Circuitus interruptoris VD4-12 mola-operatus, circuitus signali

SFA:commutator conversus
SFB:botto commutationis
QF:Interruptor aereus directi currentis
QC:Commutator terrae
WCC:Centrum Connectionis Filorum
V:Pontifex rectificans
Interior arcuae dividitur in interior currui interruptoris