OPTO 22 G40DC5
The ODC5 output module is used for controlling or switching DC loads of 5-60 VDC. Each module provides 4000 volts (transient) of optical isolation between the field devices and the control logic.
Typical uses and applications for DC output modules include switching the following loads:
DC motor starters
DC lamps or indicators
Full Spec http://www.opto22.com/site/pr_details.aspx?cid=4&item=ODC5