Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 12 Page 38 of 265
maximum number of each type of detector that can be supported by each type of
transformer is shown in the table below.
Note
In the ST900 controller, the MDU is not used to power any Loop
Detector Cards.
667/1/
27853
/00
0
50VA / 2.0A
667/1/
20292
/00
8
160VA
/ 6.6A
Siemens ST4R/ST4S
(2.4W / 100mA per detector)
20 66
Sarasota MTS36Z or MTS38Z (or any mix)
(3W / 125mA per detector)
16 53
Microsense Detectors
(6W / 250mA per detector)
8 26
Table 6 – ST900 Detector PSU Selection
Kit Part Number Rating (VA) Current
667/1/33075/000 50VA 2.0A
667/1/33074/000 160VA 6.6A