Schneider Electric IMDIM400THR Monitoring relay

This device belongs to the Vigilohm series, which was developed for the monitoring of ungrounded power supplies (IT systems) according to the installation and product standards. According to the standards, it is recommended to equip your systems with insulation monitoring devices (IMD). This equipment is intended for monitoring medium-voltage AC equipment when connected to accessories P1N and DC-DC converter. It measures the line insulation resistance by feeding a DC current between the mains and the ground. The configuration depends on the installation. The settings are made on the front of the device via the HMI screen. The settings refer to the alarm and pre-alarm thresholds, the alarm delay from 0 to 7200 seconds, and others are available. The black-and-white screen can display insulation resistances from 10 ohms to 10 megohms and temporary errors. Autotest starts automatically every 5 hours and if necessary. If the insulation resistance of the system falls below the set threshold, WAS means that a ground fault has occurred, an alarm is triggered via the IMD output relay. As soon as no more faults are detected, the alarm is cleared and the alarm relay returns to its normal state. The device can be supplied from a 110VAC to 440VAC source or from a 110VDC to 440VDC source, all with a tolerance of plus or minus 15%. This product is flush-mounted, e.g. into a control cabinet door. Front-side protection class is IP5, rear-side protection class IP20 and over-voltage 300V category III. The monitoring device is equipped with an RS485 communication interface with Modbus protocol.

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