Gossen Metrawatt Current Transformers 619453 - Gossen Metrawatt U518C, The Gossen Metrawatt SC40-B current transformer converts a primary current of 250 A to a secondary current of 5 A with 0.5 VA capacity at class 1 accuracy. Its compact 18 mm design is ideal for retrofitting and measuring alternating current in existing electrical installations. This measurement converter is typically used for accurate current monitoring in industrial and commercial applications. Gossen Metrawatt U518C SC40-B Transformer 250/5A Compact Cable Design