Installation and Use Manual

Electrical Connections
5
2.3 Connecting External Circuit Breaker Alarms
Negative 48Vdc is provided to a set of alarm terminals if any circuit breaker is in the OFF position.
See Figure 5.
Figure 5 Alarm Connections
Typical
Rack PDU
Bottom View
Circuit Breaker Alarm Connector
(mating screw-type connector supplied,
wire size range 16-24 AWG,
recommended torque 1.8 in-lbs)
-48Vdc signal provided
to both terminals when
any circuit breaker is
in the OFF position.
Typical interconnections when
“daisy-chaining” multiple Rack PDUs.
-48Vdc alarm signal (out)
(to ACU+ Controller in a NetSure ITM DC UPS
or Customer Monitoring Equipment)
When used with other monitoring equipment, refer to the
instructions supplied with this equipment.
When used with a NetSure ITM DC UPS, refer to Section 6040
(NetSure ITM Installation Instructions) for circuit breaker alarm
connections to the ACU+ Controller.
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