Short-time and ground-fault delays are zero due to missing ZSI jumper

Was bedeutet Jumper missing for ZSI ?

If the circuit breaker is equipped for ZSI protection but the protection function is not used, a jumper must be installed. Without it, the short-time and ground-fault tripping delays will be set to zero, preventing proper discrimination.

• The required jumper for ZSI protection has not been installed.
• Circuit breaker is configured for ZSI but the function is not intended to be used.

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   Ensure the protection function is not used on circuit breakers equipped for ZSI.

2. 2

   Install a jumper to short terminals Z3, Z4, and Z5.

3. 3

   Verify the jumper is securely in place.

4. 4

   Check the trip unit settings to confirm delays are now active.