Siemens 8dn9

Siemens has not left the 8DN9 in the analog age. Modern deliveries integrate:

Use the diagram logic (mentally or draw it): siemens 8dn9

If the busbar 1 gas pressure drops → only busbar 1 is opened, rest of switchgear keeps running. Siemens has not left the 8DN9 in the analog age

Quiz:
Q: Where would you place the circuit breaker’s own gas monitoring sensor?
A: On the breaker chamber, obviously – but clever trick: It shares with the breaker’s local disconnector if space is tight, but not with busbar for reliability. If the busbar 1 gas pressure drops →

Due to its compact size and reliability, the 8DN9 is ideal for: