Molded Case Feedthrough Current Transformer
The measured phase (conductor rail or line) is fed through the CT window, forming the primary circuit for the current transformer. Feedthrough transformers are primarily used for mounting on busbars. Through additional potting, it is possible to achieve droplet-tightness as well as enhanced shock and vibration resistance with mechanical loading (IEC 68). This is the most common type of current transformer. It is typically used in new system installations because the primary conductor must be interrupted during installation.
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Split-Core Current Transformer
Split-core current transformers are often used in retrofit applications. These transformers have an open core ready for installation. Fitted around the busbars, installation can proceed without interrupting the primary conductor.
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Fig.: Split-core current transformer
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Cable-Type Split-Core Current Transformer
Cable-type split-core current transformers are exclusively suited for installation in isolated primary circuit conductors (supply cables) in weatherproof and dry locations. Installation can be done without interrupting the primary conductor (i.e., while operation is ongoing).
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Fig.: Cable-type split-core current transformer
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DIN Rail Current Transformer with Voltage Tap and Fuse
The DIN rail current transformer is a unique, highly-compact variant with integrated voltage tap. It includes a terminal strip, current transformer and the voltage tap terminal with fuse. The fuse is fitted directly on the primary conductor. Therefore, the unprotected part of the measurement line is very short, ensuring a high degree of intrinsic safety.
The DIN rail current transformer is simple to wire, resulting in low installation costs, and offers high reliability due to fewer connections. It is also space-efficient and exhibits very few connection faults.
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Fig.: DIN rail current transformer