Operating Manual / Installation Guide Low Voltage-Current Transformer Model Range CTB Measurement ranges: Primary current: 50 up to 2500A AC Secondary current: 1A or 5A Functional Description Isolation Characteristics Current transformers of the CTB model range are inductive, single-conductor current transformers operating according to the transformer principle. Due to the applied measuring principle, current transformers of this type may only be installed in alternating current (AC) networks. Maximum voltage for electrical utilities: 1,2 kV, Ueff (maximum phase-phase-voltage) In accordance with IEC 61010-1 under condition of: Overvoltage category III Pollution degree 2 Heterogeneous electrical field Rated power frequency withstand voltage (Isolation test voltage primary conductor against measuring output: 6 kV, Ueff, 50 Hz, 1 min. UL-housing classification: UL94-V0 In order to avoid personal and material damage the following assembling steps must be performed by qualified and trained personnel only. If the secondary circuit is operated without a burden/load (open) high voltages may appear. These voltage values are dangerous for persons as well as for the functional reliability of the current transformer. It is forbidden to operate the current transformer without a secondary circuit (open)! Accessory: Quick-fix Technical Parameters Indication: Before initial operation we ask you to pay full attention to these assembling instructions in order to guarantee the reliability and to ensure the performance of the device. Please see an updated version of this datasheet on our homepage www.mbs-ag.com. MBS AG Eisbachstraße 51 74429 Sulzbach-Laufen Tel. +49 7976 9851-0 Fax. +49 7976 9851- 90 Primary rated current: Secondary rated current: Accuracy class: Over current limiting factor: (see name plate) Rated frequency: Rated thermal continuous current Id: Rated thermal short-time current Ith: Operating temperature range: Storage temperature range: Connection clamps: Applied standards: File no. of UL-approval: 50 … 2500 A AC 5A or 1A 1 FS5 / FS10 50 / 60Hz Environmental Instruktion 1,2 x In When the product has reached its “end of life“, it must be recycled. Please pass it to an electrical waste disposal. Do not dispose as unsorted municipal waste! 60 x In, (max. 100 kA), 1 s -5°C ≤ ϑ ≤ +50°C (0…95% relative humidity, non condensing! -25°C ≤ ϑ ≤ +70°C WAGO Cage-Clamp max. 4,0 mm² DIN EN 60044-1 (12/2003) VDE 0414-1 (12/2003) E336996 (2010) This product was developed and manufactured in accordance with the applicable regulations (IEC 61010, IEC 61869) and meets the requirements of the low voltage guideline 2006/95/EG Assembly 1. 2. 3. 4. 5. 6. Mount the current transformer on the primary conductor by directing the primary conductor (copper bus bar respectively round conductor) through the window opening of the current transformer housing. The device can be fixed either directly on the primary conductor or on a ground plate. A mounting kit is part of the delivery. It contains plastite-screws, red isolation covers and foot angles. On each side of the housing are swells with threaded holes. The device can be fixed directly on the bus bars by usage of the plastite-screws (see photo on the left). If the device is to be mounted on a ground plate, the foot angles are to be used. Current transformer types CTB31.35 and CTB 41.35 can also be mounted on a 35mm-DIN-hat rail by using a snap-on mounting (accessory, article-no.: 50.2.8095). Connect the conductors according to the drawings . Please see the pictograph on the bottom of the next page (CageClamp) for the correct mounting of the secondary terminal clamps.