DC Relay overrated for max. 100ms
In-rush current is a killer for contacts in relay (and elsewhere).
A short current spike during operation, when the relay is properly closed might be tolerable (ask the manufacturer).

In-rush current on the other hand is much worse: It starts flowing at the very first instant the contacts barely close. Usually contacts bounce for a short moment, causing a current arc and extensive heating of the contacts. 
The same holds true for high currents when switching off the relay (i.e. when shutting down an inductive load).

As a result, the rating of relays are typically for resistive loads only. As soon as the load gets capacitive or inductive, the allowable limits are much lower.