Siemens Q31500S01U Three-Phase Contactor

Siemens Q31500S01U is a Q Series low‑voltage molded‑case circuit breaker (MCB) engineered for dependable 3‑phase protection in 120/240 VAC distribution systems. This 3‑pole device is rated for 15 A continuous load and provides a 10 kA interrupt rating, enabling safe disconnection of fault currents up to 10,000 A at the rated voltage. It features Insta‑Wire terminals for quick, reliable field wiring and a dual‑mode trip system that combines thermal‑magnetic protection with an optional shunt‑trip configuration for remote or automatic control. Designed for panelboard and distribution applications, the Q31500S01U fits legacy ITE/QP installations and other 3P Siemens setups where compact, precise overcurrent protection is required. Typical use cases include motor circuits, lighting feeders, and general three‑phase branch circuits in commercial or industrial panels, where a compact 3P 15A breaker with a robust interrupt rating and reliable trip characteristics is advantageous.