Commonly found in apartments as Main Breaker 1 2-Pole Breaker in 1 1-1/2 in. Space. Connecticut Electric manufactures new high quality replacement circuit breakers for Stab-Lok load centers that accept NA style circuit breakers. Circuit breakers should only be replaced with new tested and Safety Agency Listed circuit breakers. Used or refurbished circuit breakers should never be used.
California residents
Zinsco Replacement Circuit Breaker : QCAL2100
2 Pole breaker in a 1½“ body
Intertek ETL Listing to UL standard 489 for US and Canada-molded case circuit breakers