Juniper SRX5400 Hardware Manual page 39

interface, the alarm relay contacts are also activated. The alarm relay contacts are located on the upper
right of the craft interface.
Figure 5: Alarm Relay Contacts
The alarm relay contacts consist of two sets of connectors, one set for each of the two alarms (major and
minor). For each alarm color there are three connectors.
the connectors.
Table 11: Alarm Relay Contact Functions
Contact Label Contact Name
NC Normally Closed
C Current In
NO Normally Open
Table 12 on page 40 shows the electrical specifications for the alarm relay contacts.
Table 12: Alarm Relay Contact Electrical Specifications
Maximum Voltage
Maximum Current
Figure 6 on page 41 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.
Table 11 on page 40
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
describes the functions of
DC
30
40