That looks identical to this Leadshine item.

151414015351

Leadshine has a good reputation for stepper drivers.   They also make a 
120 VAC input stepper driver with 8+ amps of output.

If you have the time to wait you can get some bargains directly from 
China suppliers.

Dave


On 1/15/2015 9:40 PM, Kirk Wallace wrote:
> I just received one of these (2.5 weeks from China) as a possible
> replacement for my unipolar driver that keeps blowing out transistors:
> http://www.ebay.com/itm/331393094727
>
> The original drivers run at 45V and 8 amps, with NEMA42 motors with 2.5
> Ohms per coil. The new driver can run at somewhere around 100V and 7.2
> amps and the motor is wired for 5 Ohms bipolar. I did a brief test at
> 50V and a setting of 5 amps (1/4 stepping), with the sample stepper
> config, and so far so good. The original drivers make the motors sing,
> but this one is silent (except for the steps). There are no specs on the
> signal timing, so I'll need to play with this, as well as try the
> maximum amp setting at 7.2, and upping the voltage to 100V. I may need
> to get more to do Y and Z.
>
> If anyone has used these drivers with NEMA42 motors and has any addition
> information or advise, please let me know.
>
> One thing that comes to mind. I looks like there is no overload
> protection, such as a power input fuse or breaker. It would seem prudent
> to add a fuse.
>

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