In Service - Gewiss GW 90 836 Handbuch

The local command buttons (figure A) are used to perform the ON/OFF cyclical switching,
inverting the relay status each time they are pressed. Local commands are not executed
if a priority command is active.
WARNING: the local command buttons are enabled only when the BUS power
is available.
Behaviour on the failure and return
If the power to the bus decreases below 18 V dc for over 1.5 ms the relays switch to OFF.
When the power is reinstated on the bus, the relay remains in OFF mode.
This device requires no maintenance. Use a dry cloth for possible cleaning.

IN SERVICE

Using the local command buttons
of the bus power supply
Maintenance
24