Eaton LGH breaker trip unit

[OCPD]

Hello,
Why does the Eaton breaker have tsd = Inst (J K L), 120 ms (M N O), 300 ms (P Q R). What do these letters mean and there are three notches on the breaker as well. I am pretty sure it has significance not sure what. Is it something to do with tolerance?

 

[Julius Right]

In my opinion, the circuit breaker Eaton LSIG- for instance- is provided with two short-delay possibility: one for short-circuit between phases [tsd] and one for phase to ground [tg].The letters on the selector indicate the delay combination of these.
Let's say for tsd=inst. [instantaneous] between phases and tg=300 ms delay for ground fault the L position has to be selected. See:
file:///C:/Users/user/Downloads/TD012019EN.pdf

 

[OCPD]

In my opinion, the circuit breaker Eaton LSIG- for instance- is provided with two short-delay possibility: one for short-circuit between phases [tsd] and one for phase to ground [tg].The letters on the selector indicate the delay combination of these.
Let's say for tsd=inst. [instantaneous] between phases and tg=300 ms delay for ground fault the L position has to be selected. See:
file:///C:/Users/user/Downloads/TD012019EN.pdf

Thank you.

 

[Ingenieur]

In my opinion, the circuit breaker Eaton LSIG- for instance- is provided with two short-delay possibility: one for short-circuit between phases [tsd] and one for phase to ground [tg].The letters on the selector indicate the delay combination of these.
Let's say for tsd=inst. [instantaneous] between phases and tg=300 ms delay for ground fault the L position has to be selected. See:
file:///C:/Users/user/Downloads/TD012019EN.pdf

Exactly :thumbsup: