详细介绍：

The NPM 800 relay protects high power MV and LV motors against thermal overload, too long start, locked rotor, short-circuit, underbalance, ase to earth fault.

ANSI FUNCTIONS FOR NPM 800:
49 / 50 / 51N / 37I / 46 / 48 / 51LR / 66 / 5 / 50BF / 86 / 74TC