Appliances may or may not have inline fuses, but that is no protection for a surge or brown-out condition. They only tend to blow if the appliance has an internal problem that draws excess current. The SSP30 and SSP50 surge protectors (the $100 variety) only protect against a power surge, not a brown-out/low voltage condition. To get that protection, and a better unit, you need to look at their EMS-HW or PT series of surge suppressors. Those cost considerably more.
I have the hardwired EMS-HW50C, with remote display, in my rig. Tells me how much current is being drawn on either leg, along with the line voltage. If there is/was a problem, it will display a code identifying the problem. Should there be a brown-out, it will shut down the power coming into the rig until it rises back to a predetermined safe level. Similar protection for a surge.
SurgeGuard is the other major brand of protectors. They also have hardwired and portable units. Functionally, they are probably very similar, but I don't think the hardwired SurgeGuard model has a remote display available. Their display is on the suppressor itself.