This modular current transformer has a current ratio of 40/5 and an accuracy class of 3 at 1 VA. It has been tested at a voltage of 3 kV with a frequency of 50 Hz for one minute, and it has an insulation class of E (120 deg C). The transformer is equipped with a sealable cover for the secondary terminals. Its housing material is made of self-extinguishing thermoplastic resin V0. The dimensions of the TRFM type are 85.5Hx52.5Wx58D mm, with a cable diameter opening of 29 mm. This transformer can be easily adapted to various mounting systems, including primary cable, primary busbar, DIN rail, and wall-mounting.