Description   
2.4 ETU300 electronic trip unit 
  3WA1 air circuit breaker 
86  Equipment Manual, 02/2023, 92310000002-06 
2.4.4.3  Parameter DAS+ maintenance mode 
 
2.4.5  DAS+ maintenance mode 
The DAS+ maintenance mode can be activated for the ETU300 electronic trip unit via 
the digital ETU input. The input signal must have the signal state HIGH for this purpose.  
The activated DAS+ maintenance mode is indicated by the blue DAS+ LED on the 
ETU300. 
The digital ETU output of the circuit breaker is set when the DAS+ maintenance mode is 
switched on. 
The connection is made at the secondary disconnect terminal system of the 3WA air 
circuit breaker.