Phase sequence indicators allow to determinate the phase sequence in a 3-phase network. They use an electric circuit, without moving parts. When the instrument is connected, if the phase-sequence is correct a grenn light shices. Otherwise, a red light does.
– ISE72n/1 and ISE96n/1: Indicators for panel mounting are suited for permanet connections at voltages between 150 and 600V.
– ISE 96s/2: Indicator for panel mounting. It also incorporates a change-over relay, with potential-free output contacts. When the sequence is not correct or the instrument is disconnected, the relay de-energizes (closed circuit principle). Thus, an alarm can be triggered or any corrective action can be taken.