I have below shown ELCB of "legrand" being installed at my home. My home is with a single phased connection. Recently there was an incident that my mixie blown off its motor even when the supply was not there .. and there happened a spark in the power outlets where my mobile chargers were just plugged in. Mixie blown up its winding and charger is not working.
Then I checked if the ELCB was working by pressing the TEST button... but nothing happened.
I wonder if this is because of wrong connections to ELCB where it is not tripping when TEST button is pressed or because of a malfunction of the ELCB.
In the below picture, I find a total of four wires goes to the top and to bottom. The right end of it is written with letter 'N' which I think is for neutral wire connection.
I am not an electrician and totally blank about the way electricity works
. Can I be advised about this? (forgot to mention one thing - I think I remember this ELCB had tripped off once there was lightning)

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