Appendix A: Panel specifications 
186  P/N 3102351-EN • REV 005 • ISS 28DEC18 
Control panel specifications 
VS1 panel  VS4 panel 
  1 loop Class B, Class A, or Class X 
supporting up to 64 device addresses 
(any combination of detectors and 
modules) 
Maximum T-taps: 63 (each device can 
be on its own branch) 
1 loop, expandable to 4, Class A, Class 
B, or Class X. E
ach loop supporting up to 
250 device addresses (125 detectors and 
125 modules max.). Addresses 1 to 125 
are for detectors and addresses 126 to 
250 are for modules. 
Maximum T-taps: 124 
Notification appliance 
circuits
 
2 Class B, Class A optional 
3.75 A FWR total at 120/230 VAC 60 Hz 
3.0 A FWR total at 230 VAC 50 Hz 
2.5 A FWR each max. per circuit 
4 Class B or 2 Class A  
6.0 A FWR total at 120/230 VAC 
60 Hz 
5.0 A FWR total at 230 VAC 50 Hz 
2.5 A FWR each max. per circuit 
  120 VAC, 60 Hz, 1.3 A max. 
230 VAC, 50-60 Hz, 0.62 A max. 
120 VAC, 60 Hz, 2.0 A max. 
230 VAC, 50-60 Hz, 0.97 A max. 
Base panel current standby
  155 mA  172 mA 
panel current alarm  204 mA  267 mA 
  16 max.  32 max. 
  8 drops max., RS-485 Class B,  
Class A is optional 
Data line length: 4,000 ft. 
(1,219 m) 
8 drops max., RS-485 Class A or B 
Data line length: 4,000 ft. (1,219 m) 
voltage  24 VDC panel 
Auxiliary power output 
circuit
 
AUX 1 power: 500 mA (standby), 24 VDC. Up to 1000 mA of alarm current is 
available on AUX 1 if you reduce the total available control panel NACs alarm 
current by the amount of AUX 1 + AUX 2 alarm current over 500 mA ) 
AUX 2 power: 500 mA (standby and alarm), 24 VDC (resettable) 
AUX 1 + AUX 2: Total maximum standby current = 500 mA  
AUX 1 + AUX 2: Total maximum alarm current = 500 mA; (1000 mA is available if 
you reduce the total available control panel NACs alarm current by the amount of 
AUX 1 + AUX 2 alarm current over 500 mA) 
Output: 28.3 to 21.9 VDC, special application 
Note: For a complete list of devices that can be connected to this circuit, see the 
VS1 and VS4 Series Compatibility List (P/N 3102354-EN).