Power Transformer S-M-30~2500/10 1.IEC standard 2.High efficiency,low loss, ... 2) Maximal ambient temperature: +40.C3) Maximal daily average temperature: +30.C4) Maximal annual average temperature: +20.C5) Minimal ambient temperature ... electrical equipments and components in China, exsiting for more than 30 years. With stength of power transformer, substation, switchgears, circuit breaker ...