Surge protectors do have indicator lights on them. It varies by brand and style of unit how many lights there are and what each of them indicates. Some surge protectors will say on the unit what each of the lights indicates and what it means if the lights are on or off. So, it is important to check your surge protectors on a regular basis.
A large surge can damage the surge protector while it trips the breaker, so in addition to regularly checking the surge protector, it is important to check it any time you reset a tripped breaker.
