Undervoltage Relay, 3-phase IK 9171 Monitoring of voltage systems on undervoltage. Automatic switching to emergency supply or of emergency light in the case of phase loss according to DIN VDE 0100-710 or DIN VDE 0108. Features . According to IEC/EN 60255-1 . Monitoring of undervoltage in 3-phase system . Also for single phase . Without auxiliary supply . Optionally for 3p3w systems . LED indicator for state of output relay . Independent of phase sequence . 1 or 2 changeover contacts . Optionally fixed or settable response value . As option with phase sequence detection . Optionally with or without N . Optionally with off-delay t1 . Opionally with on delay t2 . Devices available in 2 enclosure versions: I-model: depth 59 mm, with terminals at the bottom for installation systems and industrial distribution systems according to DIN 43 880 S-model: depth 98 mm, with terminals at the top for cabinets with mounting plate and cable duct . Width: IK 9171, SK 9171: 17.5 mm IL 9171, SL 9171: 35 mm Technical specifications Width: 17,5mm Operate delay: Yes Enclosure design: Distribution board 1- / 3-phase: 3, 1 Output contacts: 1 C/O contact Auxiliary voltage: Without Type: IK 9171 Nominal voltage max.: 3/N AC 500/290V Manufacturer: E. Dold & Söhne GmbH & Co. KG Type: IK9171.11/240 3/N AC380/220V 0,75UN Art. No.: 0047644