Carlo Gavazzi Monitoring Relay 3-Phase-Neutral Max. and Min. Voltage, S Housing, Plug-In, SPDT, Supply: 415VAC
3-phase and neutral monitoring plug-in relay for separate upper and lower voltage control. Often used to control all 3 phases and neutral where the supplied electrical poweris unstable or varies in value in order to monitor that the attached motors are performing as required. The S 1721 features built-in time delay.
General Characteristics
Monitoring relay for 3-phase upper/lower phase-phase neutral voltage control
Measures if all 3 phase-neutral voltages are within set limits