SSR model check

Hi, I'm looking to buy a SSR to control with my arduino mega 2560.

The arduino has an digital output of 5V (max 40mA).

The current to control is DC, ~4.2A at 30V.

I am looking to buy this one http://www.ebay.es/itm/Rele-estado-solido-Solid-State-Relais-SSR-Halbleiterrelais-40A-DC-to-AC-1-CANAL-/221370361351?pt=LH_DefaultDomain_186&hash=item338ab3a607&_uhb=1

Three questions.

  1. Is the arduino sufficient for the trigger current? Min off / on voltage: 2.4/1 V (below 5V so fine), but trigger current 7.5mA / 12V - does this translate to ~32mA at 5V (below the max)?

  2. The model controls an AC current by design. Will it work perfectly well with a DC current? (differing opinions exist online)

  3. If it's wrong, could you recommend an alternative?

Many thanks!

Ben

The datas below the picture says 3-32 V and 7 mA

That should be perfectly fine.....if you wanted to control AC!

For such a trivial DC problem, use a MOSFET instead.

Thank you Peter!

bpietras:
Thank you Peter!

You are welcome.

I've used IRL540 MOSFETs
http://www.vishay.com/docs/91300/91300.pdf

(Important: Make sure that you use a logic level MOSFET. If they need more than 5V at the gate, it complicates matters a little)

I think a SSR-10DA seems OK to control 30V DC at 4.2A.

I need to switch DC
If you only need to switch a small amount of current - 9 Amps or less, consider our compact, cost effective AC/DC SSRs.
If you need to switch more than 9 Amps, you need a serious DC SSR.

bpietras:
Wait, I only read up to the "perfectly fine" bit - for DC it's a no?
Because I found some sources Solid State Relay Guide - Phidgets Support that say

A "hockey puck" SSR, so named because of its thick shape and black color. They are specifically designed to switch either AC loads or DC loads, but never both.

"Either" being the word I liked there.

As far as I remember my English classes, "either-or" makes the discussed options mutually exclusive. Read what it says, and do not stop before reading "but never both"