Vertiv™ NetSure™ -48 VDC Battery Rack System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
6
5.5
Battery Disconnect Circuit Breakers External Alarm Connections
The battery disconnect circuit breakers are factory wired to an alarm card located at the top of the box framework. The alarm card
provides resistive battery and Form-C relay contacts for connection to external alarm circuits.
If any battery disconnect circuit breaker is in the OFF position, resistive battery is provided at terminal 1 of J3 on the alarm card. Also,
relay contacts open between terminals 2 and 3 of J3 and close between terminals 3 and 4 of J3 located on the alarm card. Refer to
Figure 5.2.
Figure 5.2
Battery Disconnect Circuit Breaker Alarm Card
Front shield and portion
of rack removed for
clarity only.
Front
Notes:
Relay shown in deenergized state.
Relay energizes during alarm condition.
N.O. (Normally Open Contact)
Com. (Common)
N.C. (Normally Closed Contact)
Terminal Block (J3) accepts a wire size in
the range of 26 AWG to 14 AWG (solid or
stranded). Recommended Torque (J3):
4.4 to 5.3 in-lbs.
Alarm Card
Resistive
Battery
N.C.
N.O.
Com.
J3
1
2
3
4
