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Zelio Control. This mains monitoring relay monitors three-phase mains (380-480 VAC) for phase sequence, phase failure and phase asymmetry (5-15%). Two relay changers are provided for signalling, which can be loaded up to 8 A. The limit value for the asymmetry and a switch-off delay for the output can be set. The settings are made via operating elements in the front, which can be protected against changes under a transparent cover. With an illuminated scale arrow, the setting of the potentiometers can be seen very clearly even from a distance. The diagnostic switch on the front allows the output relays to be switched off for testing the entire application. When the transparent cover is closed, the diagnostic switch is automatically reset. Three LEDs indicate the status. The construction width is 22.5 mm and mounting is on the top-hat rail. Power is supplied from the measuring circuit. The cable connection is made via screw terminals.
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