide by 3 in high by 4 in deep enclosure, panelboard‑mount configuration, and low‑tab electrical connection support straightforward integration into Siemens BQD/CQD switchgear and similar panelboard layouts, with operation suitable for ambient temperatures up to 40 °C. The BQD330U is UL 489, CSA‑C22.2, and IEC 60947‑2 listed, aligning with common North American and international electrical standards. Typical applications include protecting 3‑phase feeders and motors in commercial and light industrial distribution systems, where reliable overcurrent protection is required for 480 VAC networks.