Type designation: STS 51Summary current transformer for 2 unequal primary transformers with low powerPrimary transformer 1: ...../1 APrimary transformer 2: ...../1 A Primary transformer 3: ...../1 APrimary transformer 4: ...../1 A Primary transformer 5: ...../1 A Class 1Power 0.2 VAInstallation location: IndoorsAmbient temperature: - 5°C ...... + 55 °CRel. Humidity: 5%... 85%, no condensationProtection class IP 20Standard: IEC 61010-1, IEC 61010-2-030 /2010Application conditions: IEC 60044-1/2003Rated thermal short-time current: Ith 60 x In / 1sContinuous thermal current 100%Rated insulation level: 0.72/3/-kVRated frequency: 50/60 HzInsulation class E (120 °C)Primary and secondary cable max. 1.5 mm²