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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:
NO = Normally Open
NC = Normally Closed
COM = Common