The rotor indicator and fluid indicator are mechanical short-circuit indicators which are designed to detect short-circuit currents in medium voltage distribution networks.
The indicators are tripped by a magnetic field strength "H" which is induced by trip values I>>.
Rotor indicator: The pivoted rotor with reset pin uses a two-colour indication to inform the user of the state of the rotor indicator. “Black” means that the indicator has not been tripped whereas “red” indicates that the indicator has been tripped.
Fluid indicator: When a short-circuit occurs, the mixer is pulled up by the magnetic field stirring up red particles in the fluid. The indication resets automatically after six to eight hours once the red particles have set to the bottom of the mixer.
