Juniper SRX 5800, Hardware Manual

Page: 42 / 536

Table 10: Alarm Relay Contact Functions
Function Contact Name Contact Label
Connects the alarm relay to an external alarm-reporting device that
activates when the circuit between C and NC is closed.
Normally Closed NC
Connects the alarm relay to the current source for the external
alarm-reporting device.
Current In C
Connects the alarm relay to an external alarm-reporting device that
activates when the circuit between C and NC is open.
Normally Open NO
Table 11 on page 43 shows the electrical specifications for the alarm relay contacts.
Table 11: Alarm Relay Contact Electrical Specifications
Current Type
DC AC
30 250 Maximum Voltage
8 A 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
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