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TEU 400 is a family of high reliability electronic protection relays for protection of various types of electric MV/LV loads like feeder cables, three-phase motors and power transformers which require thermal overload protection and, single, two or three-phase overcurrent or non-directional earth-fault protection.

The relay is based on a microprocessor environment with a real-time embedded operating system that continuously monitors the operation of the relay and the protected equipment. The HMI includes a liquid crystal display (LCD) which makes the installation and configuration of the relay safe and easy.

Local control of the relay via serial communication can be carried out with a computer connected to the front communication port or wirelessly by Bluetooth using an Android application.

Both DIN rail mount or panel mount are possible.