521 / M531 Full Protection Box 230v / 380V Protection functions- Over load protection- Pump stalled protection- Dry run protection with sensor free- Under voltage protection- Over voltage protection- Open phase protection Application & Control characteristic 0.37kw - 2.2kw 230v 0.37kw - 3kw 380v 4kw - 7.5kw 380v- Control and protect universal pump- Adapting liquid probe or float switch or pressure switch to control pump start and stop- 25C - +55C- IP22- Wall mounting (228 x 160 x 82mm) Other Features- Push button calibration- Memory function when the power off and recover - LCD screen displaying pump running status- Signal transmission distance up to 200m Additional capacitors for 230v control box will be supplied Feed water / Water transfer Mode Start Stop