What is this component? is it a solid state relay?

i want to know if it is a solid state relay. i got it in an old photocopier matsushita.

on the component it is written 
input    DC4~7v

it has 4 leads out. 2 small and 2 big. I googled it but no success
and if you know explain to me how this component works. it has  a large heatsink on the top

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The object in your blurry pictures is indeed a solid state relay. 

I could not find the exact data sheet for this SSR, but I found this which is similar:

The way it works is you put the leads labeled "output" in series with an AC source and an AC load.  

When you apply a DC voltage, in the range 4 to 7 volts, to the leads labeled "input", the magical silicon switch inside closes, and AC current flows to your AC load. 

See also:

ARJOON (author)  Jack A Lopez7 years ago
thank you but can i also drive a dc load with it
Regarding the question of switching a DC load:

It might turn on, but not turn off. If the switch is a TRIAC, basically two back-to-back SCRs, then it relies on the fact that the AC waveform to go zero periodically, to turn itself off.

Also note, in such a "stuck" turned on state, it will turn off if the current is interrupted, e.g. by opening another switch in series with the load, or just unplugging things.
kelseymh7 years ago
"I googled it but no success." You're kidding, right? Cut-and-paste, and the seventh hit gave the answer.
ARJOON (author)  kelseymh7 years ago
but i really did not see it anyway thank you
yup, I think he was kidding.