Control Switcher - Voltage Rating of Relays

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I’m going to be connecting a Fender Blues Deluxe Reissue to a Control Switcher (using a custom cable as described in another thread in this forum) and have read that the Blues Deluxe sends 30 VDC into the switch.

I was hoping someone could confirm what the relays in the Control Switcher are rated for? Is it safe to have the 30 VDC sent into the Control Switcher?

Thanks in advance!