SW31K, Voltage Monitor for undervoltage, 3 AC 690 V

Undervoltage Relay for 3-phase networks, Housing type K for switch gear cabinet mount

Undervoltage monitor for threephase networks without N for monitoring on voltage failure. The voltage is being measured between phases and an artificial neutral point. At symmetrical decrease of the voltage to approx. 50% of the nominal value or in case of failure of a phase the integrated relay (1 change-over contact) releases with a delay ofapprox. 1s. With engines runningon on 2 phases, so much back voltage can be produced that the failure of a phase may be not detected. The SW31K is available for measuring voltages AC 400 V and AC 690 V. As supply voltage in the standard version AC 230 V is needed.

Application

• Monitoring of three-phase networks on loss of a phase
• monitoring of fuses

Technical Data