Time delay for under voltage release is not available for LF range circuit breaker.

LF uses RI operating mechanism with its own auxiliaries. Until now, this function does not find with the RI operating mechanism, so the LF does not have this function. The time delay is available only for the Evolis 17.5 kV with the proxima operating mechanism.
Evolis 17.5KV uses this function with undervoltage release from masterpact circuit breaker range.