The TKR series current transformers are inductive, single-conductor current transformers operating on the transformer principle. They are designed to adapt the primary measurement value to the input rated values of the connected measuring devices. Due to the applied measurement principle, these current transformers are suitable for exclusive use in alternating current networks. The TK series is only suitable for installation on insulated primary conductors. Current transformers for low-voltage systems (DIN EN 60044/1, DIN 42600, DIN VDE 0414/1), suitable for retrofitting without opening the conductor circuit, the housing can be opened via a plastic joint, frequency of 50 to 60 Hz, for secondary currents of 5 A, operating voltage up to 720 V, accuracy class 1 in accordance with IEC 1036, temperature range from -5 to +50 °C, for installation on cable lines, unbreakable plastic housing made of gray polyamide, flame retardant, insulation test: 3 kV Ueff, 50 Hz, 1 min, with a fixed connection cable of 0.50 m length and 1.5 mm². Technical data for TKR 32: Primary current up to 250 A, secondary current 5 A, internal dimensions (H x W) Ø 32.5 mm, external dimensions (H x W) 96.4 x 59.2 mm, fixed connection 0.50 m, Ø 1.5 mm², brown S1 - blue S2, depth (D) 89.2 mm, accuracy class 3, burden 3 VA.