Q. What is the difference between the F4-08TRS-1 and -2?
A. All three part numbers are 8 Point Isolated Relay Output Modules but each has different current ratings and relay configurations.

F4-08TRS-1 - 10A/Point, 4 Form C relays, 4 Form A relays

F4-08TRS-2 - 5A/Point, 4 Form C relays, 4 Form A relays, User replaceable fuses

Q. Can I switch low voltage and low current signals through these relays?
A. If the relays have never switched high voltage or inductive loads then they can be used to switch loads as small as 10mA, otherwise a wiping current of 100mA minimum is required.