avr_fred:
Your basic observational powers are severely lacking... it's a custom board with a very nice photo that had you spent 5 seconds observing said photo you could have clearly seen the relays are Omron G5T-1A. SPST 5A 250V AC.I wonder how many I2C relay boards you've ignored...
It looks like a nice board; I didn't research the relays, but did see the terminal strips.
https://www.tindie.com/products/jap/8-channel-relay-board-for-raspberry-pi-and-arduino/
8-Channel Relay Driver Shield | Freetronics
http://www.robotshop.com/en/8-relay-add-on-unipi.html?gclid=CjwKCAjwssvPBRBBEiwASFoVd9Yd3XgFJ5IHqgyWijOn4egQrfl2bRbUtkNqR1SVZ7KIpJOaHebMFhoCmEgQAvD_BwE
The first is Peter Jacobs of London; I wrote him Wed or Thursday via Tindie but have not heard back. The second I'd seen, but is a form factor unsuitable for this job. The third looks interesting. It is single power supply vs. many others that allow a separate relay supply. And it's not yet available.
If you know of others, please let me know.