Detection of overvoltage, undervoltage and phase failure, mains fault diagnosis by several LEDs, response values for overvoltage and undervoltage can be set separately, large setting ranges 0.9 ... 1.3 UN or 0.7 ... 1.1 UN, adjustable time delay from 0.1 ... 20 s, closed-circuit principle, without auxiliary voltage, phase sequence as desired, can also be used with 1 phase, 2 changeover contacts, with IP/SP 9077 2 x 2 changeover contacts, optionally with asymmetry detection, optionally with phase sequence detection, optionally without N connection, devices optionally in 2 designs: I design: 59 mm depth and connection terminals at the bottom for installation and industrial distributors in accordance with DIN 43 880 S design: 98 mm depth and connection terminals at the top for control cabinets with mounting plate and cable duct
