Siemens Q39000S01 U Three Phase AC Contactor 90A

Siemens Q39000S01 U is a three‑pole molded‑case circuit breaker (MCCB) in the Q Series, rated for 90 A at 240 V AC and designed to protect 3‑phase circuits in commercial and industrial panel installations. It provides a 10 kA interrupt rating at 240 V (10 kAIC), enabling robust fault protection for feeders and motors in distribution gear. The unit is a plug‑in MCCB with Insta‑Wire quick‑connect wiring, and the family supports thermal‑magnetic trip operation; some variants also offer a shunt‑trip accessory for remote disconnection at 120 V. Typical applications include protecting 3‑phase feeders and motor circuits in switchgear, panelboards, and service equipment where a compact, 90 A protective device is required in 240 V systems.