I've got a Crydom CKRD2420 SSR wired in series with a ABB S201-C6 circuit breaker, supplying power to a 1kW 240VAC heater. This is one of several identical lines, which are all supplied via a ABB S201-C16 circuit breaker.
The system worked great for a couple of months, but recently there was a short, and after hours of inactivity, as 0.1% of power was starting to flow, both the C6 and the C16 circuit breakers cut the power with a flash within a few seconds. This happened 2 or 3 times as I was trying to debug the system, and then the short became an open circuit (melted the heater).
The solid state relay works fine now that the load is fixed, but how can I be sure that it hasn't been weakened? I have read that the I²t of the relay must be higher than that of the breaker, but ABB's curves don't go any lower than 4000A unless I can't read the charts properly.