Alarm Output on Hikvision NVR... How to connect to siren/light???

[eggsan]

I will not put at risk my main device, but use instead a separate relay to trigger the siren. Since most sirens are 12 volts, the nvr relay output will only complete the circuit to activate the coil (say a 12V automotive relay), while the secondary relay will handle the extra load (siren)

 

[KamirZG]

Don't know what outdoor siren you are using. You should see tech spec of your siren for power.

If you use 12V-2A you can triger siren via DVR/NVR.

+ from power goes directly to siren + , - from power go to COM and Output from DVR/NVR goes to - on siren. That should work.