a small transformer used to supply circuits requiring special protective measures. The windings are arranged to minimize the voltage between any conductor which might become exposed and earth., isolating transformer - a transformer inserted in a system to separate one section of the system from undesired influences of the other sections., ... kasutatakse elektritarvitite käsitsemisohutust tagavaks galvaaniliseks eraldamiseks toitevõrgust (eraldustrafo)