Usually 3-5 Days. 45 Day Lowest Price - 100% Satisfaction Guarantee. The PS-REL AC Relay provides an alternate way of closing switch contacts. Instead of being operated manually like the RS-1, it is a relay that detects the presence of AC power and, in response, closes relay contacts that are wired to a terminal strip. It may be used with any of the Furman products mentioned in connection with the RS-1.