Meaning of Legend / Labels at Terminals of Merlin Gerin Auxillary Control Unt ACP

helo everyone

Can anyone please urgently clarify what is the interpretation of the terminal Nos., labelled "24", "N", "O,, "L,"R","E" and "25" in the auxillary control unit ACP of merlin gerin make used in the auto source changeover system. From the available catalogue I am able to observe that I have to apply the voltage inputs (of normal source and replacement source) at the terminals of the circuit breakers. But i am not able to understand what is the voltage to be checked at the out put terminals with the above mentioned legend / labels.Please some one help me urgently