Expansion Relay Board
(Item # 555) The Expansion Relay Board contains a 12 volt DC relay with double pole,
double throw (DPDT) contacts which is usable on its own as a relay or as an expansion
relay which plugs into the 2 pin connector of the OPTO-DT or the TRAK-DT family of current
sensing detectors to add extra contacts to those devices.
A 2 pin jumper cable is included for simple plug connection to other DALLEE ELECTRONICS
devices. For stand alone relay use, the 12 volt DC power can be inputed via the terminal
connectors on the board. |
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Relay Contacts - electrical diagramRelay contacts are used on most all of our Signaling Components. These are used since they are the most forgiving when mis-wiring occurs and they provide for electrical isolation of the load to the circuit. When the relay is relaxed the "C" Common terminal is connected to the "N/C" Normally Closed. When the relay is activated the "C" Common terminal is then connected to the "N/O" Normally Open terminal. The relays used on our circuitry contain Double contact sets indicated by section A and section B. Remember a relay is nothing more than an electrically activated switch! |
