VME420 relays equivalent, multi-functional monitoring relays.
* Monitoring AC/DC systems for undervoltage, overvoltage and frequency in the voltage range of 0…300 V Different monit oring func tions selec table < U, > U or < U/> .
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VME420
3.1
-phase voltage and frequency monitoring of machines and electrical installat.
The voltage relays of the VME420 series are designed to monitor the frequency, undervoltage, overvoltage and the voltage between two threshold values (window discriminator function) in AC and DC systems. The voltages are measured as r.m.s. values. Th.
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