BLOCK Transformatoren-Elektronik GmbH develops, manufactures, tests, and markets transformers, reactors, power supplies, and electrical filters. The company offers mains, control, isolating, isolating, interference suppressing, safety, lighting, auto, toroidal, variable, 100-V-line, low profile, and PCB transformers; primary switched power supplies, electronic fuses, redundant modules, buffer modules, uninterruptible power supplies, accumulator modules, DC/DC transformers, linear stabilized power supplies, and not stabilized power supplies; line reactors, harmonic circuit filter reactors, harmonic filters, radio interference suppression filters, stabilizers, sinosuidal filters, and motor reactors; and special devices/accessories. Its products also include inrush current limiters, energy-saving systems, test and measurement instruments, winding wires, and enclosures. The company also provides mechanical engineering, renewable energy, lighting technology, building service engineering, apparatus engineering, and drive engineering solutions; and EMC testing and consultancy services. It offers its products through distributors worldwide. The company was founded in 1939 and is based in Verden, Germany with additional operations in Belgium, China, Denmark, France, Great Britain, and the United States. BLOCK Transformatoren-Elektronik GmbH operates as a subsidiary of Block Holdings Ltd. and UK Land Estates Limited.