About Flex-Core Specialists in Measurement, Monitoring, Recording and Control of Current, Power and Energy. Flex-Core’s technology allows them to produce reliable, state-of-the-art products, to fit their customer's individual needs. They have built their reputation on commitment to quality products and customer service. Products Include: Split-Core Current Transformers Split-Core Clamp-On Current Transformers Solid-Core Current Transformers Potential Transformers Relays - Current Switches Current Transformer/Transducers Flex-Core is dedicated to providing the most innovative, versatile, and reliable products for today's environment.