Juniper SRX5800 Hardware Manual page 42

Table 10: Alarm Relay Contact Functions
Contact Label Contact Name
NC Normally Closed
C Current In
NO Normally Open
Table 11 on page 43 shows the electrical specifications for the alarm relay contacts.
Table 11: Alarm Relay Contact Electrical Specifications
Maximum Voltage
Maximum Current
Figure 8 on page 43 shows an example wiring diagram for a simple alarm reporting device. In this case the
device is a 12-volt light bulb that illuminates when the device encounters a condition that activates the
major alarm LED and relay contacts. The alarm relay contacts can also be used to activate other devices
such as bells or buzzers.
Figure 8: Example Alarm Reporting Device
Function
Connects the alarm relay to an external alarm-reporting device that
activates when the circuit between C and NC is closed.
Connects the alarm relay to the current source for the external
alarm-reporting device.
Connects the alarm relay to an external alarm-reporting device that
activates when the circuit between C and NC is open.
Current Type
AC
250
8 A
DC
30
43