A dry contact can report whether an external switch or alarm circuit is open or closed. It might monitor a door, pump fault, mains-failure relay, float switch or equipment alarm. A relay output can provide a controlled contact to reset a device, trigger an alarm input, switch an interface relay or operate another low-power control circuit.
The router should not directly switch loads beyond its rated output. Pumps, motors, locks and higher-voltage circuits normally require suitable contactors, relays and electrical protection. Define the safe state if the router loses power or communications, and have a qualified person design the physical control where required.
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What practical jobs can dry contacts and relay outputs perform in a remote connectivity installation?
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