Vanguard Thermosonic resetting

i have a Vanguard Thermosonic V5-40FT heat detector that was tripped when i got it and i don’t know how to reset it. does any one know anything about this detector as there is no info, just pictures, online.

Have you tried pushing the fuse (a circular gold disk) back onto the detector’s central trigger pin? That’s the only thing I can think to do.