Challenger NB220 circuit breaker is a 2‑pole, 20 A, 120/240 V AC molded‑case breaker in the NB family (Stab‑Lok) designed to protect two hot legs in a split‑phase circuit. It carries a 10 kA interrupt rating at 240 V, making it suitable for residential or light commercial protection tasks in NB‑series panels. Some listings indicate a bolt‑on mounting variant in NB220 models, alongside the standard Stab‑Lok style for NB‑series installations. This NB220 unit helps provide reliable overcurrent protection for branch circuits such as lighting and receptacle runs within compatible Challenger/Schneider/ Federal Pioneer NB panels.
