Worked as a replacement for the Crouse-Hinds circuit breaker. It wasn't an exact match, but it did fit into the appropriate slot that required a left hook. The old light switch was on its last legs as the lights were dimmed from time to time. Easy to replace, but due to the design, removing the old switch is a bit more difficult. But this one seemed new. I don't know what a repaired or repaired switch would have looked like, but there were no obvious signs of wear. One star removed due to slightly imperfect fit and doesn't quite match the crouse-hinds switch. But I'm glad Revain has it and can get it that same day.