Two 1 Pole 30 Amp Breakers in one unit.
Zinsco Circuit Breaker 30A, 120V Green toggles, this breaker provides two (2) single pole 30 amp breakers in one unit. Zinsco was the original OEN manufacturer of this brand. These are obsolete and are only available in recondition. In the 1950's this was a very popular brand. They appear all over the USA in older homes, such as This Old House. In later years Sylvania purchased the brand, then later it was Challenger, then still it was Thomas & Betts. Today only a knock-off brand is made by Unique Breakers.