Hi PrL,
These solid state relay units are principally for use where the
input has to be isolated from the output, that is where two
systems are independent with no common wiring.
The voltage drop you refer to is in the output side and is a
maximum at full current. Very often the drop incurred is less
than the maximum given by the manufacturers.
This device will not be expecting to handle a current in excess
of 1.0 Amperes. Its normal operating range is intended to be
between 0.2 Amperes and 1.0 Amperes. However, it is rated to cope
with up to 5.0 Amperes for one second, no longer. So if your load
is inductive, then check it out carefully, those ratings reflect
typical changes in filament lamps, which take more current when
cold, and less current when running. Inductive loads normally
have a much higher surge factor, inductive loads also give a 'kick'
when switched off depending on how much current is moving at the
moment of switching off. This 'kick' can be quite a spike so if
an inductive load is intended for this device then appropriate
quenching should be considered.
From your description of the use you intend for this device, you
will be using a switch to operate it, presumably from the 12 volt
supply that will operate the lamp. (through a suitable resistor)
Since this device could only handle 1 Ampere, the max lamp would be
12 Watts.
Have you considered an ordinary relay, or maybe running the lamp
through the switch ?
Accompanying is a data sheet on the DO061B
Best of luck with it, John