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Both I/O modules have channel-to-channel isolation and carry a lifetime warranty.  Learn lots more about them in the [HART SNAP I/O module topic page](http://www.opto22.com/lp/hart_snap_modules.aspx). ### Switch a bigger load With this [SNAP mechanical power relay output module](http://www.opto22.com/lp/snap_mechanical_relay_modules.aspx), you can switch loads up to 6 amps at 250 VAC or 30 VDC, right from the same SNAP PAC rack you use for other analog, digital, and serial signals. The SNAP-OMR6-C has four mechanical contacts, each switching AC or DC power, and each can be wired as normally open or normally closed.  Here's more information in the [SNAP mechanical power relay module topic page](http://www.opto22.com/lp/snap_mechanical_relay_modules.aspx). ### And more... [![Find Opto 22 Topic Pages](https://blog.opto22.com/hs-fs/hubfs/OptoNews/topic_pages_link_332x267.png?width=280&name=topic_pages_link_332x267.png "Find Opto 22 Topic Pages")](http://www.opto22.com/lp/index.aspx)Check out all our [Topic Pages](http://www.opto22.com/lp/index.aspx), each one focused on one subject, like these: - [5 Tips for Energy Monitoring](http://www.opto22.com/site/5_tips_energy_monitoring.aspx)—and a [3-phase power-monitoring module](http://www.opto22.com/lp/power_monitoring.aspx) to help you do it - [Self-Training Guide](http://www.opto22.com/lp/self_training_guide.aspx) to SNAP PACs and I/O - [Pre-built enclosures](http://www.opto22.com/lp/enclosures.aspx)—easy installation, protection for your system - [PID loop control](http://www.opto22.com/lp/pid.aspx)—what it is and how to do it - And lots more! Find Topic Pages from any page on Opto22.com. Just scroll down to the bottom-right corner of the page and click the link. [![See all the Topic Pages](https://hubspot-no-cache-na2-prod.s3.amazonaws.com/cta/default/439485/bc10e71b-ae12-4e1b-84ed-afad043a42cd.png)](https://hubspot-cta-redirect-na2-prod.s3.amazonaws.com/cta/redirect/439485/bc10e71b-ae12-4e1b-84ed-afad043a42cd) Topics: [Energy management](https://blog.opto22.com/optoblog/topic/energy-management), [Process control](https://blog.opto22.com/optoblog/topic/process-control), [optonews](https://blog.opto22.com/optoblog/topic/optonews), [I/O](https://blog.opto22.com/optoblog/topic/io), [HART](https://blog.opto22.com/optoblog/topic/hart), [OptoNews 2015-08-26](https://blog.opto22.com/optoblog/topic/optonews-2015-08-26) ### Written by [Jean Femia](https://blog.opto22.com/optoblog/author/jean-femia) Jean Femia writes about technical subjects and has focused on automation and control systems for more than 15 years. She likes learning about technology and taking corners in her Honda S2000. 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