These breakers are from a panel we replaced. No problem with it other than the breakers being discontinued and us planning some additional circuits. Each breaker has been tested for closed and open, but not trip amperage. The panel was mounted in a climate-controlled basement and the circuits saw normal amperage, very few trips over their life. I was careful when removing the breakers from the panel. The metal bus bar contacts and plastic retention bits are in excellent shape, none broken. The wire contacts and screws are likewise in excellent shape. Model SDT115 15A 1-pole 120V, model SDT120 20A 1-pole 120V, model SDT230 30A 2-pole 240V, model SDT250 50A 2-pole 240V.