Zinsco Q50N Single-Pole Circuit Breaker 50 Amp

The Zinsco Q50N 50 Amp single-pole circuit breaker is designed for Zinsco/GTE Sylvania load centers and 120V systems, using a plug-in mounting and a thermal-magnetic Magnatrip trip mechanism to guard against overloads and short circuits, making it compatible with legacy panels in older electrical installations. Operating on 120 VAC (120/240V class) with an interrupt rating of approximately 10 kAIC at 240V, the Q50N protects residential and light commercial circuits—such as electric heaters, large window-type air conditioners, compressors, and dedicated high-load receptacle circuits—where 50 A protection is required, with the trip system responding to both overloads and fault conditions. As a legacy Type Q series device, the Q50N is obsolete/discontinued, but surplus and aftermarket replacements remain available, including Connecticut Electric UBIZ50 1-Pole 50A Zinsco replacement, Siemens Q150 1-Pole 50A, and Square D QO150/HOM150 1-Pole 50A, which helps maintain compatibility with older panels.