Chapter 1: Installation and wiring 
P/N 3102351-EN • REV 005 • ISS 28DEC18  7 
Caution: The middle connection (EARTH GND) on the terminal block makes a mechanical 
connection to the chassis even with the ground wire removed. 
Terminate the incoming AC power wiring as shown in Figure 5.  
Figure 5: AC power wiring 
 
2)  Earth ground 
(3)  Neutral (120 VAC), Line (230 VAC) 
(4)  5 A, 250 V, SLO-BLO (Littelfuse  
P/N 2450005) 
(5)  120 or 230 VAC primary power connection 
Note: See “Component descriptions” on page 138 for the location of the wiring block in the 
backbox. 
Panel transformer wiring 
WARNING: Electrocution hazard. To avoid personal injury or death from electrocution, remove 
all sources of power and allow stored energy to discharge before installing or removing 
equipment. 
Incoming power circuit specifications 
•  VS1 panel: 120 V, 60 Hz, 1.3 A or 230 V, 50/60 Hz, 
0.62 A from dedicated branch supply 
•  VS4 panel: 120 V, 60 Hz, 2.0 A or 230 V, 50/60 Hz, 
0.97 A from dedicated branch supply 
Low voltage circuit specifications 
•  Circuit voltage: 24 VAC 
•  All circuits are power-limited unless otherwise noted 
Terminate the primary and secondary transformer wiring as shown in Figure 6 and Figure 7.