PB‑96006‑3 is an Allen‑Bradley 1606‑XLS series switched‑mode power supply rated at 960 W with a 24–28 VDC output and a 380–480 VAC input. Common failure modes include degraded output voltage due to failed electrolytic capacitors or rectifier diodes, overheating from clogged ventilation or fan failure, and loss of regulation caused by damaged MOSFETs or control ICs; the unit may also exhibit intermittent operation if the AC inlet transformer has lost turns. First‑check diagnostics: verify that the 380–480 VAC input is within spec and that the supply’s internal fuse or circuit breaker is intact; measure the output voltage with a calibrated multimeter while the load is applied to confirm regulation; visually inspect for bulging capacitors, burnt components, or loose connections, and ensure the cooling fan is spinning and airflow is unobstructed.[oss-gpt-20b]