Operating instructions / Installation instructions Please keep! Low-voltage current transformers - Divisible current transformers KBU series MBS AG Eisbachstrasse 51 74429 Sulzbach-Laufen Tel. +49 7976 9851-0 Fax. +49 7976 9851-90 info@mbs-ag.com • www.mbs-ag.
Before installation, commissioning or operation of the device, read these instructions carefully and thoroughly. 1. Safety information WARNING The following points must be noted: The applicable laws, standards and provisions. The state of the technological art at the time of installation. The rules surrounding technology. The operating instructions. The fact that operating instructions can only include general instructions and that these instructions must be observed.
2. Functional description Current transformers in the KBU series are inductive single-wire current transformers that operate on the transformer principle. They are used to adapt the primary measuring parameter to the input rated parameters of the connected measuring equipment. As a result of the measuring principle used, these current transformers are only suitable for use on alternating current networks. The KBU series is suitable for installation both on insulated and uninsulated primary conductors. 3.
. Installation During assembly, maintenance and installation work, ensure a safe working environment. If necessary, interrupt the power supply to the primary conductor and secure it against being inadvertently switched back on. Important: If the power supply is not interrupted during assembly of the primary conductor, the current transformer's secondary circuit must be closed first. Connect the measuring device or if necessary bridge the secondary connections.
4.1. Measuring circuit 4.2.
5. Maintenance and inspection Check that the secondary wires are firmly connected to the power transformer and measuring device. Check that the current transformer is properly connected. Remove any coarse dirt from the current transformer housing. Contact with moisture, especially with the core, must be avoided at all costs. 6. Troubleshooting E.g. unexpected or incorrect values, inverted power Check the settings on the measuring device using these operating instructions.
. Technical data (for exact details, see type plate) 7.1. Technical data general Input Primary rated current Ipr: Rated thermal continuous current Icth: Rated thermal short-term current Ith: Rated surge current Idyn: Rated frequency fR: See table under 7.2. 1.0 x Ipr 60 x Ipr / 1s (max. 100 kA) 2.5 x Ith 50 … 60 Hz Output Secondary rated current Isr: Accuracy class (type-dependent): Rated load Sr (type-dependent): Overcurrent limiting factor FS: 1 or 5A 0.5 ... 3 1.25 ... 30 VA FS5 ...
IEC 61869-1 EN 61869-2 IEC 61010-1 Applied standards The most recent edition of the documents specified, including all modifications, apply. 7.2. Technical data type-related KCMA -RCM-23D KCMA -RCM-58D KCMARCM-812D Primary rated current [A] 100 ... 400 250 ... 1000 250 ...
DE Hersteller Bemessungsfrequenz Primärer Bemessungsform Ipr sekundärer Bemessungsform Isr Bemessungsleistung Sr Genauigkeitsklasse Thermischer Bemessungs-Kurzzeitsstrom Ith Temperaturklasse Isolierstoffklasse Max. Betriebsspannung Um/ Bemessungsisolationspegel Typbezeichnung Überstrombegrenzungsziffer Fertigungsnummer EN Manufacturer Rated frequency Primary rated form Ipr Secondary rated form Isr Rated load Sr Accuracy class Rated thermal short-term current Ith Temperature class Insulation class Max.
8. Product Information MBS AG has been developing, producing and marketing current and voltage transformers for more than 40 years. Our customers rely on the globally renowned quality of our products. Production at MBS AG includes current transformers with closed and divided cores. During the production process, these undergo multiple checks to ensure they meet MBS AG's quality requirements.
This product was developed and produced in accordance with the applicable standards (IEC 61010, IEC 61869) and complies with the requirements of the Low Voltage Directive 2014/35/EU. MBS AG hereby declares that it only uses components from qualified manufacturers in its products, the specifications of which satisfy or exceed the requirements of the EU directive on the restricted use of certain hazardous substances.
