ABB 6550-500 Manual De Instrucciones página 33

Fields of Application
Extensions
The following can be used as extensions:
– Normally-open contact button, e.g. 2020US
(Switching/dimming possible via extension unit button.
If a Busch watchdog attachment is used with the
6550U-10x-500, only switching is possible)
– Flush-mounted (FM) Insert 6805U-500 in conjunction
with Busch Watchdog
®
180° Sensors (s. page 54)
ENG 33