Frequency Relay IK 9143 Frequency monitoring function in in-plant generation units and local power supply systems. Advantages . Easy setting . Without auxiliary voltage Features . According to IEC/EN 60255-1 . Monitoring of overfrequency and underfrequency (selectable) in A.C. power systems . Selection of frequency range for 50 or 60 Hz systems . Adjustable response value . Adjustable hysteresis . De-energized on trip (output relay not activated in case of error) . LED indicators for measuring voltage and contact position . 1 changeover contact . As option energized on trip (output relay activated in case of error) . Devices available in 2 enclosure versions: IK 9143: depth 58 mm, with terminals at the bottom for installation systems and industrial distribution systems according to DIN 43 880 SK 9143: depth 98 mm, with terminals at the top for cabinets with mounting plate and cable duct . 17.5 mm width Technical specifications Width: 17,5mm Operate delay: Yes Enclosure design: Distribution board 1- / 3-phase: 1 Standard measuring range: 50/60 Hz Measuring range max.: 50/60 Hz Output contacts: 1 C/O contact Auxiliary voltage required: Yes Type: IK 9143 Manufacturer: E. Dold & Söhne GmbH & Co. KG Type: IK9143.11 AC50/60HZ +/-10% 230V Art. No.: 0055922