Siemens Q1520 Plug-In Type QT Duplex Thermal Circuit Breaker

The Siemens Q1520 Type QT Duplex Molded Case Circuit Breaker is a plug‑in, two independent 120 V circuits in a single QT frame housing, rated 15/20 A with a 10 kA interrupt rating for reliable branch protection in Siemens load centers. Its thermal‑magnetic trip provides both overload and short‑circuit protection, and the unit includes a load lug terminal for straightforward wiring in 120 V circuits. As part of the QT duplex family, it is UL listed for frequent switching (SWD) and is intended for use in panelboards and load centers that list QT duplex plug‑in breakers. Verified by distributor catalogs, the Q1520 appears alongside other QT values (Q1515, Q2020, Q2030) as the 15/20 A option, and Siemens specifies its compatibility with standard QT frame installations, making it a direct replacement for existing QT duplex breakers. Common applications include protecting branch circuits in lighting, receptacles, and small-appliance circuits in residential and light-commercial installations.