This 3-channel relay card is used to expand the Solo with relay ports.
Ports 1 and 2 have just normally open and common contacts, whilst Port 3 has normally open, normally closed and common contacts.
All relays are rated at 30VDC 1A.

The card is supplied with 2 x 4-pin spring terminal connectors.
The pinout, from top left to bottom right, is as follows:

1. P01 COM
2. P01 NO
3. P02 COM
4. P02 NO
5. P03 NO
6. P03 COM
7. P03 NC
8. P03 COM

NO = Normally Open
NC = Normally Closed
COM = Common