Depends on what is being ordered; SS can stand for either the "Signal Switch" or the "Silk Screen" push bar.
The SS (Signal Switch) and ALK (Exit Alarm) sit in the same location in the exit devi...
The PS9 power supply was discontinued. The new exit alarm ALK can either use a 9VDC battery or 24VDC regulated power supply.
There is no direct replacement for Von Duprin PS9 power supply.
Cur...
The Von Duprin exit alarm ALK shipped after November 2010 are new style boards and can be identified by the 3 terminal blocks and LED. Only these ALK will work with 24vdc power supply.
The standard exit alarm ALK devices are not available with dogging option.
The device can be ordered through Engineering Special with dogging option on non fire exit devices.
This special is o...